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Senior Backend Software Engineer

Wearehaystack — Germany · Posted ~2 hours ago

Senior Full-time

Skills

Node.js TypeScript NestJS Backend engineering Event-driven architecture Asynchronous systems System architecture Data modeling Testing Observability Operational readiness Legacy PHP PHP Microservices

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Summary ✨ AI‑Generated

Take ownership of core backend services in a rapidly expanding circular-economy technology environment. You will build event-driven and asynchronous integrations, contribute to architecture and data modeling, modernize existing systems, and establish strong standards for testing, observability, and operational readiness. Deep production experience with Node.js, TypeScript, and NestJS is essential.

Highlights

Own core backend services supporting partner management, transactions, billing, returns, fulfillment, and contracts. The role offers substantial architectural influence, international expansion work, event-driven systems, platform modernization, and high engineering standards for testing and observability.

Description

We're working with a highly innovative company building the next-generation backend for Germany's largest reusable-packaging network, a circular-economy deposit-return system expanding internationally. They are dedicated to creating a sustainable and circular ecosystem for a world without single-use packaging. The Role Design, build, and own core platform services for partner management, point-of-sale, billing, returns, fulfillment, and contract management Build event-driven, async-heavy integrations between services and external systems Help drive international expansion efforts Partner with the technical lead on architectural decisions, data modelling, and incremental platform modernization Set high engineering standards for testing, observability, and operational readiness from the outset What You'll Need 7-10 years of backend engineering experience, with deep production expertise in Node.js, TypeScript, and NestJS Ability to work with legacy PHP (PP2) codebases Strong system design and execution skills for distributed, async/queue-heavy systems Solid relational data modelling and SQL experience (MySQL, PostgreSQL preferred) Comfort owning problems end-to-end: design, build, test, ship, and operate Experience shipping production code with AI coding agents and an informed workflow for their use What's On Offer The opportunity to make a significant impact on sustainability and economic growth Flexible working models, including remote work options Real ownership and influence in shaping your area within a dynamic, growing environment A professional culture with open feedback and strong partnerships for employee well-being Apply via Haystack today!