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Principal Full Stack Developer (TypeScript)

Job Overview

Location

Berlin

Job Type

Full-time

Category

Full-Stack Engineer

Date Posted

March 3, 2026

Full Job Description

đź“‹ Description

  • • As a Principal Full Stack Developer at Cosuno GmbH, you will step into a pivotal technical leadership role, instrumental in defining and advancing the architecture and future direction of our innovative construction technology platform.
  • • You will be at the forefront of tackling our most complex and ambiguous technical challenges, ensuring that our systems are not only robust and scalable but also meticulously engineered for long-term sustainability and performance.
  • • A core aspect of your mission will involve driving the technical vision and architectural roadmap for our flagship product, with a significant focus on collaborating closely with our Machine Learning team to seamlessly integrate cutting-edge AI features that enhance our offering.
  • • You will take ownership of leading the design, development, and successful execution of large-scale, impactful technical projects. This could encompass strategic initiatives such as evolving our monorepo strategy to optimize development workflows or orchestrating the migration of a critical core service to a more advanced and efficient architecture.
  • • Your role extends to being a technical mentor and guide for other senior engineers. You will actively contribute to elevating the collective skill set of the engineering team through rigorous code reviews, providing insightful architectural guidance, and championing the establishment and adherence to best practices across the board.
  • • You will forge strong partnerships with product management and engineering leadership. This collaboration will be crucial for proactively identifying potential technical hurdles within the product roadmap for the upcoming 1-2 years, and for developing strategies to de-risk these challenges, ensuring smooth and predictable delivery.
  • • Our engineering culture is built on principles of calmness, collaboration, and productivity. We foster an environment where engineers are trusted and empowered with the autonomy to excel and deliver their best work.
  • • We embrace an Agile and fast-paced development methodology, utilizing trunk-based development and deploying daily releases to ensure that valuable features reach our users with maximum speed and efficiency.
  • • Quality is ingrained in our process by default. We maintain a comprehensive suite of Cypress End-to-End (E2E) tests and enforce stringent typing, linting, and formatting rules to guarantee a clean, maintainable, and high-quality codebase.
  • • We cultivate a strong DevOps mindset, supported by a highly optimized CI/CD pipeline that facilitates deployments to AWS via Kubernetes. Our entire infrastructure is managed as code, leveraging Terraform for consistent and repeatable deployments.
  • • Collaboration and transparency are cornerstones of our culture. We encourage open discussions, value constructive code reviews, and foster an environment where the most effective ideas prevail, irrespective of their origin.
  • • This role offers a unique opportunity to significantly influence the technical trajectory of a rapidly growing startup that is revolutionizing the construction industry through advanced technology and AI.
  • • You will be instrumental in building not just software, but also a high-performing engineering team, contributing to a culture of continuous learning and technical excellence.
  • • The impact of your work will be directly felt in the efficiency and transparency of construction procurement processes, making a tangible difference in a traditionally complex industry.
  • • You will have the chance to work with a diverse and creative team, contributing to an inclusive environment where different perspectives are valued and lead to innovative solutions.
  • • Your technical leadership will be key in navigating the complexities of integrating AI-driven insights into our core product, providing substantial value to our customers.

Skills & Technologies

JavaScript
TypeScript
React
Node.js
AWS
Full Stack
Senior
Remote

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About Cosuno GmbH

Cosuno is a leading digital platform revolutionizing the real estate industry by connecting real estate agents with qualified buyers. The company streamlines the sales process, offering a comprehensive solution for lead generation, qualification, and management. Cosuno's technology empowers agents to focus on closing deals rather than spending excessive time on administrative tasks. By leveraging data and automation, Cosuno aims to increase efficiency and transparency in real estate transactions, making the buying and selling process smoother and more effective for all parties involved. They operate within the PropTech sector, driving innovation in how real estate is bought and sold.

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