Senior Crypto Developer

Gamdom; Greater London; On-site; GBP 80,000 - 100,000; Full time

Job summary

A leading blockchain company in Greater London is seeking a Senior Crypto Developer to enhance their blockchain infrastructure and Web3 applications. You will be responsible for backend microservices development, optimizing bitcoin-core nodes, and maintaining Ethereum pipelines. The ideal candidate has over 5 years of experience in backend development with Node.js and TypeScript, along with a deep understanding of blockchain technologies. The company offers a competitive salary and a dynamic work environment.

Benefits

Professional growth opportunities

Competitive salary

Supportive work environment

Qualifications

• 5+ years of backend development experience, including significant work with Node.js and TypeScript.
• Hands-on experience with Ethereum, Bitcoin, and L2s (e.g., Arbitrum, Optimism, Polygon).
• Strong understanding of secure wallet management practices.

Responsibilities

• Own backend micro-services in Node.js / TypeScript that interface with multiple blockchains.
• Run and optimize bitcoin-core (BTC / LTC) nodes for high-volume deposit and withdrawal flows.
• Build and maintain Ethereum transaction pipelines using ethers.js.

Skills

Backend development experience

Node.js

TypeScript

Blockchain fundamentals

Ethereum and Bitcoin

Web3 libraries

Secure wallet management

React

Job description

Gamdom is home to thousands of betting options for both sports and casino players to wager on. Since 2016, we have been steadily growing to provide more than just casino games and sports betting events to enjoy; With us, you can enjoy unique bonuses and earn massive rewards simultaneously. Discover all the rewarding features Gamdom can offer you below.

We are seeking a talented and driven Senior Crypto Developer to join our dynamic team. This role is integral to building and maintaining our blockchain infrastructure and Web3 applications, which rely heavily on live data and real-time functionality. The ideal candidate will possess strong expertise in backend microservices, blockchain integrations, and Web3 tooling, while maintaining a deep commitment to code quality, security, and scalability.

Key Responsibilities

• Own backend micro-services in Node.js / TypeScript that interface with multiple blockchains, following clean-architecture and test-driven development principles.
• Run and optimize bitcoin-core (BTC / LTC) nodes, manage UTXO sets, fee estimation, mempool monitoring, and wallet RPCs for high-volume deposit and withdrawal flows.
• Build and maintain Ethereum transaction pipelines using ethers.js - handle ERC-20 / ERC-721 token transfers, reorgs, transaction signing / broadcasting, and nonce management.
• Integrate additional L1 / L2 networks by abstracting blockchain-specific logic behind a unified service layer, enabling rapid support for new tokens and chains.
• Leverage Fireblocks or similar MPC / custodial APIs to manage secure wallet operations, policy enforcement, and multi-signature approval flows.
• Develop and maintain frontend Web3 wallet integrations (e.g., MetaMask, WalletConnect, Ledger) using TypeScript / React, delivering seamless UX and real-time transaction feedback.
• Build scalable deposit & withdrawal infrastructure, including queueing systems, idempotent webhooks, reconciliations, wallet sweeps, address management, and fee optimization.
• Embed security and compliance features, KYT screening, whitelisting, secrets management, and rate-limiting into application code and CI / CD pipelines.
• Monitor blockchain health and system performance establish SLAs, create alerting systems, implement incident response plans, and lead post-mortems.
• Document APIs, architecture decisions, and operational runbooks; mentor peers through code reviews and knowledge sharing sessions.

What We’re Looking For

• 5+ years of backend development experience, including significant work with Node.js and TypeScript
• Strong understanding of blockchain fundamentals, especially UTXO vs. account-based models
• Hands‑on experience with Ethereum, Bitcoin, and L2s (e.g., Arbitrum, Optimism, Polygon)
• Familiarity with Web3 libraries such as ethers.js, web3.js, and experience interacting with RPC APIs
• Deep understanding of secure wallet management practices and MPC technology
• Proficiency in front‑end development using React and Web3 provider integrations
• Experience in designing high‑availability systems and real‑time transaction infrastructure
• Strong emphasis on security, performance, and scalability
• Excellent documentation and communication skills

What We Offer

• A dynamic and supportive work environment
• Opportunities for professional growth and development in a rapidly evolving industry
• Competitive salary and performance-based incentives
• The chance to work with a passionate team in the forefront of blockchain innovation