Smart Contract Development
We design modular, upgradeable smart contracts in Solidity, Rust, and Move - built for auditability, gas optimisation, and multi-chain deployment from day one.
Our Services
Smart Contract Development & Audits
Contracts engineered for clarity, testability, and external review with operational safeguards from day one.
250+
Contracts deployed across EVM networks
$2.4B+
TVL secured at peak
150+
Audits coordinated
8+
Years of experience
Our services
Smart Contract Development Services
Nine smart contract disciplines - from core development and security audits to DEX infrastructure, RWA tokenization, and DAO governance - each scoped independently and engineered to production standards on EVM and non-EVM networks.
Next step
Ready to scope your smart contract programme?
Share your chain, timeline, and constraints - we respond within one business day with a scoped recommendation, not a sales pitch.
Delivery scope
Six deliverables, zero ambiguity.
Every engagement produces a defined artifact set. Scope is agreed upfront; nothing is a billable surprise.
01
Solidity & toolchain selection
Compiler version, inheritance patterns, and testing harness chosen to your risk profile.
02
Threat modelling aligned to asset flows
Attack surface documented before a line of production code is written.
03
Property-based & differential testing
Invariant suites via Echidna or Foundry fuzzing, not just unit coverage.
04
Gas & failure-mode analysis
Every function profiled; revert paths documented with recovery playbooks.
05
Deployment & verification pipelines
Deterministic deploys, Etherscan verification, and multisig ceremony scripts.
06
Audit preparation packs & fix cycles
Findings addressed with root-cause fixes and regression coverage before sign-off.
Tooling stack
Our Smart Contract Development Technology Stack
Chosen for auditability, community support, and production track record.
Default stack
Solidity · Foundry · Hardhat · OpenZeppelin · Chainlink
Programming languages
Solidity
EVM chains
Rust
Solana, Polkadot, Near
Move
Aptos & Sui
Vyper
Python-like Ethereum
Go (Golang)
Blockchain clients
C++
EOS, legacy chains
JavaScript
dApp frontend
TypeScript
Typed Web3 standard
Python
Scripting & testing
Cairo
StarkNet contracts
Frameworks & dev environments
Hardhat
Ethereum dev env
Foundry
Rust-based toolkit
viem
Type-safe Ethereum library
Remix IDE
Browser-based IDE
Brownie
Python framework
Anchor
Solana framework
Aptos Framework
Move-based dev
Scaffold-ETH
Full-stack starter
Embark
Full-stack dApps
Forge
Foundry test runner & tooling
Databases & storage
Arweave
Permanent storage
Filecoin
Decentralised market
IPFS
Distributed protocol
Storj
Encrypted cloud
Sia
Low-cost network
BTFS
BitTorrent storage
Crust Network
IPFS incentive layer
OrbitDB
P2P on IPFS
Ceramic
Decentralised streams
Tableland
SQL-like Web3 DB
Tools & infrastructure
Ethers.js
Ethereum JS library
Web3.js
Legacy ETH library
Alchemy
Blockchain API
Infura
ETH/IPFS infra
The Graph
Indexing protocol
Moralis
Web3 BaaS
Chainlink
Oracle network
Tenderly
Debug & monitor
OpenZeppelin
Secure libraries
Slither
Static analysis tool
MetaMask
Wallet & dApp UX
Trust & diligence
Audit Partner Ecosystem
We coordinate preparation and remediation with recognised third-party audit firms your stakeholders already trust - a strong signal for investors, listings, and users.
Third-party names and marks belong to their respective owners.
Partner with us
Built for Teams Who Can't Afford to Get It Wrong.
Smart contracts are financial infrastructure. A single exploited vulnerability can drain liquidity, collapse protocol trust, and end a product. We build for the teams who understand that with invariant testing, third-party audit coordination, and deployment pipelines that leave no ambiguity in the handoff.
Why Bitronix
What Makes Bitronix Different From Every Other Smart Contract Firm.
Not a feature list. Six specific reasons clients who've worked with other firms come back to us - and stay.
01
Audit-First Engineering
We write contracts for external reviewers, not just for deployment. Every function is documented, every invariant is encoded, and every attack surface is mapped before a single line goes to audit - cutting review time and findings count on every engagement.
