Senior Software Engineer (Java)

• We are looking for a Senior Software Engineer to join our Carrier Integration Team
• You will design, build, and operate the backend services that integrate Seven Senders with Europe’s carriers end-to-end; from label generation, routing, and returns to ingesting and normalizing parcel tracking events from dozens of carrier APIs, EDI feeds, and webhooks
• You will own the full lifecycle, from architecture to production, on a modern, event-driven JVM stack built around Domain-Driven Design
• Design, develop, and operate backend microservices using Java and Spring Boot, following Domain-Driven Design and clean architecture principles
• Build event-driven pipelines using Kafka and SQS to ingest, normalise, and distribute high-volume carrier-tracking events
• Integrate new carriers across REST, SOAP, EDI, and SFTP, designing resilient clients for third-party APIs
• Design efficient, scalable data models in MongoDB and MySQL
• Deploy and operate containerised services on Kubernetes (AWS, Datadog, Prometheus), writing well-tested, contract-first code and actively contributing to design discussions, code reviews, and agile ceremonies

Benefits

• Flex your work: Our hybrid model lets you work remotely 60% of the time and enjoy our vibrant office 40% of the time. With our work abroad policy, you can work from nearly anywhere worldwide for up to two months each year
• Enjoy our vibrant workplace: You choose where you work best from our range of flexible working spaces. Take a break in our spacious lounge, get some fresh air on the balcony or at the terrace, or enjoy a game of table tennis, kicker, or PlayStation with colleagues
• Maximise your benefits: With our flexible benefits wallet, you will have a monthly allowance to purchase vouchers for top brands like Zalando and Spotify. You can also use your funds towards an Urban Sports Club membership, or BVG ticket. Also, you can get additional tax benefits for bike leasing via JobRad
• Find your balance: Need a moment of reflection or prayer? Our Relax Room offers a peaceful space. Plus, you can bring your children along—we have a dedicated Kids' Room to keep them entertained
• Build bonds beyond work: Our team knows how to connect and have a good time. From cooking events to watching football to company lunches and festive parties, our events allow us to share our different cultures and strengthen our bond as a team
• Boost your language skills: We offer German and English language courses to anyone looking to improve their communication skills and confidence. Your partner is also welcome to join our language courses
• Make work pawsome: We have a dog-friendly office and welcome your furry friends, creating a joyful environment for everyone. And yes, colleagues will be happy for a chance to pet and cuddle your adorable dog
• Bring your best talent onboard: Recommend friends, acquaintances, or former colleagues you think would be an excellent fit for us. As a token of our appreciation, our Referral Program offers rewards of up to 3000 euros for successful hires based on your recommendations
• Hardware your way: You can choose between a Mac or Windows laptop and an iPhone or Android smartphone. We also provide a mouse, keyboard, and additional monitor to improve your home office setup. (The hardware provision may vary based on your responsibilities and department)

Hands-on knowledge of both NoSQL (MongoDB) and relational (MySQL) databases, including data modelling and performance tuningSolid experience with microservices and event-driven architectures (Kafka, SQS, or equivalent), and contract-first API development with OpenAPIStrong grasp of Domain-Driven Design and software architecture, with proven experience integrating third-party APIs and designing for resilience against unreliable upstreamsProduction experience with Docker, Kubernetes, and cloud-native AWS environments; familiarity with GraalVM native images and Vue + TypeScript is a plus5+ years of backend development experience with strong proficiency in Java and the Spring Boot / Spring ecosystemIf you meet the above qualifications and are excited about the opportunity to join our team, we encourage you to submit your application today