Blockchain development that ships — and stays secure.
We build smart contracts, DeFi protocols, and Web3 backends for funded startups in the US, UK, and Australia. Every contract is audited before it touches mainnet. 150+ projects shipped since 2021.
Most blockchain projects fail before they launch. Here’s why — and how we fix it.
The problem
Great blockchain ideas handed to web developers who don’t really understand Web3. The results are predictable: insecure contracts, broken wallet integrations, projects that go live and get exploited.
How we work
Every ByteBridge contract is written by Solidity or Rust engineers with 3+ years of on-chain experience. Not supervised graduates. Engineers who’ve shipped production contracts and know what goes wrong.
The problem
Security reviewed after the build — if at all. Vulnerabilities are found post-launch, sometimes after real funds have been affected.
How we work
Internal security review is part of every engagement, not an optional extra. We test for the attack vectors that have drained real protocols: reentrancy, access control flaws, front-running, integer overflow.
The problem
Agencies that disappear at launch. Once the final invoice is paid, there’s no one watching the contract or available when something needs updating.
How we work
Post-launch monitoring, maintenance, and upgrade support are part of how we work. The contract we ship remains our responsibility. Most of our client relationships continue well past go-live.
What we deliver in a blockchain engagement.
- EVM-compatible smart contracts (Solidity)
- Rust programs for Solana
- DeFi protocol architecture
- Token contracts (ERC-20, ERC-721, ERC-1155, BEP-20)
- Staking and yield mechanics
- Governance contracts and DAOs
- NFT minting and marketplace logic
- Cross-chain bridge integrations
- Gas optimisation
- Testnet and mainnet deployment
- Contract documentation and ABI
- Post-deployment monitoring
Chains we build on.
Ethereum
Most established network, deepest ecosystem, strongest security guarantees. Choose Ethereum when decentralisation and tooling depth matter more than gas costs.
Polygon
EVM-compatible, low gas, fast finality. Best for high-transaction-volume apps where Ethereum fees would make the UX unworkable at scale.
Solana
High throughput, low fees, growing DeFi and NFT ecosystem. The right choice for speed-sensitive applications where sub-second confirmation matters.
BNB Chain
Large retail user base and deep BSC liquidity. Good for token launches and DeFi projects targeting the BNB Chain ecosystem.
Avalanche
Custom subnet architecture and enterprise-grade throughput. Strong fit for private chains, high-volume DeFi, and institutional applications.
Base (Coinbase L2)
Coinbase-backed Ethereum L2 with growing developer ecosystem and low fees. Good for consumer-facing Web3 apps targeting mainstream adoption.
Every contract we ship has been through this checklist.
Architecture review — We review the contract design before writing a line of code. Most security vulnerabilities are architectural, not syntactic.
Reentrancy attack testing — We check every external call, state update order, and callback path for reentrancy exposure.
Integer overflow and underflow checks — Every arithmetic operation is reviewed. We verify SafeMath usage or Solidity 0.8+ overflow protection is correctly applied.
Access control and permission validation — We audit every privileged function for correct ownership checks, role assignments, and upgrade guards.
Front-running vulnerability assessment — We identify functions that are sensitive to transaction ordering and assess the risk in context.
Gas limit and denial-of-service testing — We check for unbounded loops, calldata sizing, and patterns that could allow a DoS attack.
External call safety review — Every call to an external contract or oracle is reviewed for trust assumptions and failure modes.
Full unit and integration test suite — Minimum 90% coverage on critical paths. Edge cases and adversarial scenarios are included explicitly.
Testnet deployment and live testing — We run the contract on testnet under realistic conditions before touching mainnet.
Written security summary before mainnet — You receive a written summary of what was checked, what was found, and what was resolved before we push to mainnet.
For contracts handling significant value, we recommend an independent third-party audit in addition to our internal review. Our internal review and a third-party audit serve different purposes — both matter for high-stakes deployments. We can connect you with auditors we trust.
How a blockchain project works with us.
Discovery call
We understand your protocol design, intended behaviour, edge cases, and risk profile. We ask questions your previous agency probably didn’t.
Architecture proposal
You get a design document, tech stack recommendation, and fixed-scope quote before any code is written. No surprises after the work starts.
Build in sprints
Weekly demos on a private testnet. You see the contract behaviour running live every week — not a black box that opens after two months.
Audit, deploy, support
Internal security review, written security summary, mainnet deployment, and ongoing monitoring. We stay involved after launch.
This is for you if…
You've raised a round and have a whitepaper but no in-house blockchain engineer. You need a team that can take the technical architecture from design to deployed contract — without needing supervision.
Your team needs a senior Solidity engineer embedded for a sprint or quarter. You don't have time for a three-month hiring process. You need someone who can sit in standups and contribute from week one.
You're exploring blockchain for supply chain provenance, asset tokenisation, or internal tooling. You need an engineering team that can scope the project honestly and tell you if it actually makes sense.
“ByteBridge built our DeFi staking platform from zero. They pushed back on a few decisions that would have caused gas issues at scale — calls I’m glad they made. The audit report they produced before launch found two issues our internal team had missed.”