02
No Black-Box Development
You see every architectural decision, every test result, and every threat model output as we build. No end-of-sprint surprises. Enterprise clients get a live documentation trail they can hand to their own security team or board at any point in the engagement.
03
Chain-Agnostic Execution
We work across EVM networks, Solana, Aptos, Sui, and StarkNet - not because we list them in a brochure, but because our case studies are deployed across them. Chain selection is driven by your requirements, not our tooling comfort zone.
04
Remediations Included, Not Billed Separately
Audit findings are part of the engagement, not a change order. We triage, fix, and regression-test every finding through to auditor sign-off without renegotiating scope. You know the full cost before we start.
05
Post-Launch Operational Coverage
Most firms disappear after deployment. We provide on-chain monitoring via Tenderly, incident response with defined SLAs, and scheduled upgrade operations - because a contract that can't be safely operated post-launch isn't finished, it's deferred risk.
06
A Track Record You Can Diligence
Our case studies are public, our tech stacks are listed, and our audit partners are named. ProSwap, Meridian Lending, Harbor RWA, Citadel DAO - read the architecture, check the chains, verify the firms. We don't ask you to trust us; we give you the evidence to decide.
Security & testing methodology
How We Make Contracts Audit-Ready Before the Auditors Arrive.
Most audit findings are discoverable before external review. We eliminate the preventable ones so your audit firm spends time on substance - not archaeology.
01
Threat Modelling First
Before writing production code, we document every asset flow, privilege boundary, and external dependency. Attack surfaces are mapped to STRIDE categories and prioritised by exploitability and impact - giving reviewers a structured target list, not a codebase to reverse-engineer.
02
Invariant-Based Testing
We define what must always be true about your system - total supply conservation, access control boundaries, solvency conditions - and encode these as on-chain invariants tested via Echidna and Foundry's fuzzing engine across millions of execution paths, not just the happy path.
03
Property-Based & Differential Testing
For complex financial logic, we run differential tests against reference implementations and property-based suites that explore edge cases no unit test would reach. This catches precision loss, rounding errors, and state transitions that only surface under adversarial conditions.
04
Gas & Failure-Mode Analysis
Every public and external function is profiled for gas consumption across realistic calldata distributions. Revert paths are documented with recovery playbooks - so operators know exactly what failed, why, and how to respond without reading the source code under pressure.
05
Formal Verification (Where It Counts)
For high-value invariants - token supply bounds, liquidation solvency, access control - we apply formal verification tooling where the cost of a missed edge case exceeds the cost of proof. We don't apply it everywhere; we apply it where a unit test passing gives false confidence.
06
Audit Preparation Pack
Every engagement produces a structured handoff document: natspec-complete code, documented invariants, test coverage reports, known limitations, and a threat model your auditors can diligence end to end. External reviewers consistently cite preparation quality as the single biggest factor in audit speed and cost.
Our methodology is available to review before you engage.
Industries
Transforming Industries With Smart Contracts
Nine industries where smart contracts are eliminating intermediaries, automating compliance, and creating verifiable audit trails - from gaming economies and government records to healthcare data and insurance claims.
Gaming
We build smart contract infrastructure for in-game asset ownership, player-to-player trading, and tournament prize distribution - creating tamper-proof economies where digital ownership is verifiable on-chain and fraud is structurally impossible.
Learn moreGovernment
We develop immutable record systems for voting, land registry, tax collection, and public procurement - giving government agencies a transparent, tamper-proof audit trail that reduces administrative overhead and eliminates opportunities for record manipulation.
Learn moreMedia & Entertainment
We build royalty distribution and rights management contracts that pay creators automatically on each use - removing collection agencies from the payment chain and ensuring compensation is triggered by verifiable on-chain events, not manual reconciliation.
Learn moreIdentity Management
We develop self-sovereign identity contracts that give individuals portable, cryptographically verifiable credentials - enabling organisations to verify identity across systems without storing sensitive data in centralised databases vulnerable to breach.
