Blockchain Developer / Olzhas

3+ years of experienceAlmaty, Kazakhstan

Full-stack and Blockchain Developer with strong experience in blockchain platforms (Solana, Ethereum, Polygon, Tron) and backend systems. Specializes in DeFi applications, smart contracts, and scalable API development using Node.js, NestJS, and Golang.

Skills

  • Full-Stack Development: Node.js, NestJS, Express.js, Next.js/React, Golang, Databases: PostgreSQL (schema design, query optimization), Redis, Elasticsearch
  • Databases: PostgreSQL (schema design, query optimization), Redis, Elasticsearch
  • Web3: Solidity, Smart Contracts, EVM, Polygon, Solana, Tron, MetaMask, TronLink
  • API & Architecture: RESTful API, GraphQL, gRPC, Event-driven systems, BullMQ, NATS
  • Infrastructure: Docker, Git, GitLab CI/CD, AWS (EC2, EventBridge), Cloud integrations
  • Security: Auth 2.0, ECDSA signing, KYC/AML integrations (SumSub, Scorechain)
  • Languages: JavaScript, TypeScript, SQL
  • Soft Skills: Remote collaboration, Agile workflows, cross-functional communication
  • Languages (spoken): English (Upper-Intermediate), Kazakh (Native)

Experience

Feb 2026 — now

Full-Stack / Web3 Developer

[Under NDA] Crypto Exchange
  • Fixed production bugs and shipped new features in a large NestJS + PostgreSQL codebase
  • Extended the Admin Panel with UI and wiring for ops workflows tied to exchange/refund edge cases
  • Contributed to a new DEX module with chain/network configuration and integration with existing backend routes
Dec 2025 — Feb 2026

Backend Developer

Livin.kz
  • Developed GraphQL API (NestJS) for hotel search and booking, integrating provider with 3M+ properties
  • Built background data pipelines (Bull, Redis) and optimized PostgreSQL schema/queries
  • Implemented Elasticsearch-based search with geo-filtering and relevance ranking
  • Set up Docker + GitLab CI/CD, integrated AWS (EC2, EventBridge) and Google Maps/Places APIs
Oct 2025 — Feb 2026

Full-Stack / Web3 Developer

SFXDX
  • Developed backend for DeFi copy trading platform on Solana with real-time on-chain event processing
  • Implemented event-driven architecture (queues, processors) and optimized data layer (PostgreSQL)
  • Built support for advanced orders (TP/SL, parent-child) and PnL calculation engine
  • Integrated Pyth Oracle and developed keeper services for automated order execution
Jun 2024 — Dec 2025

Full-Stack / Web3 Developer

KAZ.ONE.LABS
  • Developed full-stack applications (Node.js, Express.js, Next.js) and reusable npm packages
  • Designed and implemented smart contracts (Solidity) for Ethereum, Polygon, Tron
  • Built and supported private blockchain infrastructure (Golang)
  • Integrated Web3 and external services: MetaMask, TronLink, SumSub (KYC), Scorechain (AML)
Nov 2022 — Jun 2024

Full-Stack Developer

ORIS LAB
  • Developed secure API with ECDSA (Ethereum-based request signing)
  • Built OAuth 2.0 SSO service for unified authentication across multiple products
  • Developed Web3 service for off-chain multisig custodial wallet management
  • Created Telegram support bot integrated with an LLM for automated user assistance

Education

Almaty, Kazakhstan

Bachelor's in Computer Science

International Information Technology University

Contact

Takovska 5, Belgrade, 🇷🇸 Serbia.

Email: [email protected]