Blockchain/ Web3 Node.js Developer (iGaming)
SweepTech iGaming SolutionsUkraine32 days ago
Full-timeRemote FriendlyEngineering, Information Technology
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About Us
We are a well-funded iGaming startup on a mission to redefine the future of online gambling. Built on a foundation of transparency, integrity, and responsible gaming, our next-generation SaaS platform empowers operators to launch and scale dynamic casino experiences with unmatched speed and confidence.
Our cutting-edge technology consolidates a vast portfolio of game mechanics into a single, unified ecosystem. We provide operators with advanced data analytics and customizable tools designed to boost profitability, enhance player engagement, and drive sustainable growth.
We're not just building a platform; we're advancing industry standards. By prioritizing fairness and pioneering responsible gaming practices, we create value for operators while ensuring a safer, more trustworthy experience for players worldwide.
Join us to shape the next evolution of iGaming!
Job Summary
As a Blockchain/Web3 Node.js Developer, you'll lead the development of a secure, high-throughput in-house crypto payment processing system for our cutting-edge Game and Entertainment Platform. You'll own the end-to-end architecture, from hot-wallet key management and bulk on-chain transfers to monthly SLA reporting, supporting thousands of concurrent transactions.
Required Qualifications
We are a well-funded iGaming startup on a mission to redefine the future of online gambling. Built on a foundation of transparency, integrity, and responsible gaming, our next-generation SaaS platform empowers operators to launch and scale dynamic casino experiences with unmatched speed and confidence.
Our cutting-edge technology consolidates a vast portfolio of game mechanics into a single, unified ecosystem. We provide operators with advanced data analytics and customizable tools designed to boost profitability, enhance player engagement, and drive sustainable growth.
We're not just building a platform; we're advancing industry standards. By prioritizing fairness and pioneering responsible gaming practices, we create value for operators while ensuring a safer, more trustworthy experience for players worldwide.
Join us to shape the next evolution of iGaming!
Job Summary
As a Blockchain/Web3 Node.js Developer, you'll lead the development of a secure, high-throughput in-house crypto payment processing system for our cutting-edge Game and Entertainment Platform. You'll own the end-to-end architecture, from hot-wallet key management and bulk on-chain transfers to monthly SLA reporting, supporting thousands of concurrent transactions.
Required Qualifications
- 5+ years of professional back-end development experience with Node.js and TypeScript in production environments.
- Deep familiarity with different blockchain protocols and standards, including gas/bandwidth/resource models.
- Hands-on experience with web3.js, ethers.js, TronWeb, and CCXT libraries.
- Hands-on experience with integration of RPC Node Providers (e.g., GetBlock, Infura, Alchemy, Quicknode) for cross-chain operations (ERC-20/BEP-20/TRC-20 tokens).
- Proven track record designing high-throughput crypto processing systems with precise nonce and concurrency control.
- Solid understanding of cryptographic key management best practices (hot wallets, KMS/Vault, HSM, multi-sig).
- Ability to troubleshoot complex blockchain issues - gas volatility, reorgs, token approvals, API rate limits, TRON resource constraints.
- Fluency in Ukrainian or Russian and proficiency in English for technical collaboration in a remote/global team setting.
- Ability to work within the CET/EET time zone.
- Architect and build a high-throughput crypto payment processing engine in Node.js, handling multiple coins (BTC, ETH, BNB, TRX, …) and tokens (ERC-20, BEP-20, TRC-20) transfers.
- Integrate with self-custodied hot wallets; securely manage private keys (AWS KMS, HashiCorp Vault, HSM, etc.).
- Implement nonce management, gas optimization, and on-chain batch-transfer contracts.
- Develop reconciliation logic using both on-chain data and off-chain data from CEXs/DEXs and Oracles.
- Design retry strategies, error handling, and idempotent workflows for failed or reverted transactions.
- Monitor system health, log all activities, and produce monthly SLA reports, tracking success rates, confirmation times, and uptime.
- Application Review
- Interview Stages (2-3 weeks)
- Prescreen Call with Recruiter - 30 min.
- Technical Interview with Software Architect and CPO - 1.5-2 hr.
- Job Offer
- Referrals: Employment and Background Check Compensation: Up to $5,000 gross per month, depending on experience and qualifications.
- Competitive compensation package (depends on your experience and skills).
- Fully remote work with flexible hours (within the CET/EET time zone) from any location of your choice.
- 29 business days of vacation and paid sick leave.
- Corporate equipment (laptops, monitors, etc.).
- Professional courses/certifications (200 EUR per year).
- Operating in a start-up environment with cutting-edge technologies and unlimited investments in software upgrades, free from legacy systems or outdated solutions.
- Values-driven culture with a friendly and supportive work environment.
- Matrix organizational structure designed to streamline communication, remove barriers, and promote efficiency.
Key Skills
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