Learn moreSupply Chain
We build provenance and custody tracking contracts that create an immutable record of goods from origin to delivery - giving enterprises, regulators, and end consumers a single verifiable source of truth that intermediaries cannot alter.
Learn moreLending
We engineer lending protocol contracts with automated collateral management, liquidation triggers, and interest accrual - enabling platforms to offer faster, cheaper credit with risk parameters enforced by code rather than manual underwriting processes.
Learn moreReal Estate
We develop tokenised property contracts and automated settlement rails that reduce transaction timelines from weeks to hours - removing escrow intermediaries, automating title transfer conditions, and creating a transparent ownership record on-chain.
Learn moreHealthcare
We build patient-controlled medical data contracts that enable secure, permissioned sharing between providers and researchers - giving patients verifiable control over who accesses their data while creating an auditable consent trail regulators can inspect.
Learn moreInsurance
We develop parametric insurance contracts that trigger payouts automatically when oracle-verified conditions are met - eliminating manual claims processing, reducing fraud surface, and delivering compensation to policyholders in hours rather than weeks.
Learn moreExecution model
Six Phases, One Accountability Chain.
No handoffs that lose context. The team that scopes your project ships it and supports it post-launch. Every phase produces a defined artifact - nothing moves forward without it.
Phase 1: Discovery
Timeline: 3–5 business days
What happens
We map your business logic, asset flows, stakeholder roles, and go-live constraints. We identify chain requirements, custody model, and upgrade strategy before any architecture decisions are made.
Deliverables
- Scope document with explicit in/out boundaries
- Threat model draft aligned to asset flows
- Chain and toolchain recommendation with rationale
- Engagement timeline with phase gates
Phase 2: Architecture
Timeline: 5–10 business days
What happens
We define contract structure, role hierarchies, access control patterns, and upgrade paths. Every architectural decision is documented with the reasoning and the rejected alternatives - so your team and auditors understand why the system is built the way it is.
Deliverables
- Architecture specification document
- Role and permission matrix
- Upgrade strategy with operator runbook
- Invariant specification (what must always be true)
- External dependency map (oracles, bridges, protocols)
Phase 3: Development
Timeline: 3–8 weeks depending on contract complexity
What happens
We build modular, natspec-documented contracts against the architecture spec. Unit tests, integration tests, invariant suites, and fuzz campaigns run continuously - not as a final check before handoff. Every PR is reviewed against the threat model.
Deliverables
- Production contract codebase with full natspec documentation
- Unit and integration test suite (target: 100% line coverage)
- Invariant and fuzz test suite via Echidna / Foundry
- Gas profiling report per function
- Deployment scripts with deterministic address support
Phase 4: Audit
Timeline: 2–6 weeks depending on audit firm availability
What happens
We prepare and submit the audit preparation pack to your chosen firm or coordinate selection from our partner network. We manage the findings triage, implement root-cause fixes (not patches), write regression tests for every finding, and work through fix cycles until the auditor issues sign-off.
Deliverables
- Audit preparation pack (code, docs, invariants, threat model)
- Findings triage report with severity classifications
- Root-cause fix for every critical and high finding
- Regression test per finding
- Final audit certificate coordination
Phase 5: Launch
Timeline: 3–5 business days
What happens
We execute a deterministic deployment with reproducible bytecode, verify contracts on Etherscan and block explorers, run the multisig ceremony with your key holders, and configure on-chain monitoring before declaring the system live. Nothing is rushed at this stage.
Deliverables
- Deployment transaction record with verified bytecode
- Etherscan / block explorer verification confirmation
- Multisig ceremony script and execution log
- Tenderly monitoring configuration
- Post-deployment smoke test report
Phase 6: Support
Timeline: Ongoing - retainer or per-incident
What happens
We monitor on-chain activity, respond to incidents with defined SLAs, execute scheduled upgrade operations, and review contracts as network conditions or protocol dependencies change. The same engineers who built the system are on-call - not a support tier who's reading the code for the first time.
Deliverables
- On-chain monitoring dashboard (Tenderly)
- Incident response playbook with SLA tiers
- Scheduled upgrade operation scripts
- Quarterly gas optimisation review
- Change request process for contract modifications
Timelines assume responsive client feedback at phase gates. Audit firm availability is the most variable factor - we recommend reserving audit slots 4–6 weeks in advance of your target launch date.
