Product Engineer - Backend (all genders)

koppla is building the next-gen collaborative scheduling platform for construction, helping project managers keep projects on time by identifying delays and disruptions before they impact timelines.

We are looking for a product-minded Product Engineer - Backend in Berlin that loves building actual products while taking ownership for the entire feature building process. You will be mostly working on our TypeScript-codebase, while also working with and improving our existing codebase together with our SRE. This is a unique opportunity for taking a huge career step as the first backend-focussed Product Engineer of koppla.

Compensation: €70k-85k + 25% of your base salary in equity on top
Location: Berlin (Hybrid, 2+ days/week in office)

• Collaborate closely with product managers, designers, and frontend engineers to design and implement new features in a truly cross-functional process.
• Build and maintain backend services and APIs (REST/GraphQL) to support user-facing features.
• Contribute to the development and optimization of our real-time messaging backend (Websockets, Kafka, ...) that powers real-time collaboration.
• Be part of improving our infrastructure setup in AWS (S3, Dynamo, RDS, ECS, IAM, CloudWatch, Lambda, etc.) using IaC tools like Terraform or Serverless.
• Help improve observability, monitoring, and alerting for our services to ensure reliability and quick response to incidents (Sentry, CloudWatch, OpenSearch).
• Collaborate with senior engineers to implement best practices for software development, infrastructure, and deployment processes. Participate in code reviews and provide constructive feedback to peers while learning from more experienced engineers.

Stack: NodeJS, TypeScript, AWS, GraphQL (Apollo), PostgreSQL, Terraform, Kafka. You should be familiar with some of these or similar technologies.

This role is perfect for a backend engineer with 3-5 years of experience looking to grow their skills and make a meaningful impact at a company that is approaching product-market fit (> €2M ARR). You are likely a great fit if:

• You have solid engineering fundamentals, write clean and efficient code, and are eager to continue improving your skills.
• You understand how to balance technical trade-offs and can contribute to discussions about scalability, performance, and maintainability.
• You care about building reliable, high-quality systems that deliver a great experience for end users.
• You thrive in a fast-paced startup environment, enjoy taking ownership of your tasks, and stay proactive and pragmatic in solving challenges.

1. Initial Interview (with People & Culture - Basic Culture Fit, Expectations, General Screening)
2. Coding Challenge with Coderbyte
3. Technical Interview
4. Founder Interview (Meet the Founders - Mindset, Strategy, Culture Fit)
5. Reference Call (we would like to speak to one of your Line Managers from one of the last positions and will ask for contact details)