Backend Developer

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 Cloud Platform, DigitalOcean) and DevOps practices.
• 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 Have:

• 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

• Problem-solvers: You see roadblocks as opportunities and don’t wait around for someone else to fix things.
• Self-starters: You take initiative, follow through, and deliver with pride - no excuses, no shortcuts.
• Team players: You thrive in a “we, not me” culture, lifting others up while sharing the load.
• Adaptable minds: You embrace change, question how things are done, and constantly look for better ways.
• Ownership mindset: You own your work end-to-end, communicate openly, and learn from every challenge.

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.