How we partner
Engagement Models
Three ways to engage - structured around how your team works, not how we prefer to sell. Every model operates on the same delivery standard, the same engineering team, and the same accountability chain.
01
Dedicated Development Team
3-12 months · 2-5 engineers · Full-time exclusive
Your programme gets a dedicated smart contract engineer, security reviewer, and DevOps engineer working exclusively on your codebase - no context-switching between client projects, no junior handoffs mid-engagement. Suited to protocols building from scratch with ongoing audit cycles, upgrade operations, and post-launch monitoring requirements.
Best for: Greenfield protocol development, DeFi platforms, long-runway enterprise programmes
02
Team Extension
1-6 months · 1-3 engineers · Integrated with your team
We embed directly into your existing engineering team - attending standups, working in your repositories, and operating inside your review processes. You retain architectural ownership; we bring smart contract security expertise, testing infrastructure, and audit preparation capability your team doesn't have in-house yet.
Best for: In-house teams approaching audit, teams adding new contract modules to live protocols, engineering orgs scaling smart contract capability
03
Project-Based
4-16 weeks · Fixed deliverables · Fixed price
A defined scope, a defined artifact set, and a defined price agreed before work begins. Discovery through deployment - or any individual phase - delivered against a milestone schedule with no billable surprises. Audit preparation packs, standalone contract modules, and security reviews are common project-based engagements.
Best for: Specific contract deliverables, audit readiness programmes, one-time migrations or upgrades
Not sure which model fits? Book a 30-min scoping call → - we'll recommend the right structure based on your team, timeline, and contract complexity.
Case studies
Real work, real results.
From AMM routing and lending risk engines to RWA settlement rails and timelocked governance - contract programmes you can diligence end to end.
ProSwap
Uniswap-style AMM with custom pools and routing
ProSwap is a decentralised exchange clone in the Uniswap tradition: constant-product and stable-style pools, slippage controls, and a swap router the client could brand and deploy to their target chain.
$4.2M liquidity bootstrapped in first 72 hours post-launch across 3 pool pairs.
Tech stack
- MongoDB
- Express
- React
- Node.js
- Solidity
- Ethereum
- TypeScript
Meridian Lending Markets
Isolated lending pools with risk-bounded liquidations
Meridian is a lending protocol surface we engineered for institutional desks: per-asset silos, configurable LTV and liquidation bonuses, and predictable auction paths that keep solvency provable under stress.
Zero solvency events across 14 months of live operation under adverse market conditions.
Tech stack
- Solidity
- Foundry
- Chainlink
- TypeScript
- Ethereum
Harbor RWA Settlement
On-chain settlement rails for regulated asset references with policy-gated mint paths, NAV oracle integration, and qualified custodian segregation.
Harbor connects off-chain custody and attestations to transferable reference tokens: mint and burn paths are policy-gated, NAV updates are signer-quorum bound, and redemption queues remain observable to both issuers and investors.
$28M in regulated asset references settled on-chain across 6 institutional counterparties.
Tech stack
- Solidity
- Hardhat
- IPFS
- TypeScript
- Ethereum
Citadel DAO Governance
Timelocked execution with guarded treasury operations and segregated executors
Citadel packages OpenZeppelin Governor patterns for a protocol consortium: weighted delegation, proposal lifecycle SLAs, and segregated executors so routine upgrades cannot touch cold treasury routes without a second quorum.
47 governance proposals executed with zero failed transactions across 9 months of operation.
Tech stack
- Solidity
- OpenZeppelin
- Foundry
- TypeScript
- Ethereum
Testimonials
What our clients are Saying
Discover real stories from clients who have improved delivery, audit readiness, and production operations with our team.
Alexandra Chen
Chief Technology Officer · Northline Markets
Bitronix redesigned our entire settlement architecture. What used to take our ops team four days of manual reconciliation now closes in under fifteen minutes with full audit lineage. The delivery discipline was unlike anything we had seen from an external team.
