Senior Full Stack Developer (TypeScript)

Cosuno

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Location: Berlin, Germany
Job Type: full-time
Work Format: 🌍 Remote
Salary: €80K – €100K
Posted: May 24, 2026

Job Description

Your mission

As a key member of our Engineering team, you won't just be writing code—you'll be solving complex problems and taking full ownership of features from concept to deployment. You will have a direct impact on a product used by thousands of construction professionals to build the world around us.

In your first few months, you might:

Design and build new AI features, such as our recently launched AI agent for editing BoQs or automated AI bidder recommendations
Collaborate with product managers and designers to shape the user experience and technical direction of our core product.
Architect and implement modular packages and services in our monorepo to improve the structure and maintainability of our codebase

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.

Your profile

We're looking for an experienced engineer who is passionate about building great products. You'll be a great fit if you have:

Significant professional experience building, shipping, and maintaining complex web applications using TypeScript.
Deep expertise in Node.js for backend development and a strong command of React for the frontend.
A pragmatic approach to problem-solving and a high sense of ownership, feeling comfortable driving projects independently.
Experience working in collaborative, agile product teams.
Excellent communication skills in English.

Bonus Points For (Nice-to-Haves):

Experience with our infrastructure stack (AWS, Kubernetes, Terraform).
Experience with building and maintaining CI/CD pipelines.
An interest in data engineering or machine learning.

Why us?

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.

About us

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.

🎯 Who is this job for?

This role is best suited for a Senior Full-Stack Developer with strong experience building and maintaining complex TypeScript applications across both frontend and backend systems. The candidate should have deep expertise in Node.js and React, understand software architecture, CI/CD, testing, and scalable cloud environments, with bonus exposure to AWS, Kubernetes, Terraform, AI/ML, or data engineering workflows. They should thrive in an autonomous product-focused team, take ownership of features from design to deployment, and be comfortable building AI-powered functionality in a fast-moving startup environment.

💬 Potential Interview Questions

How would you structure a large TypeScript monorepo for scalability and maintainability?
I would organize the monorepo into modular packages with clear ownership boundaries, shared libraries, and isolated responsibilities. Strong typing and consistent standards help maintain long-term maintainability.
How would you design and integrate AI-powered features into an existing product?
I would begin with clear use cases, create APIs or services around AI functionality, validate outputs carefully, and ensure monitoring, reliability, and feedback loops for continuous improvement.
What are the advantages of trunk-based development?
Trunk-based development reduces long-lived branch complexity, encourages smaller changes, and supports faster and safer deployments through continuous integration.
How do you ensure code quality in a fast-moving engineering environment?
I rely on strong TypeScript typing, automated testing, linting, code reviews, and CI/CD pipelines to maintain consistency and prevent regressions.
How would you approach designing scalable Node.js backend services?
I would focus on modular architecture, separation of concerns, asynchronous processing where appropriate, observability, and designing APIs that can evolve over time.
How do Cypress end-to-end tests fit into an application's testing strategy?
Cypress helps validate complete user workflows from the frontend through backend interactions. I usually combine E2E tests with unit and integration testing for broader coverage.
What role do Kubernetes and Terraform play in modern DevOps workflows?
Kubernetes handles container orchestration and scaling, while Terraform manages infrastructure as code, improving repeatability and reducing manual deployment errors.
How would you optimize React application performance in a complex product?
I would profile the application, reduce unnecessary renders, use memoization where appropriate, optimize state updates, and implement lazy loading or code splitting.
How do you handle technical decisions when working with product managers and designers?
I focus on understanding business goals, discussing tradeoffs openly, and balancing technical constraints with user experience and delivery speed.
What qualities are important for a senior engineer working in an autonomous product team?
Ownership, communication, sound technical judgment, independent problem-solving, and the ability to deliver reliable solutions while collaborating effectively are essential.

📋 Job Summary

Cosuno is hiring a Senior Full Stack Developer to help transform the construction industry through AI-powered technology used by thousands of professionals worldwide. In this remote or Berlin-based role, you’ll work across the stack with TypeScript, Node.js, React, AWS, Kubernetes, and Terraform to build AI-driven features, scalable services, and production systems that directly shape the company’s core product. You’ll join a collaborative engineering culture focused on daily releases, strong code quality, DevOps practices, and meaningful ownership from idea to deployment. With a salary of €80K–€100K, flexible remote work, top-tier equipment, and the opportunity to build AI solutions that solve real-world industry problems, this is an exciting role for engineers who want impact, autonomy, and modern engineering practices.