Fullstack Engineer (m/f/d)

Eye Security

ABOUT EYE SECURITY Eye Security is an international scale-up providing cyber security with embedded cyber insurance to SMBs in Europe. Our cyber security innovations, state-of-the-art automation and platforms are being built and maintained by our Product and Engineering Teams. Our engineers and product managers collaborate closely with cyber security experts to ensure that their hacker's mindset is embedded into our platform. Our platform is a proprietary Open XDR (eXtended Detection Response) system that brings in security data from several market leading cyber security products into our centralised repository. From here cyber security experts can work their magic. This makes sure that our hundreds of customers experience the same value via automated systems, allowing us to scale in Europe. ABOUT THIS ROLE We're looking for a Senior Engineer to join one of our stream-aligned engineering teams. At Eye, we organise engineering around streams: mission-driven groups with a clear outcome to drive, not a product area or a section of the codebase. You'll work in a small, full-stack team of 2-3 engineers contributing to your stream's goal, working across whatever systems and layers are needed to deliver it. This is a role for someone who wants real ownership, not a queue of tickets. IN THIS ROLE * Own features end-to-end as Feature Lead: scope the problem, coordinate work within your team, make day-to-day technical decisions, and ship it to production. * Deliver high quality features both individually and with other team members, working full-stack across whatever the stream requires. * Collaborate with internal stakeholders to design and develop features that deliver real-world value. * Contribute to technical decision-making within your stream, including surfacing tradeoffs and risks early. * Participate in creating a psychologically safe and happy environment within the team and the company. * The role is remote in the Netherlands or in Berlin, but you commit to travelling to the office (The Hague or Berlin) twice per week. WHAT YOU WILL NEED * 5+ years of development experience, including meaningful full-stack exposure. You are comfortable working across backend and frontend layers and you pick up new technologies independently. * Experience with strongly typed languages (i.e., Typescript, Java, dotnet, PHP). We operate in Go and React, and we back ourselves to get a seasoned engineer with strongly typed experience up to speed in our tech stack quickly. * Comfortable using AI coding tools as part of your daily development workflow, and curious about how AI can improve how we build. * Excellent communication and collaboration skills, with the ability to influence technical and non-technical stakeholders. * Knowledge of secure coding practices and understanding of secure development principles to building safe, trusted systems * Fluency in English is a must. WHAT WE OFFER * Work on genuinely hard problems in a complex domain: XDR, security data at scale, and tooling that empowers security analysts to protect hundreds of customers across Europe. * Real ownership in a small, autonomous team where every engineer is close to the work, close to the decision-making, and close to the impact. * A deliberate bet on AI-augmented engineering: we are building toward small teams that punch well above their weight through smart AI adoption, and you will be part of shaping how that works in practice. * Be at the forefront of innovation, shaping the future of our technology infrastructure. * Enjoy a competitive compensation package and comprehensive benefits. * Join a young and thriving scale-up which is on its way to becoming the category leader in Europe. * We are a great place to work, filled with people who enjoy working together. We are a rapidly growing company and believe in investing in our people. If you're a highly motivated and results-oriented engineer with a passion for building secure, scalable technologies, we encourage you to apply!

