Blockchain Backend Developer (Fintech)

TL;DR

Blockchain Backend Developer (Fintech): Developing and maintaining blockchain backend services including block indexers, transaction processing, and node integrations with an accent on Ethereum, TRON, BNB, BTC-like chains, and TON. Focus on designing scalable, fault-tolerant architectures, secure handling of private keys, and ensuring reliable payment flows in fintech and iGaming domains.

Location: Limassol, Cyprus

Company

hirify.global is an international IT product company focused on fintech and iGaming solutions, headquartered in Limassol, Cyprus.

What you will do

• Develop and maintain block indexers and transaction-processing services for multiple blockchain networks.
• Prepare, sign, and broadcast transactions with lifecycle and status management.
• Integrate with blockchain nodes via RPC/REST/gRPC, ensuring error handling and multi-client support.
• Design scalable, fault-tolerant architectures for indexers, broadcasters, and schedulers.
• Collaborate with Payments, Wallet, and AML teams to build end-to-end payment flows.
• Implement testing strategies and observability with Prometheus and Grafana.

Requirements

• Must have 3+ years backend development experience and 2+ years in crypto/blockchain projects with production workloads.
• Strong TypeScript (NestJS) and/or Go experience.
• Deep understanding of Ethereum, TRON, BNB, BTC-like chains, TON, and their RPC/API mechanisms.
• Experience with web3.js, ethers.js, or similar libraries.
• Strong SQL skills including query optimization and zero-downtime migrations.
• English proficiency at least B2 level.

Nice to have

• Experience with fintech payment or crypto-financial products.
• Basic smart contract development or reading skills in Solidity or Rust.
• Experience with event-driven microservices using Kafka or RabbitMQ.
• Knowledge of CI/CD best practices for blockchain services.
• Experience creating SDKs, CLIs, or libraries for blockchain interaction.
• Open-source contributions or personal technical projects.

Culture & Benefits

• High salary with performance bonuses and regular revisions.
• Flexible work schedule Monday to Friday with flexible start time.
• 24 days holiday leave.
• Office with first line sea view, gym, spa, corporate meals, and English lessons.
• Strong professional team and exciting growth opportunities.