Senior Backend Developer

About the role

Solflare, a Solana self-custody wallet with around 4 million users, is hiring a Senior Backend Developer in Zagreb. You will develop and maintain the backend infrastructure of its applications, ensuring high performance, security and scalability, and work closely with the engineering team on the technical challenges of a crypto wallet.

Key responsibilities

• Design and implement scalable, robust backend services and a microservices architecture.
• Develop APIs and integrate third-party services and Solana RPCs.
• Manage databases (PostgreSQL, MongoDB) and ensure data integrity and security.
• Implement caching with Redis and use PrismaJS for database access.
• Deploy and manage applications on DigitalOcean and Google Cloud Platform.
• Use BullJS for background jobs and Cron for scheduled tasks.
• Write unit and integration tests with Jest.
• Collaborate with frontend developers and stay up to date with web and blockchain trends.

Required profile

• At least 4 years of backend development experience focused on web2/web3 technologies.
• Experience with cloud services and DevOps practices.
• Knowledge of event-based architecture, microservices patterns and scalable system design.
• Excellent problem-solving, communication and collaboration skills.
• Nice to have: familiarity with Solana, machine learning concepts, and experience optimising backends for large data volumes.

Required skills

• Node.js, Express.js, PostgreSQL, MongoDB, Redis, PrismaJS
• Google Cloud Platform, DigitalOcean