Backend Developer

The company

With 80+ employees across offices in Zagreb, Novi Sad, and remotely, we’re building Solflare, the most powerful wallet on Solana. Trusted by 3M+ monthly users and holding $20B+ in assets, our mission is to make cryptocurrency secure, intuitive, and accessible. We’re pushing the industry forward by challenging assumptions, turning advanced cryptography into seamless experiences, and building lasting infrastructure.

The culture

At Solflare, we’re a team of high-performing builders who thrive in a fast-paced, high-impact environment. Success isn’t about individual stars—it’s about how we execute together. Ownership, accountability, and technical excellence drive us, and we push ourselves (and each other) to be the best. We challenge assumptions, move fast, and focus on real solutions. If you’re an expert in your craft, you’ll have the autonomy to make a real impact. We don’t do half-measures—at Solflare, second best is never an option.

The role

As a 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 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 Cloud Platform, DigitalOcean) and DevOps practices.
• Strong understanding of test-driven development (TDD) and experience with Jest.
• Knowledge of event-based architecture, microservices design patterns and ability to design scalable systems.
• Excellent problem-solving skills and attention to detail.
• Strong communication and collaboration skills.

Nice to Haves

• Familiarity with blockchain technologies, specifically Solana, is a plus.
• Proficiency in machine learning concepts and experience in applying them to real-world problems.
• Experience in designing and optimizing backends to handle large volumes of data efficiently.

Personality Traits We Value

• Empathetic & Approachable: You genuinely care about the well-being and success of your teammates. You’re open to feedback and always willing to lend a helping hand.
• Curious & Forward-Thinking: You love learning new tools and techniques and are always looking for ways to improve the product and the team’s workflow.
• Pragmatic Problem-Solver: You know when to innovate and when to keep things simple, finding the right balance between ideal solutions and practical constraints.
• Calm Under Pressure: You stay composed and focused on finding solutions, even when facing tight deadlines or challenging problems.
• Collaborative & Inclusive: You value diverse perspectives and actively encourage team members to contribute their ideas.
• Humble & Self-Aware: You recognize that there’s always room to grow and are committed to continuous improvement, both personally and for your team.

Why Solflare?

• Make an impact: Your work will directly shape how people interact with and understand crypto wallets, empowering users around the globe.
• Work with the best: Collaborate with a talented, driven team across design, engineering, and product to build innovative, user-first experiences.
• Flexibility: Remote or office – up to you. Enjoy a flexible work environment based on trust that supports your well-being and fosters creativity, as well as flexible work time – work when you are most productive, with no micromanagement
• Perks& benefits: individual education budget, cool team buildings, private health insurance, to name a few
• Learn about Crypto: No crypto experience? No problem! You’ll be part of a team that will teach you the ropes and help you grow into an expert.

Join us at Solflare and be part of something bigger than yourself. We’re not just reacting to trends; we’re building the future. If you’re ready to push boundaries, challenge assumptions, and make an impact, we want to hear from you.

Apply now and help us shape the future of decentralized finance.