Backend Engineer (All Genders)

About the role

We are looking for a Backend Engineer (all genders) to join koppla GmbH, a fast‑growing construction‑tech startup approaching product‑market fit. The role is ideal for a full‑stack engineer with 3‑5 years of experience who wants to impact a high‑growth product and work in a collaborative, cross‑functional environment.

Key responsibilities

• Collaborate with product managers, designers and engineers to design and implement new features.
• Build and maintain backend services and APIs (REST and GraphQL) and contribute to the user‑facing Vue components.
• Contribute to the overall system architecture and ensure scalability, performance and maintainability.
• Work closely with senior engineers to adopt best practices for development, infrastructure and deployment.
• Participate in code reviews, provide constructive feedback and continuously improve code quality.

Required profile

• Solid engineering fundamentals with a habit of writing clean, efficient code.
• Flexibility to switch between front‑end and back‑end tasks as needed.
• Ability to balance technical trade‑offs and discuss scalability, performance and maintainability.
• Commitment to building reliable, high‑quality systems that deliver great user experiences.
• Thrives in a fast‑paced startup, takes ownership of tasks and aligns with our culture of transparency and collaboration.

Required skills

• Experience with RESTful APIs.
• Experience with GraphQL.
• Familiarity with Vue.js for front‑end development.

What we offer

• Equity grants through tax‑optimized shares, making you a co‑owner.
• 28 days of paid time off, flexible working hours, work‑ation options and a hybrid work model.
• Dog‑friendly office in Berlin with free lunch, beverages, snacks and a home‑office budget.
• Annual personal training budget of €1,500, company‑supported pension scheme (30 % contribution), Urban Sports Club membership and additional home‑office support.