Kayzen

Remote from India Hello 👋 I am Servesh, Co- founder and CTO at Kayzen, and I am now looking for a Fullstack Engineer to join our Console team. 🙌 But wait, you have not heard of Kayzen before? 😃 Kayzen is a mobile demand-side platform (DSP) dedicated to democratizing programmatic advertising. We enable leading apps, agencies, media buyers, and brands to run programmatic customer acquisition, retargeting, and brand performance campaigns through its self-serve and managed service options. Built on the three core pillars of performance, transparency, and control, Kayzen powers the world’s best mobile marketing teams with bespoke solutions that fuel business growth and deliver a competitive advantage. With an unprecedented scale of 160B+ daily ad requests from 1.6B+ unique users worldwide, we serve up to 1B+ ads per day in 180 countries. Kayzen is accessible through our APIs and user interface. The Team The Console team owns the user-facing applications and interfaces that power the Kayzen platform — from our self-serve campaign management dashboard and real-time reporting suite to internal tooling used by our managed service teams. We work closely with product managers, designers, backend engineers, and data teams to deliver seamless, high-performance experiences. We are responsible for some of the most impactful work at Kayzen, including: * “The Console” which is the face of Kayzen we are very proud of. * Complex features which surface a lot of backend infrastructure via console * Almost 100% uptime with very well planned & executed project management  Sounds interesting. Isn’t it? About the Role We are looking for a coding-first Fullstack Engineer who thrives on turning complex product requirements into high-performance UIs. You should be comfortable working across the stack, contributing to architecture discussions, and be an early adopter of AI-assisted engineering (e.g., Claude Code, Cursor, Copilot) in your daily coding workflow. This role is a strong individual contributor position with room to grow into deeper technical ownership over time. Responsibilities * Core responsibilities * Design, build, and maintain high-quality features across the Fullstack stack, from UI to API integration * Write clean, well-tested, production-ready code and actively participate in code reviews * Collaborate closely with Product, Design, QA, and Backend teams to deliver cohesive, user-centric features * Contribute to technical decisions around architecture, tooling, and best practices within the team * Take ownership of features end to end, from planning through deployment and monitoring * Hands-on AI Implementation * Integrate AI-powered coding agents and automated LLM-based testing into your daily development cycle * Contribute to building 'AI-First' UI patterns, working alongside the LLM Platform team on generative, prompt-driven interfaces * Stay current with emerging AI-assisted development tools and bring relevant ones back to the team * Project & Execution Management * Break down assigned product requirements into clear, actionable engineering tasks * Deliver work reliably within sprint commitments, flagging blockers or scope changes early * Balance new feature delivery with addressing technical debt in the codebase you work on Requirements FULLSTACK TECHNICAL EXCELLENCE (CORE FOCUS) * Minimum 5+ years of professional Fullstack development experience with modern JavaScript/TypeScript * Solid expertise in at least one major framework (React, Angular, or Vue) and its ecosystem * Strong understanding of HTML5, CSS3, responsive design, and cross-browser compatibility * Experience building data-heavy UIs, ideally including real-time data visualization * Good grasp of Fullstack performance optimization, including bundle size, rendering, lazy loading, and caching strategies * Experience with state management patterns (Redux, MobX, Zustand, or similar) * Working knowledge of Fullstack testing methodologies, unit, integration, and end-to-end (Jest, Cypress, Playwright, or similar) * Comfortable working with design systems and shared component libraries * Experience using AI-assisted development tools (e.g., Claude Code) to boost engineering productivity ENGINEERING MATURITY * Experience contributing to Fullstack architecture decisions on production applications * Solid understanding of APIs, RESTful services, GraphQL, and system design fundamentals * Ability to give and receive constructive feedback through code reviews * Great communication skills, able to explain technical decisions clearly to teammates and stakeholders STARTUP MINDSET * Bias for shipping and iteration, you deliver incrementally and learn from real users * Comfortable with ambiguity and rapid change in a fast-paced environment * Thinking in terms of leverage and reuse, not one-off solutions * Pragmatic about trade-offs between perfectionism and speed of delivery LESS ABOUT * Developers who prefer working in isolation on narrowly scoped tickets without engaging with the wider product context. We need someone who wants to understand the "why" behind the work and contribute ideas, not just execute tasks. NICE TO HAVE * Experience with Ruby on Rails * Familiarity with ad-tech, real-time bidding platforms, or high-traffic data products * Contributions to open-source Fullstack projects or community involvement * Experience building Fullstack interfaces for AI/ML-powered products (e.g., chatbots, recommendation engines, AI-generated content displays) * Familiarity with LLM APIs and prompt-driven UI patterns What do we offer? * Exceptional career growth and learning opportunity * A unique opportunity to be part of an experienced team of industry experts and entrepreneurs who bring massive change to the Adtech market * A fun, driven, and multinational team located across Germany, India, UK, Argentina, Ukraine, Turkey, Spain and many more countries * A flexible work-from-home arrangement * A 500-dollar home-office setup budget * A 1000-dollar annual learning and development budget

voize

🎤 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!