Fullstack Engineer (m/f/d)

🎤 WHY VOIZE? BECAUSE WE’RE MORE THAN JUST A JOB! At voize, we believe the greatest gift to frontline workers is time - time to care, connect, and be present. Today, that time is lost to busywork and complex systems that pull them away from what matters most: people. Our vision is to change that by building AI companions that seamlessly take over digital workflows. We don’t replace humans with technology - we amplify their impact. Our mission is backed with a $50M Series A funding led by Balderton Capital, with support from HV Capital, Y Combinator and other leading VCs. Today, 2,000+ facilities trust voize, and over 200,000 users rely on our AI companion to ease their daily workload. As a dynamic team, we combine first-in-class technology with meaningful social impact. And now, we’re looking for you to join us on this mission! 💡 YOUR MISSION As a Senior Fullstack Engineer at voize, you will be a co-owner of voize's ML App — the in-house platform for annotation, data exploration, ML training orchestration, model evaluation, and the HIPAA-bearing data flows that move PHI from customer to model. Make in-house tooling good enough that revisiting Labelbox/Encord-style vendors is permanently off the table, and unblock HIPAA-compliant training on US customer data. 🚀 YOUR DAILY BUSINESS - NO TWO DAYS ARE ALIKE * Co-own the ML App codebase (React/TS SPA + Kotlin services + Kotlin ETL on EKS) * Design and ship features for data labelling, data exploration, ML training orchestration, model evaluation, model playgrounds, and ML-issue triage * Drive the next iteration of in-house annotation tooling — UX, throughput, task-type extensibility — to the bar where vendor revisits are unnecessary * Maintain CI/CD, EKS deploys, and LGTM-stack observability for ML App; triage and fix defects * Pair with the Platform team on platform-side prerequisites (FGA proxy, OIDC) that the new training flows depend on * Mentor and code-review across ML App; share conventions with adjacent teams (Mgmt App, Data, Platform) 🤝 YOUR SKILLSET - WHAT YOU BRING TO THE TABLE * 5+ years building production fullstack web apps with React + TypeScript SPAs * Strong Kotlin (or JVM) backend experience — services, ETL/data pipelines, schema design * Demonstrated ownership of a complex, production-critical system as a senior peer (not solo) * Comfortable engineering with regulated / sensitive data (HIPAA, GDPR, BAA, PHI, or similar) * Strong product / UX instincts (annotation, labeling, data exploration, ops UI) * German proficiency at B2 level or above, and fluent in English 🌱 GROWING TOGETHER - WHAT YOU CAN EXPECT AT VOIZE * We are a fast-growing startup, that means you will tackle challenges, grow quickly, and make a real impact, giving frontline workers more time for people * We foster an open, collaborative culture with regular team events, whether you work from our Berlin office or remotely across Germany * Become a co-creator of our success with stock options * Generous perks: 30 vacation days plus your birthday off, Germany Transport Ticket, Urban Sports Club, regular company off-sites, and access to learning platforms such as Blinkist and Audible, plus free language courses * You decide when you work best, that means flexible working hours and a good hybrid set-up. ✨ READY TO TALK? APPLY NOW! 🚀 We look forward to your application and can’t wait to meet you – no matter who you are or what background you have!

