Interzero
Senior Full-Stack Engineer (m/f/d) - Java or PHP + React/Next.js/TypeScript
Interzero, Germantown, Ohio, United States
Senior Full-Stack Engineer (m/f/d) - Java or PHP + React/Next.js/TypeScript
Interzero Business Solutions GmbH is one of the leading environmental service providers based in Cologne. As a full-service provider of recycling services, it offers industry and commerce solutions for the collection of sales and transport packaging, product recycling, deposit return, innovative reusable transport packaging, as well as consulting and disposal services for sites, warehouses, and branches. We’re building our product department inside one of Germany’s leading sustainability companies. Our mission: deliver digital services that push Earth Overshoot Day further into the future by enabling a true circular economy. Some products start on a blank canvas; others modernise and extend what already works. If you want to shape what we build - and how we build it - rather than just work a ticket queue, let’s talk. Build Digital Products that #MoveTheDate What You Will Do Turn ideas into running code: Work in cross-functional squads with Product, UX and Data colleagues to design, build and evolve applications end-to-end. Back end: choose your strength (Java/Spring Boot or PHP/Laravel) and create reliable domain logic and APIs. Front end: craft engaging UIs in React/Next.js with TypeScript, component libraries and modern CSS. Build the glue in-between: Design clear contracts between front end and back end (REST or GraphQL), handle auth flows and optimise performance all the way to first paint. Shape a modern platform: We’re moving toward a headless, microservice-oriented landscape. As a senior, you’ll help create clean APIs, refine coding standards and champion the right refactorings. Automate where it matters: Build and refine GitLab pipelines, Docker images and workflow engines that remove manual steps - both in development and inside the products themselves. Grow - if you want to: Mentor junior engineers, run architecture sessions or even lead a small squad when it fits your personal goals. Stay curious: Experiment with new language features, edge-side rendering, server components, cloud services - any idea that helps us close product loops faster. What You Bring 5 + years of professional software experience, including: Solid back-end chops in either Java/Spring Boot or PHP/Laravel. Modern front-end skills with React, Next.js and TypeScript. Clear understanding of RESTful API design, relational databases (MySQL/PostgreSQL) and containerisation with Docker. Familiarity with GitLab CI/CD - our DevOps team handles the heavy lifting, but you’re comfortable tweaking pipelines. A feel for clean architectures, test automation and the judgement to choose the right pattern at the right time. Fluent English (German is a bonus), a collaborative mindset and genuine curiosity about how products succeed in the real world. A valid EU work permit; candidates already based in Germany (or nearby EU countries) are strongly preferred. Why you’ll like working with us Variety: shape greenfield services from scratch and breathe new life into proven applications - both matter equally. Work where you thrive: 100 % remote within the EU (ideally Germany) or on-site in our modern offices - your call. Competitive salary plus extensive benefits: company pension scheme, Germany ticket, bike leasing, family & life counselling, comprehensive health programmes and more. Opportunity to shape: Plenty of freedom to influence how our new product organisation takes shape. Purpose with measurable impact: every feature you ship advances the circular economy and our #MoveTheDate mission.
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Interzero Business Solutions GmbH is one of the leading environmental service providers based in Cologne. As a full-service provider of recycling services, it offers industry and commerce solutions for the collection of sales and transport packaging, product recycling, deposit return, innovative reusable transport packaging, as well as consulting and disposal services for sites, warehouses, and branches. We’re building our product department inside one of Germany’s leading sustainability companies. Our mission: deliver digital services that push Earth Overshoot Day further into the future by enabling a true circular economy. Some products start on a blank canvas; others modernise and extend what already works. If you want to shape what we build - and how we build it - rather than just work a ticket queue, let’s talk. Build Digital Products that #MoveTheDate What You Will Do Turn ideas into running code: Work in cross-functional squads with Product, UX and Data colleagues to design, build and evolve applications end-to-end. Back end: choose your strength (Java/Spring Boot or PHP/Laravel) and create reliable domain logic and APIs. Front end: craft engaging UIs in React/Next.js with TypeScript, component libraries and modern CSS. Build the glue in-between: Design clear contracts between front end and back end (REST or GraphQL), handle auth flows and optimise performance all the way to first paint. Shape a modern platform: We’re moving toward a headless, microservice-oriented landscape. As a senior, you’ll help create clean APIs, refine coding standards and champion the right refactorings. Automate where it matters: Build and refine GitLab pipelines, Docker images and workflow engines that remove manual steps - both in development and inside the products themselves. Grow - if you want to: Mentor junior engineers, run architecture sessions or even lead a small squad when it fits your personal goals. Stay curious: Experiment with new language features, edge-side rendering, server components, cloud services - any idea that helps us close product loops faster. What You Bring 5 + years of professional software experience, including: Solid back-end chops in either Java/Spring Boot or PHP/Laravel. Modern front-end skills with React, Next.js and TypeScript. Clear understanding of RESTful API design, relational databases (MySQL/PostgreSQL) and containerisation with Docker. Familiarity with GitLab CI/CD - our DevOps team handles the heavy lifting, but you’re comfortable tweaking pipelines. A feel for clean architectures, test automation and the judgement to choose the right pattern at the right time. Fluent English (German is a bonus), a collaborative mindset and genuine curiosity about how products succeed in the real world. A valid EU work permit; candidates already based in Germany (or nearby EU countries) are strongly preferred. Why you’ll like working with us Variety: shape greenfield services from scratch and breathe new life into proven applications - both matter equally. Work where you thrive: 100 % remote within the EU (ideally Germany) or on-site in our modern offices - your call. Competitive salary plus extensive benefits: company pension scheme, Germany ticket, bike leasing, family & life counselling, comprehensive health programmes and more. Opportunity to shape: Plenty of freedom to influence how our new product organisation takes shape. Purpose with measurable impact: every feature you ship advances the circular economy and our #MoveTheDate mission.
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