Summary
✨ AI‑Generated
A full-time onsite backend blockchain engineering role focused on secure multichain custody and payment infrastructure. You will build wallet and transaction modules, develop blockchain network connectors, handle transaction signing and fees, and maintain monitoring and confirmation workflows across multiple networks.
Highlights
Work hands-on with a multichain financial backend spanning EVM networks, TRON, and Bitcoin, covering wallet infrastructure, transaction processing, payouts, and secure custody workflows.
Description
🚀About the role
We run a multichain custody & payments backend (Node.js / TypeScript) powering financial operations across EVM chains, TRON, and Bitcoin.
💡THIS IS FULL-TIME ON-SITE OCCUPATION in Limassol, CY
Tech stack
Node.js · TypeScript · Express · PostgreSQL.
On-chain: ethers v6 (EVM), TronWeb (TRON), bitcoinjs-lib / PSBT (Bitcoin).
Multisig: Gnosis Safe SDK + native TRON/BTC multisig.
Docker.
What you'll do
Implement and maintain backend modules across the custody lifecycle: wallet generation, deposit monitoring, sweeping, payouts, and batch withdrawals.
Build and extend per-network connectors (EVM / TRON / BTC): transaction construction, signing payloads, fee/gas handling, broadcast and confirmation tracking, etc.
What needed
3+ years backend engineering in Node.js + TypeScript (Express or similar) with PostgreSQL and any of ORMs.
On-chain integration experience with at least one of EVM / TRON / Bitcoin, and the ability to ramp on the others.
Wallet fundamentals: HD derivation (BIP32/44), key management, transaction construction & signing.
Security-conscious engineering — you know you're handling keys and moving funds; you code defensively and test edge cases.
Good English, clean git/PR hygiene.
Nice to have
Multisig experience (Gnosis Safe SDK, native TRON/BTC multisig).
Bitcoin PSBT, EVM Multicall3, gas/relayer strategies.
AML / transaction-monitoring integrations.
OpenAPI, REST API, idempotency and rate limiting techniques.
Custody / exchange / payments backend background.
We Offer
Opportunity to work on real fintech and crypto products
International and multicultural team
Fast-moving environment with ambitious growth plans
Competitive compensation package
Professional growth and long-term career development
Opportunity to directly contribute to blockchain infrastructure and digital asset products
If you are passionate about blockchain technology and want to build secure, scalable smart contract solutions for a growing fintech group, we would be happy to hear from you!
