Senior Backend Software Engineer (all genders) PHP/Symfony

About this role

*Please note that we can only accept applications from within Germany.*

JUMiNGO builds software for international shipping. Customers use our platform to manage international express shipments with carriers like DHL, UPS, FedEx, GLS and DPD. Logistics is complex - our goal is to make it manageable through well-structured, reliable software.

Our backend is the backbone of our product. It handles integrations, business logic and the stability our customers rely on every day. As our platform grows, so do the demands on performance, scalability and clean system design.

To further strengthen this foundation, we’re looking for a
Backend Engineer (all genders)
— full-time in Cologne or remotely within Germany. Sounds like your playground? Join us and apply now!

Your Mission

- Take ownership of services and drive them from idea to production
, from shaping requirements and technical design to implementation, rollout, and iteration
- Design, build, and evolve backend services using
PHP, Symfony, and API Platform
powering our logistics platform used in real production scenarios
- Work in a
remote-first engineering setup
with high autonomy, where decisions are made close to the code and ownership sits with the team
- Model complex logistics workflows (rates, shipments, carrier integrations, tracking, billing) in a way that stays understandable and maintainable as the system grows
- Build and evolve well-structured
REST APIs
with strong focus on consistency, performance, and developer experience
- Integrate with multiple external carrier APIs (DHL, UPS, FedEx, etc.), handling reliability concerns like retries, idempotency, and failure recovery
- Improve reliability and performance through profiling, query optimization, caching strategies, and pragmatic architectural decisions
- Write automated tests that provide real value and support confident deployments
- Collaborate asynchronously with frontend, product, and QA to deliver features ...