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Smart contracts and integration
Fit check first

Blockchain Development

You get a straight answer on whether blockchain fits your product, then smart contracts and on-chain verification built into the systems you run. For teams where two organisations would otherwise reconcile databases by email.

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BRIEF: CHAIN-04 AUDIT: READY

When a ledger earns its place

Product owners and CTOs whose product coordinates with organisations that do not share one trusted database: document verification, digital identity, tokenised access, programmable payouts or supply-chain records. A board may be asking about blockchain, or a pilot already runs apart from billing and legal review and has to join the product or stop.

Time to call us when

  • Two partners keep separate records and fix mismatches in a quarterly meeting.
  • The board wants a blockchain strategy, and we doubt we need one.
  • We ran a token pilot that never connected to billing or support.
  • Our contract will hold user funds, and no outsider has reviewed it.

Why blockchain projects stall

A database problem dressed as a ledger

When the parties already trust one database, a blockchain adds complexity and changes nothing for the user, so the build rarely justifies its cost and support load.

Blockchain treated as the product

Treat the chain as the product instead of the rail, and the boring parts nobody planned sink the launch: billing, support, legal review and customer education.

Token mechanics nobody stress-tested

Speculative token mechanics and royalties without enforcement look like revenue on paper. If nobody has tested them under hostile conditions, they tend to fail in the first downturn.

We test the fit before writing a contract

Each project starts with one question: what changes for the user if blockchain is part of the system? If the answer is not clearer ownership, better verification, coordination between organisations or lower reconciliation cost, we say so, and you keep a database. When it holds, we design a hybrid: operations off-chain, verification on-chain.

Our blockchain work always runs next to a normal product engineering track. Billing, permissions, support and legal review are planned with the protocol decision, so the on-chain feature behaves like the rest of your product. The interface stays understandable and forgiving, because a product that needs expert knowledge for basic flows struggles.

31 items
Pre-launch smart-contract checklist before sign-off
30 minutes
Call that decides whether blockchain fits

Hybrid architecture

Operations run off-chain and verification is anchored on-chain. The split gives you far more control over throughput, cost, storage and recovery than a fully on-chain design.

Smart contracts

Contract logic written and reviewed without AI assistants, signed off against our 31-item pre-launch checklist, with a second-party audit before mainnet when user funds are involved.

Wallets and onboarding

Embedded wallets with social login, so a non-crypto user can verify a document without learning what a seed phrase is. Asking them to learn shows up as churn.

Verification flows

Screens where a user verifies a document, proves ownership or checks status across organisations that do not trust each other, without relying on a single company's database.

What a blockchain build hands over

  • A written fit decision: ledger, hybrid or plain database
  • An architecture separating off-chain operations from on-chain verification
  • Smart contracts signed off against our 31-item checklist
  • Wallet and onboarding flows non-crypto users can complete
  • Adoption tracking with a completion-rate target and stop rule

From fit check to measured launch

Ledger only where it pays

  1. Fit check

    A 30-minute architecture call. You bring the use case; we tell you whether on-chain verification helps or whether a shared database solves it for less.

    Duration
    30 minutes
    Result
    A clear answer before any build budget
    • Use case
    • Filter

  2. Design

    We split operations from verification, pick a chain that suits the use case, and plan billing, permissions, support and legal review alongside the protocol decision.

    Duration
    2 weeks
    Result
    Architecture and chain choice agreed with your team
    • Hybrid
    • Chain choice

  3. Build and review

    Contracts and off-chain services are built next to your product track as fixed milestones, with contract logic reviewed against our pre-launch checklist before anything reaches mainnet.

    Duration
    Per milestone
    Result
    Contracts signed off and connected to billing
    • Contracts
    • Review

  4. Launch and measure

    We define the user job, instrument adoption and watch completion rate. If the numbers do not move, we recommend removing the feature instead of defending the launch.

