Backend and Blockchain Developer

Backend and Blockchain Developer (Freelance) - Ongoing - Dubai-Belgium

At RELYzIT Talent, we don’t recruit — we build. We place elite engineers and product minds into mission-critical roles across Infrastructure, Security, Data, Applied AI, and Product Development in the EU and GCC. Every placement is about real outcomes, not just filling seats. All candidates are vetted through our AI-driven, multi-layered 7-Signals Talent Engine™ — ensuring every professional we back is a precision-fit, high performer. If you’re a builder, not a clock-puncher, you’re in the right place.

About the Role

Our client is seeking a Freelance Backend and Blockchain Developer to drive the final integration and secure delivery of a next-generation platform. You’ll work at the intersection of backend engineering and blockchain, collaborating closely with Design, Frontend, and the CTPO to ensure seamless, secure, and scalable solutions. This is a freelance, remote-first opportunity with immediate impact — perfect for builders who thrive on ownership and rapid delivery.

Why This Role Matters

This role is pivotal in bringing a high-stakes product to life. You’ll be responsible for ensuring robust backend integrations, secure access controls, and flawless end-to-end testing. Your work will directly influence the platform’s reliability, security, and user experience — making you a key driver of business outcomes and client success.

Key Responsibilities

• Finalize backend integrations, ensuring Stripe payment APIs sync accurately with status APIs
• Validate ticket data and status fields across all user flows
• Set up secure, role-based credential logic for Admin, Organizer, Partner, and Consumer roles
• Implement Twilio Chat APIs, scoped per user role and context
• Refactor and consolidate backend endpoints under api.[domain].io
• Support full QA and end-to-end testing in collaboration with Design, Frontend, and Product teams
• Collaborate daily with cross-functional teams to ensure alignment and rapid delivery

Technical Skills

• 5+ years of backend development experience with Node.js, REST APIs, and serverless architecture
• Proven expertise with Solana, including NFT creation and transaction workflows
• Strong understanding of Firebase Authentication and secure role-based access design
• Experience integrating Stripe and chat/messaging APIs (e.g., Twilio)
• Hands-on knowledge of Azure Functions and debugging production APIs is a plus
• Familiarity with Azure Cosmos DB, Firebase (Auth via Social + Wallets), Stripe, Revolution, Twilio Chat, and Azure Cloud

Language Proficiency

• Professional proficiency in English (written and spoken) is required

Other Requirements

• Excellent communication skills and ability to work cross-functionally
• Strong ownership mindset and a drive for delivering real impact
• Comfortable working in fast-paced, collaborative environments
• Immediate availability for project start
• Freelance contract with a target delivery window of 2–3 weeks
• Remote work — collaborate with teams across the EU and GCC

Ready to build with us?

Upload your CV, GitHub, relevant project links, and your start availability. Join a network where every placement is about purpose, impact, and building what matters.

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