LEAD SOFTWARE ENGINEER (M / F / D) KOTLIN

interim Group; Jena; Vor Ort; EUR 75.000 - 100.000; Vollzeit

Zusammenfassung

A leading company in breakthrough innovations seeks a Lead Software Engineer focused on Kotlin to shape the future of secure digital identity in Europe. You will lead an agile development team, responsible for backend architecture and code quality of a digital wallet solution. Join a mission-driven work culture that connects science, business, and administration.

Leistungen

Flexible working hours

Remote work options

Access to conferences

Team events

Supportive work culture

Qualifikationen

• 10+ years of experience in back-end development.
• 3+ years in technical leadership roles.
• Fluency in English; German is a plus.

Aufgaben

• Take technical ownership of Kotlin's backend services.
• Lead and mentor a cross-functional team.
• Make architectural decisions and support recruitment.

Kenntnisse

Back-end development

Kotlin

Modern backend architecture

DevOps

Agile mindset

Strong communication skills

Tools

Spring framework

Cloud-native operations

Jobbeschreibung

We are looking for people who want to shape the future with us. As part of SPRIND, an organization that is called the Federal Agency for Breakthrough Innovations but thinks like a start-up. Our goal is to create new breakthrough innovations from Germany. That means products, services and systems that make all of our lives noticeably and sustainably better. To do this, we connect new thinkers from science and business, people with outstanding ideas, special expertise and passion.

In the EUDI Wallet Ecosystem project, which SPRIND is carrying out on behalf of the newly formed Federal Ministry of the Digitalization and State Modernization (BMDS), a concept for a German implementation of the EU eIDAS 2.0 regulation including a digital wallet is being developed and tested. Representatives of organized civil society, business associations and administration as well as experts from science are involved in a public consultation process that accompanies the project. Mid-term this project will be transformed into a to-be-founded government-owned entity that takes over the EUDI Ecosystem for the permanent further development and operation of the platform.

Tasks

As a Lead Software Engineer with a focus on Kotlin, you will take technical ownership of an agile development team and shaping the future of secure digital identity in Europe. You’ll play a key role in designing and building the backend architecture of a high-trust digital wallet solution used across regulated, privacy-sensitive domains.

Your Responsibilities

Take technical ownership of the development and evolution of the Kotlin-based wallet’s backend services, including :

Remote trust anchor (Cloud HSM) integration

Wallet and credential lifecycle

Vulnerability management

System telemetry and statistics

Lead and mentor a cross functional team incl. front-end-, back-end-, QA-, UX / UI-, system-engineers

Ensure clean, well-tested code and continuous integration

Make architectural and technology decisions in coordination with our product owner

Support the recruitment and onboarding of technical talent

Requirements

• At least a decade of professional experience in back-end development incl. 3+ years with Kotlin and in a technical leadership role as well
• Strong proficiency in Kotlin and solid understanding of modern backend architecture (e.g., microservices, REST, event-driven design)
• Experience with Spring framework (with Kotlin)
• Deep knowledge of modern cryptography, secure protocol implementation, and identity management standards
• Knowledge of Hardware Security Modules and cryptographic key management is a plus
• Hands-on experience with DevOps, CI / CD pipelines, and cloud-native operations
• Agile mindset (Scrum / Kanban), strong communication skills, and a collaborative spirit
• Fluent in English; German language skills are a plus
• A chance to shape one of Germany’s most important digital public infrastructures
• A forward-thinking, mission-driven work culture at the intersection of science, administration, and innovation
• Attractive compensation based on the responsibility of the position
• Flexible working hours and remote work options
• Access to conferences, team events and a supportive work culture
• The attractive remuneration is based on the responsibility of the position.
• Location : remote (occasional travel to other locations within Germany)
• Contract : Initially limited until December 2026 (The plan is to continue the contracts thereafter.)
• Start Date : As soon as possible

We look forward to receiving your application.

With the interim Group you get the correct talents, who really fit to the positions and that without a success commission.

Lead Software Engineer • Jena, Thuringia, Germany