Senior Network Engineer (all genders)

DEINE MISSION We're building the next-generation backend that powers Germany's largest reusable-packaging network - a circular-economy deposit-return system live across 17,000+ locations. It's a two-track hybrid modernisation (brown and greenfield), cloud-native, event-driven TypeScript platform that runs real-world operational logistics: partners, point-of-sale, returns, billing, and fulfillment at national scale, expanding internationally.  You'll join as a (senior) engineer (all genders) with real ownership: designing, building and own core services and working directly with our technical lead and peers on architecture. This is not a ticket-taking role - you'll shape the system, not just implement against it.    What you'll do:  * Design, build and own core platform services: partner management, point-of-sale, billing and invoicing, returns, fulfillment, and contract management * Build event-driven, async-heavy integrations between services and external systems -outbox patterns, queues, retries, dead-letter handling * Help drive our international expansion * Partner with the technical lead on architectural decisions, data modelling, and the incremental extraction of capabilities from our existing platform into the new one * Set the engineering bar-testing, observability, and operational readiness baked in from day one   Our stack: * Language: PHP (7.1) (current),TypeScript (Nextdirection) * Framework: Shopware 5.3 and NestJS * Data: Mariadb, PostgreSQL + Prisma * Cloud: Google CloudPlatform - Cloud Run, Pub/Sub, Cloud Tasks * AI: Claude (Code, Chat and Cowork) * APIs: REST * Platform: GCP * Existing platform (you'll learn its domain): PHP / Shopware the current production system we're incrementally extracting from. WAS DU MITBRINGST * 7–10 years of backend engineering, with deep production experience in Node.js, TypeScript and substantial hands-on NestJS in production plus ability to work with legacy PP2 (PHP) code * Strong system design and execution - you've designed distributed, async/queue-heavy systems and shipped them, not just white-boarded them * Solid relational data modelling and SQL (MySQL, PostgreSQL ideally) * Comfortable owning a problem end-to-end: design, build, test, ship, operate * As English is our work language, English language proficiency at minimum C1 level is necessary * EU work permission * Munich-based. This is a hybrid role: 2 days/week in our Munich office, rest remote Working with AI coding agents (a real part of this role)  We use AI coding agents (Claude Code) every day as a core part of how we build. We expect you to as well. Concretely, we're looking for someone who:  * has shipped production code with an AI coding agent, * can describe their workflow - how they spec, prompt, review, and integrate agent output, * has informed opinions on where agents fail and how they guard against it (review discipline, tests, architectural guardrails) This isn't a buzzword for us - it's how the team works, and our hiring process reflects it (below).    Nice to have  * Event-driven/ CQRS /outboxexperience * Google CloudPlatform * Migrationorlegacy-extractionexperience(incrementallyreplacinganoldersystem) * Comfortablereadingunfamiliarorlegacycodebases How we hire  * First Interview with People & Organisation (~25 minutes) - We want to get to know you better in a first meeting and you will get to know RECUP's culture, values and vision and understand yourself better for a mutual fit * Meet Hiring Manager (Tech Leader) (~25 minutes) - Understand the RECUP platform from a technical perspective * Our take-home case (~55 minutes) is AI-agent-assisted by design - use your preferred agent, as you would on the job. We don't test memorized syntax; we assess engineering judgment: how you specify work, catch and correct the agent, and make architectural decisions. Expect a brief take-home plus a live pairing and design session * Meet the Team (Tech Lead and Engineer) + live AI coding session (extension of our take-home test) (~55 minutes) - Experience working with your new team. * Meet our Co-CEO (~25 minutes) - Gain insight into our product and business WAS WIR BIETEN * The opportunity to make an impact at a company that combines economic growth with real, sustainable impact * Flexible working models (flexible hours, remote work) * Room for development and ownership: you actively shape your area * A personal, professional culture and open feedback culture * A dynamic, growth-oriented environment in a scale-up phase * Partnerships with Wellpass, Urban Sports Club, Open Up and Future Bens You can find all our benefits on our jobs page.  Want to help us write reusable packaging history?  Then we look forward to your application: send us a short, punchy cover letter and your CV via the application form. What matters to us are your skills, your experience and above all whether you identify with our values and company culture. Since we too are not entirely free from unconscious biases, we kindly ask you not to include a photo. Where can we still improve?  We want to become more diverse because we believe that we can only achieve our vision through diversity, and that innovation can only emerge through diversity. We therefore welcome applications from people with international backgrounds, people of all gender identities, all age groups, people of color, and people with disabilities or chronic illness.

