// US-based Blockchain developers
Free project plan & cost estimate in 48 hours.
Senior Blockchain developers, based in the US, working your hours
Blockchain apps, smart contracts, and integrations, built by US engineers who put security and audits first.
- Interview engineers before you pay anything
- 100% U.S.-based, working your hours
- No brief or spec needed to get started
First 5 Dev Hours Free
Project plan. Roadmap. Cost & ROI estimation.
Real engineers. Real conversations.
Talk to an engineer. Not a salesperson.
Free · No commitment · Project-focused call
Most teams interview matched engineers within a week
Not the right fit? We bring in a replacement
Get your free project plan
Three quick steps. No brief needed.
Free · No commitment · Reply within one business day
// teams we've worked with
“NextGen scaled us from 2 to 7 dedicated engineers in under a quarter. Enterprise-grade capacity, zero agency drag.”
Sound familiar?
- Hiring a senior Blockchain developer full-time is taking months.
- Your Blockchain codebase has grown messy and every change breaks something else.
- Offshore hand-offs and time-zone gaps turn one-day fixes into week-long threads.
- You need someone senior enough to make decisions, not just close tickets.
What our Blockchain engineers build
Protocols & apps
Contracts, wallets, and back-ends built for audit.
Rescue & upgrades
Existing Blockchain work stabilized, documented, and brought up to date.
Integrations
Blockchain connected cleanly to the rest of your systems.
How it works
- 01
Pick a time
Book a 30-minute project call directly in our calendar.
- 02
Talk through the problem
Tell us what needs building, what's stuck and what success looks like. No spec needed.
- 03
Your plan in 48 hours
Get your project plan, roadmap, cost and ROI estimates. The plan is yours to keep.
- 04
First 5 dev hours free
Agree the scope with our team. Decide whether to continue before any paid work begins.
Common questions
Will this turn into a sales pitch?
No. The call is about your project: what needs building, what's stuck, and whether we have the right engineers. If we're not a fit, we'll say so.
What do I get for free?
A project plan, roadmap, cost estimate and ROI estimate within 48 hours of your project call. Your first 5 development hours are free, too. We agree the scope and any paid work with you before proceeding.
Do I need a spec or brief?
No. Tell us the problem in plain words and we'll help shape the scope with you.
Are the engineers really in the U.S.?
Yes. Every engineer lives and works in the United States. No offshore hand-offs, and that's in the contract.
What our clients say
"NextGen scaled us from 2 to 7 dedicated engineers in under a quarter. Enterprise-grade capacity, zero agency drag."
"Their R&D tax credit workflow platform paid for itself in the first filing season."
"AI-native from day one. Our IRS transcript pipeline runs 24/7 without a human in the loop."
"Property tax appeals used to take weeks. Their comp analysis tooling turned it into hours."
"The AI intake agent handles our tier-1 patient calls with a hand-off cleaner than our old call center."
"POS, inventory, ordering — all unified. We finally have one source of truth across every location."
"The procurement platform paid for itself in the first quarter of use."
"They shipped our matching engine in 6 weeks. Our old team would've taken 6 months."
"Enterprise-grade delivery without the enterprise-agency price tag."
"Their team plugged into our sprint on day one. Zero ramp time."
"NextGen scaled us from 2 to 7 dedicated engineers in under a quarter. Enterprise-grade capacity, zero agency drag."
"Their R&D tax credit workflow platform paid for itself in the first filing season."
"AI-native from day one. Our IRS transcript pipeline runs 24/7 without a human in the loop."
"Property tax appeals used to take weeks. Their comp analysis tooling turned it into hours."
"The AI intake agent handles our tier-1 patient calls with a hand-off cleaner than our old call center."
"POS, inventory, ordering — all unified. We finally have one source of truth across every location."
"The procurement platform paid for itself in the first quarter of use."
"They shipped our matching engine in 6 weeks. Our old team would've taken 6 months."
"Enterprise-grade delivery without the enterprise-agency price tag."
"Their team plugged into our sprint on day one. Zero ramp time."
Hire US-based blockchain developers from NextGen Coding Company for smart contracts, wallet-connected applications, and on-chain data integrations. Blockchain projects need clear boundaries between contract logic, transaction signing, and off-chain services. Common problems include unsafe access controls, unreliable event indexing, and interfaces that confuse submitted transactions with confirmed results. Senior engineers work your hours and participate in your standups as those decisions take shape.
For an EVM project, frame interviews around Solidity 0.8.x, OpenZeppelin Contracts, Foundry or Hardhat, and viem or ethers.js. A Solana application instead calls for Rust, account-model knowledge, and potentially Anchor. Specify the target chain, upgrade strategy, and testing expectations before choosing an engineer. We sign an NDA and full IP assignment before code work; every engineer lives and works in the US.
Frequently asked questions
- Should I hire a Solidity developer or a Solana developer?
- Choose based on the network and execution model your application requires. Solidity targets EVM networks such as Ethereum and compatible rollups, while Solana programs commonly use Rust and may use Anchor. Contract storage, account access, transaction composition, and tooling differ substantially. General blockchain familiarity does not replace experience with your target environment.
- What testing should happen before deploying a Solidity contract?
- Include unit tests, fuzz tests, and invariant tests around permissions, accounting, and state transitions. Foundry supports these workflows, while fork tests can exercise interactions with existing protocols. Use static analysis such as Slither and plan an independent security review where appropriate. Passing tests does not prove a contract is safe.
- How do developers make wallet transaction flows reliable?
- Treat wallet connection, network selection, signature requests, transaction submission, and confirmation as separate states. With viem or ethers.js, handle rejected requests, reverted transactions, replacements, and RPC failures explicitly. The interface should not report completion from a transaction hash alone; define confirmation requirements that account for the target chain's finality behavior.
- Do blockchain applications need an off-chain backend?
- Many do. Search, notifications, reporting, and historical views often belong in off-chain services rather than contract storage. An indexer using The Graph or a custom event pipeline can populate application data. Plan for chain reorganizations, replayable ingestion, and duplicate events, and distinguish indexed views from authoritative on-chain state.
- What should we discuss before hiring a blockchain developer?
- Bring the target chain, contract interfaces, wallet requirements, and any audit findings or threat models. Explain whether the work involves new contracts, upgrades, indexing, or an existing dapp. Book a 15-minute call to start matching; if the fit is not right, we bring in a replacement with a proper hand-over.
- Are your developers really based in the US?
- Yes. Every engineer lives and works in the United States. No offshore subcontracting and no hand-offs to another team. That's written into the contract.
- How fast can someone start?
- Most teams interview matched engineers within a week of the first call. Start dates depend on your interview process.
Related reading
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- Resource library
Every guide and benchmark we publish.
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