Senior Fullstack Java Developer – Frankfu...

Senior Fullstack Java Developer – Frankfurt

Start ASAP – 2 days per week onsite in Frankfurt required.

Location: Frankfurt Germany (Hybrid) 2‑3 days per week onsite.

Type: Contract.

Seniority Level

High (Level3) – requires a minimum of 8 years experience in software development. Level3 developers have comprehensive knowledge of the client’s business domain and are expected to anticipate challenges, take responsibility for delivering high‑quality results, manage risks, and contribute to long‑term technical planning in alignment with project objectives.

Required Skills & Qualifications

Essential Skills and Qualifications

• Full‑stack Java development expertise: Experience across the entire software development lifecycle for Java‑based backend systems, using frameworks such as Spring Boot, Hibernate, or Micronaut.
• API & microservices development: Proven knowledge in building scalable, secure, and efficient RESTful APIs and microservices architectures; integrating databases (e.g. MySQL, PostgreSQL, MongoDB) and third‑party services into backend systems.
• Web front‑end proficiency: Ability to design and develop intuitive, responsive web user interfaces, with strong skills in HTML5, CSS3, JavaScript, and modern front‑end frameworks like React, Angular, or Vue.js.
• DevOps and cloud CI/CD skills: Experience implementing and managing DevOps practices on cloud platforms – including creating CI/CD pipelines, using infrastructure‑as‑code tools (e.g. Terraform), and containerization with Docker/Kubernetes for scalable deployments.
• Agile methodology experience: Demonstrated experience delivering software projects using agile frameworks (preferably SAFe, Scrum, and/or Kanban), collaborating effectively in iterative development environments.
• Automated testing expertise: Proficiency in the full testing lifecycle – including design, development, and maintenance of automated end‑to‑end tests for large‑scale systems, using frameworks such as Selenium or Robot Framework.
• Key Responsibilities: Software developers at Level3 are expected to perform advanced development and technical leadership tasks to ensure successful delivery of the project’s software components.

Key Responsibilities

• Design, development, and maintenance of core systems – Lead the implementation of complex software solutions in line with CLIENT requirements. Level3 developers will architect and code major features of the digital euro testing support tools, ensuring well‑engineered, secure, and efficient backend services and web portals. They design technical solutions, write and review code, and guide the overall architecture of the deliverables.
• End‑to‑end software engineering – Oversee the full development lifecycle: from refining specifications and developing new functionalities, to conducting thorough unit and integration testing, bug fixing, and performance optimization of the applications. Level3 developers also set up and improve CI/CD pipelines and DevOps processes to automate builds, testing, and deployment.
• Technical oversight and team guidance – Provide technical leadership and mentoring for the development team. A Level3 developer is expected to coordinate with other team members (including Level2 developers) to ensure code quality and alignment with best practices. They proactively identify critical problems or architectural challenges, develop innovative solutions, and ensure that the team’s work meets the project’s quality standards and deadlines.
• Collaboration and reporting – Work closely with the CLIENT’s Digital Euro project team and other stakeholders. This includes participating in design and planning workshops, closely collaborating with internal and external partners (e.g. National Central Banks, PSPs, and other service providers) for integration needs, and contributing to regular progress meetings and reports. Level3 developers often act as key points of contact for technical matters and help the Contractor’s contract manager coordinate complex development tasks.
• Expected Deliverables/Outputs – As senior developers, Level3 consultants are accountable for delivering major project outputs and ensuring technical documentation.
• Their work products include:
  • Core software components for the Digital Euro testing environment – notably, the Digital Euro Simulator backend, the EAT testing tools, and the DESP Member Portal as described in the call‑off (to be developed and delivered per the schedule). These are the primary deliverables of the project, which Level3 developers help drive to completion.
  • Software code and builds – Well‑structured, secure, and tested code for each release or sprint. They are expected to package and deliver software increments (source code, binaries, configuration scripts) for each sprint/release, including hot‑fixes and patches.
  • Testing and quality assurance artifacts – Automated test scripts and test results for each build (using tools like JUnit, Selenium, etc.), along with evidence of code quality and security scans (e.g., using Fortify or SonarQube) for every build.
  • Technical documentation and release notes – Up‑to‑date documentation such as release notes (detailing changes, version numbers, issue IDs addressed) and updated technical/design documents for the delivered software components. Level3 developers ensure that all documentation meets CLIENT standards and that knowledge is transferred for future maintenance.