I will build a blockchain indexer and API with typescript

M
mitosip
M
mitosip
Dmitrii O
build a blockchain indexer and API with typescript
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build a blockchain indexer and API with typescript

About this gig

Need blockchain data in a form your app can actually use? I build indexers and backends that read on-chain data and serve it through a clean API.


I'm a senior backend engineer with 5+ years of experience. I've built blockchain indexers, JSON-RPC integrations and signature-validation logic in production, in TypeScript and Node.js.


What I can do:

- Index events and transactions into PostgreSQL

- Expose the data via REST or GraphQL

- Custom JSON-RPC and WebSocket subscriptions

- Signature validation (ECDSA/secp256k1)

- Dockerised setup, documentation and handover


Stack: TypeScript, Node.js, NestJS, PostgreSQL, Docker.


How it works: tell me which chain and which data you need, I confirm scope and timeline, then deliver with full source code.


Unsure what you need? Message me first and I'll suggest a package.

  • Expertise

    • Debugging
    • Performance
    • Security
    • Databases
    • Testing procedures

  • Programming language

    • TypeScript

  • Backend framework

    • Express.js
    • Fastify
    • NestJS
    • Node.js

Get to know Dmitrii O

Dmitrii O

Senior Software Engineer

  • FromGermany
  • Member sinceMay 2026

  • Languages

    English, Russian, German
I am a backend engineer with over 5 years of experience building production systems in TypeScript, Node.js, and Rust. I specialize in event-driven architecture, PostgreSQL at scale, and AWS/Kubernetes deployment. I have a proven track record of owning services end-to-end, from architectural design to long-term operation and partner integrations.

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