Principal Full Stack Developer (TypeScript)

In this role, you will act as a technical leader, shaping the future of our platform and mentoring the engineers around you. You’ll tackle our most ambiguous and challenging technical problems, ensuring our systems are scalable, reliable, and built for the long term.

Your mission might include:

• Driving the technical vision and architecture for our core product, working closely with our ML team to integrate new AI features.
• Leading the design and execution of large-scale technical projects, such as evolving our monorepo strategy or migrating a core service to a new architecture.
• Mentoring other senior engineers, elevating the team’s skills through code reviews, architectural guidance, and establishing best practices.
• Partnering with product and engineering leadership to identify and de-risk technical challenges in the product roadmap for the next 1-2 years.

How We Build: Our Engineering Culture

We believe in a calm, collaborative, and productive engineering environment. We trust our engineers and give them the autonomy to do their best work. Our approach includes:

• Agile & Fast-Paced: We practice trunk-based development with daily releases to get value into our users’ hands quickly.
• Quality by Default: We maintain a comprehensive Cypress E2E test suite and enforce strict typing, linting, and formatting rules to keep our codebase clean and maintainable.
• DevOps Mindset: Our well-oiled CI/CD pipeline deploys to AWS via Kubernetes, with our entire infrastructure managed as code using Terraform.
• Collaboration & Transparency: We value open discussion, constructive code reviews, and a culture where the best idea wins, regardless of who it comes from.

We’re looking for a seasoned technical leader who is passionate about building great products and great teams. You’ll be a great fit if you have:

• Extensive experience (typically 10+ years) in software engineering, with a proven track record of architecting and delivering complex, scalable web applications.
• Deep, system-level expertise in our core technologies (TypeScript, Node.js, React) and the ability to reason about the entire stack, from the database to the browser.
• A history of leading complex technical projects and making critical architectural decisions.
• A passion for mentoring and technical leadership. You find joy in helping other engineers grow and in elevating the technical bar for the whole team.
• Excellent communication skills in English, with the ability to articulate complex technical concepts to both technical and non-technical audiences.

• Competitive Compensation: A competitive salary above the market average.
• Work-Life Balance: Choose to work 100% remotely or from our modern office in Berlin. We offer flexible working hours to fit your life.
• Top-Notch Equipment: A new MacBook Pro to ensure you have the best tools for the job.
• A Great Team: Regular company off-sites and team events that connect us as people, not just colleagues.
• Job Security: A permanent contract in a stable, well-funded company.

Cosuno - Revolutionizing construction through technology.

We are Cosuno - a fast-growing tech startup that is making the construction industry more efficient and transparent with our digital platform for tenders and procurement processes. Our goal: to solve the most complex challenges in the industry with innovation and simplicity.

Why Cosuno?

Artificial intelligence is the key to our solution: it analyzes millions of price data points and helps construction companies create precise and efficient bids. This not only saves our customers time but also helps them avoid unnecessary costs.

But for us, it’s not just about technology - it’s about the people who drive it. At Cosuno, you will work with creative minds who are reshaping the construction industry. We believe in diversity because we know that the best ideas come from different perspectives. An integrative and inclusive work environment is a matter of course for us.

Join us - Build the future of construction.