Backend Developer

Remote / Croatia / Serbia • Full-time Backend Developer Apply for this job Apply for this job About us Solflare is one of the fastest-growing crypto wallets in the world. With around 4 million monthly active users and over $20 billion in digital assets secured through our platform, we’re building a powerful gateway to Web3. Founded in 2021, Solflare now has a team of nearly 150 people, with offices in Zagreb, Belgrade, and Novi Sad, plus remote teams across the globe. Our vision is simple but bold: a world where everyone uses a Web3 wallet and has full control over their assets – achieving true financial independence. Our culture At Solflare, we’re on a mission to empower people to truly own and thrive – starting with our own team. We take on bold challenges with curiosity, grit, and a deep sense of accountability. Here, progress means learning fast, solving smart, and showing up for each other without ego. You’ll join a team where we question the status quo, celebrate shared wins, and never settle for “just good enough.” If you’re excited by growth – yours, ours, and society’s – you’ll feel right at home. The role As a Senior Backend Developer , you will be responsible for developing and maintaining the backend infrastructure of our applications, ensuring high performance, security, and scalability. You’ll work closely with the rest of the engineering team to tackle complex technical challenges and build solutions that can handle the unique demands of a crypto wallet app.  Core responsibilities: Design and implement scalable and robust backend services. Develop APIs and integrate third-party services and Solana RPCs. Manage databases (PostgreSQL, MongoDB) and ensure data integrity and security. Implement caching mechanisms using Redis for improved performance. Work with PrismaJS for efficient database access and management. Deploy and manage applications on cloud platforms (DigitalOcean, Google Cloud Platform). Utilize BullJS for background job processing and Cron for scheduling tasks. Write unit and integration tests using Jest to ensure code quality and reliability. Collaborate with frontend developers and other team members to ensure seamless integration. Stay updated with the latest trends and technologies in web development and blockchain. Design and implement a microservices architecture for scalability and maintainability. Requirements: Minimum of 4 years of experience in backend development with a focus on web2/web3 technologies. Proficient in Node.js, Express.js, PostgreSQL, MongoDB, Redis, and PrismaJS. Experience with cloud services (Google C