Back End Developer

We're building the core of a modern accounting platform, EasyBiz, and we need a strong Senior Backend Engineer to help us do it.
In this role, you’ll take ownership of complex backend features: from reporting systems and workflow automations to the key logic that powers our product. You’ll work in a fast-moving team, supporting a junior engineer and collaborating directly with product and design. We’re looking for someone who can lead by example, write clean, scalable code, and ship features that make a difference.This is a great opportunity for someone who thrives on technical ownership and enjoys shaping early-stage product architecture. If you're passionate about backend systems and want to build something meaningful in the fintech space, we'd love to talk.

Responsibilities:

• Own the backend development of key features: accounting reports, workflow automation, and data processing;
• Build and maintain scalable REST APIs using TypeScript and PostgreSQL;
• Mentor a junior backend engineer and support their growth;
• Collaborate closely with product managers and designers to turn business needs into working code;
• Ensure high-quality code through testing (e.g. Jest) and peer reviews;
• Take responsibility for project delivery from concept to production, including CI/CD and post-launch support.

Requirements:

• 7+ years of backend development experience;
• Expert knowledge of TypeScript (Nest.js preferred), Node.js; PostgreSQL
• Experience designing scalable systems and building clean, well-documented RESTful APIs;
• Comfortable working autonomously and leading projects end-to-end;
• Solid understanding of backend architecture, system design, and test-driven development;

Nice to Have:

• Experience with ORMs like TypeORM or Prisma;
• Familiarity with event-driven architecture and message queues (e.g. RabbitMQ, Kafka);
• Experience with CI/CD tools (e.g. GitHub Actions), Docker, or basic DevOps tasks;
• Background in fintech or accounting systems.

Benefits and Compensation:

• Competitive salary based on experience;
• Strong project and product cultures;
• Ability to work with EU markets;
• Minimal bureaucracy;
• Flexible working hours;
• Opportunities for professional growth and development in an entrepreneurial environment.

Company culture and values:

3F Venture creates conditions for the effective commercial implementation of projects by dividing its resources between different projects. We launch startups in various fields such as EdTech, SocialTech, AI, computer vision, and markets including the EU, US, and Asia. In other words, we are a business that creates other businesses.

At 3F, we foster a culture of innovation, collaboration, and continuous learning. We empower team members to take ownership of their projects and contribute to the success of our ventures. We value integrity and a passion for driving positive change in the industries where we operate.

We prioritize attention to detail, clarity, and performance.

Learn more at https://3f.lu/

How to apply

• Share your CV and LinkedIn or fill the form below;
• Send your application via email: [email protected]