Daniel Okonkwo
Head of Digital Assets · Helix Capital Partners
We engaged Bitronix to tokenize a $180M real estate portfolio on-chain. They handled investor reporting, compliance checkpoints, and lifecycle events end-to-end. The platform launched on schedule and has processed every redemption without a single incident.
Priya Natarajan
VP of Engineering · Continuum Logistics
The AI automation program Bitronix built replaced a tangle of brittle rules with evaluated, observable workflows. Our exception rate dropped by 40% in the first quarter. The team explained trade-offs honestly rather than just telling us what we wanted to hear.
James Whitfield
General Counsel · Meridian DeFi
We needed a smart contract audit that could actually withstand scrutiny from our legal and compliance teams - not just a checkbox report. Bitronix delivered findings with clear severity classification, remediation paths, and documentation our lawyers could read.
Dr. Sarah Mensah
Chief Digital Officer · Veracure Health Systems
Bitronix built our patient data consent layer on a private blockchain in twelve weeks. They understood HIPAA constraints without us having to explain them twice, and the identity integration with our existing IAM stack was seamless. Exactly what a regulated environment requires.
Marcus Liang
CTO · Axiomatic Energy
Our previous vendor gave us a prototype. Bitronix gave us a production system - with runbooks, observability dashboards, and on-call support from day one. Eighteen months in, our blockchain infrastructure has maintained 99.98% uptime across three regions.
Elena Vasquez
Risk & Controls Lead · Summit Treasury
As risk and controls lead, I cared about traceability more than chain hype. Bitronix mapped every privileged role, emergency pause path, and upgrade story into documentation our regulators could follow. That clarity was the win.
Alexandra Chen
Chief Technology Officer · Northline Markets
Bitronix redesigned our entire settlement architecture. What used to take our ops team four days of manual reconciliation now closes in under fifteen minutes with full audit lineage. The delivery discipline was unlike anything we had seen from an external team.
Daniel Okonkwo
Head of Digital Assets · Helix Capital Partners
We engaged Bitronix to tokenize a $180M real estate portfolio on-chain. They handled investor reporting, compliance checkpoints, and lifecycle events end-to-end. The platform launched on schedule and has processed every redemption without a single incident.
Priya Natarajan
VP of Engineering · Continuum Logistics
The AI automation program Bitronix built replaced a tangle of brittle rules with evaluated, observable workflows. Our exception rate dropped by 40% in the first quarter. The team explained trade-offs honestly rather than just telling us what we wanted to hear.
James Whitfield
General Counsel · Meridian DeFi
We needed a smart contract audit that could actually withstand scrutiny from our legal and compliance teams - not just a checkbox report. Bitronix delivered findings with clear severity classification, remediation paths, and documentation our lawyers could read.
Dr. Sarah Mensah
Chief Digital Officer · Veracure Health Systems
Bitronix built our patient data consent layer on a private blockchain in twelve weeks. They understood HIPAA constraints without us having to explain them twice, and the identity integration with our existing IAM stack was seamless. Exactly what a regulated environment requires.
Marcus Liang
CTO · Axiomatic Energy
Our previous vendor gave us a prototype. Bitronix gave us a production system - with runbooks, observability dashboards, and on-call support from day one. Eighteen months in, our blockchain infrastructure has maintained 99.98% uptime across three regions.
Elena Vasquez
Risk & Controls Lead · Summit Treasury
As risk and controls lead, I cared about traceability more than chain hype. Bitronix mapped every privileged role, emergency pause path, and upgrade story into documentation our regulators could follow. That clarity was the win.
Alexandra Chen
Chief Technology Officer · Northline Markets
Bitronix redesigned our entire settlement architecture. What used to take our ops team four days of manual reconciliation now closes in under fifteen minutes with full audit lineage. The delivery discipline was unlike anything we had seen from an external team.
Daniel Okonkwo
Head of Digital Assets · Helix Capital Partners
We engaged Bitronix to tokenize a $180M real estate portfolio on-chain. They handled investor reporting, compliance checkpoints, and lifecycle events end-to-end. The platform launched on schedule and has processed every redemption without a single incident.
