Java Tech Lead (m/w/d) Mobility Startup

About Us

We develop and operate an end-to-end platform for car sharing and vehicle rental, currently used by customers in Germany, Austria, and Spain.

The platform is fully white-label capable and includes mobile apps, web applications, back-office tools, and integrations with telematics hardware, payment service providers, and KYC providers — all from a single, modular codebase.

The backend is based on Java 17 / Jakarta EE 10 Payara, while the frontend is built with React / React Native.

We are currently in a strategic growth phase and are now looking for an experienced technical leader to help shape the next stage of our development.

The Role

As Tech Lead, you will take on a central bridging role between Engineering and company leadership. You will work closely with the CTO, support them operationally, and ensure that the platform keeps pace with the company’s growth — both technically and organisationally.

This position is designed for someone who can dive deep into the code while also keeping the bigger picture in mind. You are not afraid of a mature system with history — you see it as an opportunity.

Technical Leadership & Architecture

• Further development and maintenance of the modular Java / Jakarta EE platform, including shared responsibility for architectural decisions

• Implementation of the identified infrastructure improvements: IaC Terraform / CloudFormation, multi-region setup, and disaster recovery plan

• Responsibility for implementing outstanding security measures

• Driving the migration of binary data from MongoDB to S3, as well as further technical debt reduction projects

• Evaluation and further development of the CI/CD pipelines GitLab CI and test coverage

Processes & Team Organization

• Establishment of formal code review processes and consistent planning cycles within the development team

• Close collaboration with the CTO on the gradual handover of engineering and operational responsibilities

• Support in building a product management process aligned with customer requirements

• Mentoring of the junior frontend developer and support for the senior engineers

Operations & Quality

• Shared responsibility for monitoring, alerting, and incident response AWS CloudWatch, Sentry, Crashlytics

• Automation of dependency vulnerability scanning within the CI pipeline

• Technical support for customer projects — from onboarding through to troubleshooting

Must-Have

• Several years of experience in backend development with Java — Jakarta EE / Java EE / Spring — in production systems

• Strong experience with Test-Driven Development (TDD), as well as a strong quality mindset and interest in software craftsmanship

• Proven experience as a Tech Lead or Senior Engineer with team responsibility

• Solid understanding of cloud infrastructure, ideally AWS — EC2, ECS, CloudWatch, S3

• Experience with MongoDB or comparable NoSQL databases in production environments

• Familiarity with CI/CD pipelines — GitLab CI, GitHub Actions, or similar — and modern deployment practices

• Hands-on mentality: you can deliver value immediately without requiring months of onboarding

Nice-to-Have

• Knowledge of Infrastructure as Code — Terraform or CloudFormation

• Experience with React and/or React Native on the frontend

• Understanding of the mobility, car-sharing, or vehicle rental domains

• Experience in regulated environments or with GDPR compliance projects

• Knowledge of telematics hardware integrations or IoT-related systems

• Class B driving licence

What We Offer

• One of the most technically impressive small platforms in the German mobility landscape — with real responsibility from day one

• Short decision-making paths and a high degree of freedom to shape things

• A well-established team with 5–10 years of shared platform history

• A modern tech stack: Java 17, Jakarta EE 10, React, React Native, GitLab CI/CD — without legacy burden

• 99.9% uptime — efficiency here is not an ambition, but a reality

• Hybrid working with an office in Berlin and flexible working hours

• Competitive salary, depending on experience and qualifications

• Active involvement in the strategic development of the company

How to Apply

We look forward to receiving your application — preferably including a short cover note, your CV, and, where relevant, references or GitHub projects.

A formal cover letter is not required; we value genuine interest and technical depth more than formalities.