This position sits close to the embedded world, but it isn't traditional microcontroller firmware work. You'll own the operating system foundation and platform layer of our IoT devices - building and evolving our next-generation embedded Linux image - and develop the Python application layer that runs on top of it, inside our dockerized main application. You'll work down at the OS and hardware boundary while shipping features up in the application layer. Typical areas include: * Designing and maintaining our Yocto-based Linux distribution for ARM devices with limited compute * Security on device, inter-process communication, networking, scheduling, observation * Over-the-air (OTA) updates for both the OS and applications * Integrating peripherals - watchdog, modem, AI accelerator - and improving their observability * Bridging the system layer and the application layer through Python and Bash The work spans from driver- and kernel-level integration in C/C++, to adapting our Linux distribution with Yocto to the underlying hardware layer, to debugging system-level failures such as memory leaks, up to writing the Python software that turns hardware capabilities into product features. You will be expected to pass a live coding interview for this role. WHAT TO EXPECT * Embedded Linux Platform: Design, build, and continuously evolve the next generation of our Yocto-based Linux distribution for ARM-powered IoT devices * Application Development: Develop Python-based software that brings hardware capabilities to life and improves the reliability and performance of our products * System Integration: Work across the full stack—from kernel and driver integration to application development—connecting hardware, operating system, and product features * Device Reliability: Build secure, observable, and resilient systems, including OTA updates, networking, process communication, scheduling, and device monitoring * Debugging & Troubleshooting: Analyze and resolve complex issues across the platform, including kernel, drivers, networking, memory management, and application software * Ownership: Take end-to-end responsibility for your solutions, proactively improve our platform, and help shape engineering best practices INSPIRE US BY * Embedded Linux Expertise: Several years of experience developing Embedded Linux systems and confidence working with Linux internals, GNU tools, and Bash * Engineering Mindset: Degree in Computer Science, Electrical Engineering, Physics, or equivalent practical experience * Yocto Experience: Proven experience building, customizing, and maintaining Linux images using Yocto * Systems Programming: Strong programming skills in at least one systems language such as C, C++, Rust, Go, or Java * Python Development: Experience developing Python applications or a strong motivation to make Python your primary development language * Low-Level Debugging: Hands-on experience with debugging tools such as GDB, tcpdump, Valgrind, UART, and JTAG, including troubleshooting memory leaks and system-level issues * Operating System Knowledge: Solid understanding of Linux internals, bootloaders, systemd, drivers, kernel concepts, networking, and Docker * Language Skills: Fluent English (C1) EXTRA POINTS FOR * Experience operating large-scale IoT fleets * Knowledge of industrial hardware, cameras, AI accelerators, modems, or network devices * Experience with computer vision, edge AI, or machine learning * Familiarity with MQTT and Protocol Buffers (ProtoBuf) WHAT WE OFFER * Flexibility & Responsibility: Your workday, your performance – Our hybrid model empowers you to focus from home, get fresh perspectives during workation, and connect in person during our Anchor Days (Tuesday to Thursday) * Tailored Mobility: Full speed ahead – Whether it’s sustainable bike leasing or a public transport subsidy, we keep you flexible and on the move * Measurable goals: Our agile methods allow you to directly measure your impact on our product and company success * Team Culture & Networking: Real connections – also beyond the day-to-day. Celebrate successes with us at legendary team events and OKR parties * Productive Environment: Brainfood deluxe – Whether it's portafilter coffee, Bella&Bona online cafeteria, fresh fruit or our muesli bar – your wellbeing fuels your performance * Health & Balance: Stay in balance with EGYM Wellpass or Urban Sports Club – access 1,000+ gyms and wellness spots across Germany * Top Equipment & Ergonomics: Mac or Windows, in the office or remote – we make sure you’re set up for efficiency and comfort * Dress Code? Your Code: What you do matters more than what you wear – dress in whatever makes you feel your best INNOVATION THROUGH DIVERSITY Regardless of your background, origin, gender identity, or individual circumstances, it's your personality that interests us. That's why we're committed to building a culture of collaboration and respect, where every team member has a voice, can grow, and feels valued with us. STILL HERE? Then we might be the perfect match! Ready to own (y)our growth? 🚀