Senior Backend Developer – Developer Platform
First seen by Alion on Nov 13, 2026.
Ignite the Future of Developer Platforms — Shape Scalable, Enterprise-Grade Solutions!
Kraków-based opportunity with hybrid work model (up to 3 days remote/week)
As a Senior Backend Developer, you will be working for our client, a leading financial institution, pioneering the development of a cutting-edge internal developer platform. This long-term, multi-year project aims to revolutionize how teams deliver and host their projects at enterprise scale, employing innovative technology akin to Vercel, Heroku, and Coolify. Your expertise will directly impact the creation of a world-class developer experience, fostering agility and efficiency across global teams.
Your main responsibilities:
Design, develop, and maintain backend services and platform components to ensure robustness and scalability
Collaborate with senior management and large developer teams to define platform strategy and drive delivery
Contribute to architectural decisions and establish platform standards to support enterprise needs
Engage with stakeholders at all levels to gather requirements and communicate technical progress effectively
Work across multiple languages and technical domains, applying best practices in development and DevOps
Participate in code reviews, testing, and documentation to uphold high-quality standards
Maintain a strong focus on security, performance, and maintainability of platform components
You're ideal for this role if you have:
At least 5 years of professional experience in backend development within enterprise or platform environments
Strong proficiency in Java, Kotlin, or Node.js (at least one is a must)
Excellent communication skills, capable of engaging both senior management and large developer communities
Self-driven attitude with the ability to work independently in a hybrid setting
Familiarity with building or working on developer platforms or internal tooling is an advantage
Experience working in internationally distributed teams
It is a strong plus if you have:
Hands-on experience with platforms such as Vercel, Heroku, or Coolify
Background in DevOps or infrastructure-as-a-service (IaaS) solutions
Language required for the role:
Fluent English
Eligibility to work in Europe:
Only candidates with an existing legal right to work in the European Union will be considered for this role
#MAKEYourCareerBETTER
Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.
Tech stack
- Java
- Kotlin
- Node.js