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Senior Fullstack Engineer (m/f/d)

voize

Berlin, GermanyHybridFull-timeNo compensation foundPosted 2mo agoVerified open 5 days ago
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At a glance

Compensation
No compensation found
Location
Berlin, GermanyHybrid
Schedule
Full-time
Work Authorization
Not specified

Job overview

voize is hiring a Senior Fullstack Engineer (m/f/d). As a Senior Fullstack Engineer at voize, you will co-own the ML App, an in-house platform for annotation, data exploration, ML training orchestration, and model evaluation. This role involves designing and shipping features for data labeling, ML training, and model playgrounds, while ensuring HIPAA-compliant training on US customer data. You will also maintain CI/CD, EKS deploys, and observability for the ML App, and mentor junior engineers.

Key focus areas include 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, and Drive the next iteration of in-house annotation tooling — UX, throughput, task-type extensibility — to the bar where vendor revisits are unnecessary.

Successful candidates bring 5+ Years Building Production Fullstack Web Apps, German Proficiency B2, and Fluent English. Important skills include React, TypeScript, Kotlin, JVM, Schema Design, and HIPAA. Preferred (not required): Amazon EKS, CI/CD, LGTM-Stack Observability, and FGA Proxy.

Skills & qualifications

RequiredNice to have

Skills

ReactTypeScriptKotlinJVMSchema DesignHIPAAGDPRBAAPHIProduct InstinctsUX InstinctsGerman B2 LevelFluent EnglishAmazon EKSCI/CDLGTM-Stack ObservabilityFGA ProxyOpenID ConnectCoachingCode Review

Qualifications

5+ Years Production Fullstack Web Apps With React + TypeScript SPAsOwnership of Complex, Production-Critical System as Senior Peer

Benefits

Paid Time Off

Full job description

🎤 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!

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