Full Stack Java/Kotlin Developer (m/f/d)

GreenPocket GmbH

Full Stack Developer in a startup specializing in sustainable energy management software. Involved in product life-cycle from design to improvement with agile teams.

Posted 4/12/2026full-timeCologne • 🇩🇪 GermanyMid-LevelSeniorWebsite

Tech Stack

Tools & technologies

JavaJavaScriptKotlinMicroservicesSpringTypeScript

About the role

Key responsibilities & impact

Together with the development team, Product Owners and UX/UI designers, you drive the ongoing development of our SaaS solutions (in particular microservices)
You design, test, maintain and continuously improve the software both independently and within your team
You advise product management on technical questions and coordinate with them and the business units on functional and technical requirements and their implementation
In the DevOps area you will take on increasing responsibility for architecture, programming and testing
Through pair programming, code reviews and prototyping you will continuously develop not only our products but also your own skills
You regularly exchange ideas with our agile, cross-functional teams as part of “DevComs” or our Architecture Board
You look beyond your own area, implement your ideas during monthly GreenDays and have the opportunity to feed these ideas into product development

Requirements

What you’ll need

You have successfully completed a degree in an IT-related field or have comparable professional training that convinces us
In addition, you already bring initial experience as a software developer, ideally in a SaaS environment
You have practical experience with microservices and cloud infrastructures
You have strong Java or Kotlin knowledge, ideally within the Spring ecosystem. Alternatively, you shine with excellent JavaScript/TypeScript skills and have experience with common frameworks
You are familiar with and use standard tools, especially in agile environments, such as JIRA and Confluence, for development management and documentation
As a creative, analytical thinker you enjoy new technologies and bring a strong quality awareness
You live the startup mindset, are motivated and like to get things done directly
You have good German and very good English skills

Benefits

Comp & perks

Intensive coaching and training opportunities, plus participation in DevCom and the Architecture Board
A permanent employment contract with the opportunity to help shape the green startup scene
Startup atmosphere with lots of freedom to shape things, flat hierarchies and short decision paths
Flexible working hours and, of course, the option to work from home
Take your GreenDay! Leave the daily routine behind and dedicate one day a month entirely to your own ideas
Regular team events (bouldering, board and online game nights, etc.) and daily foosball tournaments with ambitious colleagues aka foosball pros
An office full of sprint memes and day-specific songs (e.g., Fridays always end with the “Good Vibes” playlist)
Unlimited coffee and water supplies and regularly fresh fruit
Conveniently located with excellent cultural, sporting and transport connections

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

JavaKotlinJavaScriptTypeScriptSpringmicroservicescloud infrastructuresoftware developmenttestingpair programming

Soft Skills

analytical thinkingcreativityquality awarenessmotivationstartup mindsetteam collaborationcommunicationproblem-solvingadaptabilityinitiative