    Duration
    After launch
    Result
    Keep or remove, decided on completion data
    • Adoption
    • Completion rate

Chains we recommend by use case

Defaults from our published guidance; the use case decides.

Most SMB use cases
  • Polygon
  • EVM-compatible L2 networks
High-throughput consumer apps
  • Solana
Settlement assurance first
  • Ethereum mainnet

Ways to start a blockchain project

Two-week diagnostic

For a use case that passes the fit check: hybrid design, chain choice and an integration plan covering billing, permissions and support.

Integration build

Contracts, off-chain services and wallet flows built next to your product track, with each milestone at a fixed fee, or time and materials while scope still moves.

Every diagnostic and build gets a fixed price, agreed after the 30-minute call.

Related reading

All articles →

Blockchain questions buyers ask

How do we know whether our product needs a blockchain?

Apply the two-database test. If the parties already trust a single database, you do not need a blockchain. If two organisations would otherwise reconcile separate databases by email and a quarterly meeting, you might. Our guide on when blockchain fits a product covers the rest.

Should we launch a token?

Almost never as your first feature. A token can make sense when your product needs a unit of account that is portable across organisations and survives an external regulator's read-through. If the token is simply a marketing mechanic, our answer is no.

Which chain would you build on?

It depends on the job. For most SMB products we recommend Polygon or an EVM-compatible L2 with reasonable fees and good developer tooling, Solana for high-throughput, low-fee consumer apps, and Ethereum mainnet only when settlement assurance matters more than cost.

Do our smart contracts need an external audit?

Yes, whenever the contract logic touches user funds or external counterparties. Such contracts get two checks before mainnet: our internal review against the 31-item checklist, then a second-party audit. The audit is cheap insurance against incidents that cannot be undone on-chain.

Do you use AI coding assistants on smart contracts?

No. Smart-contract logic is on our list of no-AI zones, next to authentication, cryptographic primitives and payment code. These are places where a plausible but wrong answer can end a business, so our engineers write and review that logic by hand.

Client reviews

What clients say about working with Vadim

5.0 75 reviews on Google

All reviews
Ofir Halawany 2023 · Google ★★★★★

Vadim, thank you for the wonderful service. A pleasant, professional guy who knows what he is doing and, most importantly, puts service above everything. I will no doubt keep using your web development services!! Thanks again!

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יוסף שמול 2025 · Google ★★★★★

A true professional. I had a critical problem that stopped my site from loading; within minutes he fixed everything and even gave me professional tips. Fast, professional service at a fair price - I recommend him to everyone.

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Tova Dekkers 2024 · Google ★★★★★

Vadim gave my office excellent service, exactly what I needed: guidance, a custom build, and he is always available when I need help with something. He sorted out my whole WordPress site, marketing, built a CRM and more.

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dorit hadad 2025 · Google ★★★★★

Vadim helped us solve a complex problem with Facebook very professionally. He was attentive and available to us throughout the whole process. Thank you very much for the service!

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גולן סיון סרוסי 2025 · Google ★★★★★

Vadim is a great guy, professional and reliable. He solved a break-in on my site and secured it, all over WhatsApp - brilliant.
And his word is his word.
Highly recommended.

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GuyIsrael Judaica 2022 · Google ★★★★★

I ran into a problem on my WordPress site and asked Vadim for help. He found the fault quickly and within an hour the site was working properly again. A true professional.

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Yaniv Cohen 2022 · Google ★★★★★

I contacted Vadim about a particular problem on my site. He is fully available, even late at night. Professional, and he knew how to give an expert opinion on the problem.

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יוסי שחר 2025 · Google ★★★★★

Vadim is a lovely person with one-of-a-kind service.
He listens to every question, explains patiently and quickly understands what the client wants.
Highly recommended.

Translated from Hebrew

Test your use case

Describe who needs to trust whom and what gets reconciled today. On the call we tell you whether a ledger helps before any build starts.