JOIN OUR TEAM As a Senior Software Engineer on our Web & API team, you will play a key role in shaping and evolving our e-commerce storefront. Working across the full stack, from React components and data integrations to AI-powered features, you will take ownership of complex features end-to-end, from specification and architecture through to delivery and monitoring. In close collaboration with Product and Design in an agile environment, you will combine a keen eye for performance with a drive to build experiences that delight millions of customers. Your curiosity for emerging technologies will help the team work smarter, ship faster, and continuously push the boundaries of what is possible. This position is permanent and based in Munich. WHAT YOU'LL DO * Design, build, and maintain features end-to-end across the storefront and mobile API, from specification through server-side data loading and UI to production release and maintenance * Build and extend integrations with our e-commerce, headless CMS, search, analytics, and experimentation platforms * Build AI-powered user-facing features, directing and reviewing AI coding agents in your own and the team's workflow while owning the correctness, security, and maintainability of everything that ships * Own the caching, rendering, and performance strategy for the storefront and mobile API * Partner with Product Managers and Designers to turn business goals into performant, high-quality user experiences * Champion code quality and reliability through testing, code reviews, and the conventions and context that keep the codebase healthy for both engineers and AI agents as it grows YOU COME WITH * Deep expertise in React, TypeScript, and modern frontend development, backed by strong software architecture skills and solid engineering principles * A sharp focus on performance across the stack, from frontend rendering to backend data fetching, including server-side rendering (ideally with React Router) and GraphQL * Strong specification and architecture judgment, turning ambiguous requests into precise, testable specs that teammates and coding agents build against, while making load-bearing technical decisions with confidence * Rigorous approach to code verification, designing the tests, evals, and checks that determine production readiness without relying on surface-level outputs * High standards for maintainability, resilience, security, and cost efficiency, reasoning through failure modes and remaining especially vigilant when reviewing AI-generated code * Proven fluency with Agentic AI, directing coding agents on well-scoped work, reviewing output with informed scepticism, owning the result, and leveraging AI to accelerate delivery and power user-facing features * A product-driven mindset that connects technical decisions to business impact and user experience, with prior experience in Product Engineering or Product Management considered a plus * Fluency in English with excellent written and verbal communication skills WHY WESTWING If you are looking for a place where ambition meets creativity, where ideas turn into impact fast, and where people are trusted to grow - you have found it. At Westwing, we’re building the Superbrand in Design with a team that’s shaping the future of beautiful home & living. Here is what you can look forward to: • A high-performance culture built on trust, feedback and collaboration • An inspiring, international environment that empowers you to think big, take ownership, and grow beyond your comfort zone • A flexible hybrid setup with ideally 3 office days per week - because strong connections and quick collaboration make great ideas happen • Professionally equipped workstation of your personal choice • 30 days of paid holiday to rest, recharge, and come back ready to create • A beautiful, centrally located, dog-friendly office with inspiring spaces, a sunny terrace, and good food - designed for moments that energise and connect • Exclusive discounts - 40% off Westwing Collection, 20% off third-party brands (each on non-reduced items), 10% Family & Friends discount, plus special-occasion vouchers • Wellbeing support through mental health resources, sports memberships, and preventive care • Sustainable mobility options with discounted public transport and JobRad - moving with purpose and care for the planet • Support for working parents, including our on-site Westwing Wichtel daycare and a partnership with multilingual provider Elly & Stoffl • One annual Social Impact Day to give back to a cause you care about - because being human is our true superpower • Team rituals that celebrate results and togetherness - from Summer & Winter Parties to Oktoberfest ABOUT US Westwing, Europe’s #1 in Beautiful Living e-commerce, is present in 20+ European countries and achieved a GMV (Gross Merchandise Volume) of EUR 507 million in 2025. As Europe’s premium one-stop destination for Design Lovers, it offers a unique brand experience with a carefully curated assortment of the Westwing Collection and 3rd party design brands. The integrated platform combines Shop, Daily Specials, Stores, the B2B Service (Westwing Business) and the Westwing Design Service. Westwing’s team works together on its shared purpose to “Excite people to create homes that unlock the full beauty of life”. Founded in 2011, Westwing is headquartered in Munich and went public on the Frankfurt Stock Exchange in October 2018. Our team is a diverse group of professionals aiming for high performance, working together at a fast pace in an inspiring, international and informal environment that enables you to grow your career while working with a brand and products our customers love. We’re made up of passionate people who are creative enough to disrupt the status quo, brave enough to fail and smart enough to win. So come, be part of the “wow, you work at Westwing?” crowd. Diversity is deeply rooted in our culture. Our mission doesn’t stop to inspire only your design choices, it continues to embrace an inclusive lifestyle filled with respect to everyone’s uniqueness, cultural differences and equal opportunity. DEPARTMENT Technology