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HASHXLABS
Service

Blockchain development

End-to-end blockchain engineering on EVM chains and Solana: smart contracts, DeFi protocols, tokens, wallets, cross-chain infrastructure and the applications around them. Every build starts from a written specification and ships with its tests.

Discuss your project What you get
What you get

Deliverables

Smart contracts, DeFi, tokens, wallets, bridges, chains and dApps, built against a written spec.

Spec & invariants

A written description of what must always hold, reviewed with you before code.

Contracts with tests

Unit, fuzz, invariant and fork tests. CI runs all of them on every pull request.

Deployment & upgrades

Scripted deploys, an upgrade or immutability decision written out, multisig and timelock setup.

Integration

Indexer, API and frontend wiring when you need it, by the same people.

Handover

Architecture notes, a runbook and a walkthrough, so your team owns it afterwards.

Approach

How we work on this

Each step produces something you can read or run, so progress is never a matter of trust.

  1. 1

    Spec

    We write down what the system must always do and must never do. Those invariants become the acceptance test for everything after.

  2. 2

    Threat model

    Who can call what, with what money, in what order. Each risk gets an owner: a guard, a test, or an explicit decision to accept it.

  3. 3

    Build

    Small contracts, explicit access control, no cleverness we cannot test. Every pull request carries its own tests.

  4. 4

    Break

    Invariant fuzzing, static analysis, fork tests and manual review. Findings arrive as failing tests you can run yourself.

  5. 5

    Ship

    Deployment scripts, key ceremonies, monitoring and a runbook. We stay on for the first weeks on mainnet.

Risk focus

What we test hardest

  • Call ordering and reentrancy
  • Privileged roles and upgrade keys
  • Rounding and share-price inflation
  • Oracle freshness and manipulation
  • Cross-chain message replay
Related capabilities

More in Blockchain

Full catalogue
Blockchain developmentProduction chains, contracts and dAppsBlockchain integrationConnect ledgers to the systems you runMigration & network upgradesMove chains and contracts without downtimeBlockchain consultingArchitecture, feasibility and chain choiceLayer 2s & appchainsRollups and application-specific chainsBridges & interoperabilityMessaging and token movement across chains
FAQ

Common questions

Whichever fits the product. If you have not decided, we write out the trade-offs for your case before any code.

It depends on how much you expect to change. If upgradeable, we put the upgrade path behind a multisig and a timelock and write down who holds what.

Yes. Indexers, APIs and the frontend can be part of the same engagement.

Have a project in mind?

Tell us what you are building and what must not go wrong. An engineer who would work on it will reply.

Start a project info@hashxlabs.com