Lead Full Stack Developer
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Update day: 26-11-2025
Category: Executive management Mechanical / Technical Maintenance
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At Kosy, we are a strong product organization where our users need to be top of mind for everyone within the organization so we can build the greatest product.
Our roadmap is exciting and includes items such as building highly scalable media servers, developing a 3rd party application ecosystem, developing a set of mini-games, or implementing AI data-crunching algorithms.
We are looking for a strong software developer to help us further develop our core SaaS product. You will be part of a product squad consisting of developers, a designer, a product owner, and a tester. You get to work directly with the co-founders to create a high-quality product from both a technical and a functional perspective.
What will your main responsibilities be?- Design, develop, and deliver new features within a robust, lasting, and scalable product
- Take part in the agile process (standups, retrospectives, etc.)
- Contribute to the continuous evolution of product functionalities that work at scale
- Write code that is high-quality, performant, sustainable, and testable (while holding yourself accountable for the quality of the code you produce)
- Iterate quickly without compromising quality
- Take part in the planning process (estimations, sprint planning, technical analysis, etc.)
- Contribute to architecture & design discussions as needed
- Collaborate with testers, designers, developers, product owners, etc.
- Take some responsibility based on interests (DevOps, test automation, UX/UI, release management, framework, coaching juniors, analysis, data crunching, etc.)
- Bachelors/Masters degree in software/computer engineering
- 5+ years experience in a relevant software developer position
- Excellent English communication skills
- Motivation to deliver great products - Our customers should love to be our customers
- Team spirit and interpersonal skills
- Someone working near the GMT/CET time zone (preferably Europe).
- Experience and/or a strong interest in most of the technologies from our tech stack
- Mongo
- Serverless
- Docker
- React (Typescript)
- Node.JS (Typescript)
- AWS (Lambda, DocumentDB, EC2, ALB, S3, SNS, SQS, etc.)
- CQRS
- DDD
- Microservices
- WebRTC
- The ability to work 80-100% remote (post-covid)
- A front-row seat in a high-potential and high-growth startup going for the moon and seeking to change the way we work as a society
- A team of highly motivated and skilled professionals
- A company culture that believes that product quality is essential to survival
- Access to high-quality co-working space along with a network of other startups
- Open to full remote/work from anywhere working models! (Meet-ups 1-4x / year)
- High-end Dell or Apple laptop
- An ambitious roadmap with many technologically interesting features
If you meet most of the criteria, great! If not, just bring motivation to learn the rest! Your tasks, responsibilities, and role will be completely driven by your ambition and expertise.
Deadline: 10-01-2026
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