Priya Natarajan
VP of Engineering · Continuum Logistics
The AI automation program Bitronix built replaced a tangle of brittle rules with evaluated, observable workflows. Our exception rate dropped by 40% in the first quarter. The team explained trade-offs honestly rather than just telling us what we wanted to hear.
James Whitfield
General Counsel · Meridian DeFi
We needed a smart contract audit that could actually withstand scrutiny from our legal and compliance teams - not just a checkbox report. Bitronix delivered findings with clear severity classification, remediation paths, and documentation our lawyers could read.
Dr. Sarah Mensah
Chief Digital Officer · Veracure Health Systems
Bitronix built our patient data consent layer on a private blockchain in twelve weeks. They understood HIPAA constraints without us having to explain them twice, and the identity integration with our existing IAM stack was seamless. Exactly what a regulated environment requires.
Marcus Liang
CTO · Axiomatic Energy
Our previous vendor gave us a prototype. Bitronix gave us a production system - with runbooks, observability dashboards, and on-call support from day one. Eighteen months in, our blockchain infrastructure has maintained 99.98% uptime across three regions.
Elena Vasquez
Risk & Controls Lead · Summit Treasury
As risk and controls lead, I cared about traceability more than chain hype. Bitronix mapped every privileged role, emergency pause path, and upgrade story into documentation our regulators could follow. That clarity was the win.
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View serviceFAQ
Frequently Asked Questions
Straight answers for engineering and procurement teams - before you enter diligence.
We prepare your contracts for third-party audit - covering invariant documentation, test coverage, and attack surface mapping - then coordinate review with your chosen firm or recommend one from our trusted network. We implement all remediations and manage fix cycles through to sign-off.
We recommend upgrade patterns based on your risk profile: immutable cores with peripheral upgrade modules for maximum security, transparent proxies with timelocks for operational flexibility, or migration flows with state transfer scripts for full redeployment. Every pattern ships with operator runbooks and rollback procedures.
EVM-compatible networks are our primary environment - Ethereum, Polygon, Arbitrum, Optimism, Base, Avalanche, and BNB Chain. We also support Solana (Anchor/Rust), Aptos and Sui (Move), and StarkNet (Cairo). Chain selection is driven by your liquidity, custody, and regulatory requirements, not our tooling preferences.
Yes. We design oracle boundaries with Chainlink price feeds, heartbeat checks, and circuit breakers for market-sensitive functions. For automation we integrate Chainlink Automation or Gelato with failure-mode documentation. Every off-chain data dependency is treated as a trust boundary and modelled in the threat assessment.
Six phases: Discovery (scope, threat model, chain selection) → Architecture (role design, upgrade path, invariant spec) → Development (contracts, test suites, tooling) → Audit (external review, fix cycles, regression coverage) → Launch (deterministic deploy, Etherscan verification, multisig ceremony) → Support (incident response, monitoring, upgrade operations). Each phase produces a defined artifact set agreed upfront.
Both. For existing codebases we begin with a code review and threat assessment before scoping remediation or extension work. We document what we inherit, flag technical debt, and establish a test baseline before writing a single line of new code. Greenfield projects follow the full six-phase process from Discovery.
Every finding is triaged by severity - critical, high, medium, low, and informational. Critical and high findings receive root-cause fixes, not patches. Each fix ships with a regression test that proves the vulnerability is closed. We produce a remediation report your audit firm can verify before issuing the final certificate.
A standard greenfield contract programme - from Discovery through audit-ready deployment - typically runs 8–16 weeks depending on contract complexity and audit firm availability. Team structure is a lead smart contract engineer, a security-focused reviewer, and a DevOps engineer for deployment pipelines. Timeline and team size are scoped per engagement, not templated.
Yes. Post-launch support covers on-chain monitoring with Tenderly alerts, incident response with defined SLAs, scheduled upgrade operations, and gas optimisation reviews as network conditions change. Support is available as a retainer or on a per-incident basis depending on your operational requirements.
The most useful starting point is: target chain and network, type of contract (token, protocol, governance, etc.), approximate TVL or transaction volume at launch, your preferred audit firm if you have one, and your go-live timeline. We respond within one business day with a scoped recommendation. No NDA required for an initial conversation.