Senior Software Engineer, Backend/Full-Stack

For over 35 years, F-Secure has led the cybersecurity industry with our 200+ service provider partners. As the home of scam protection, we're reimagining how we protect people from modern threats through cutting-edge scam detection and solutions that are setting the industry standard. We bring together the sharpest minds of cyber security with a shared purpose: to protect people from modern threats. Here, you’ll have a real impact, making every digital moment more secure for everyone. You’ll thrive and grow in our Fellowship culture, where we dream big, trust, and challenge each other to deliver results and move with speed. You’ll be welcomed into a diverse, global team with an informal and collaborative culture where your voice truly matters. Join us in securing the digital world together – where your work will make a lasting impact. Do you want to build something genuinely new, meaningful technology that protects people from scams while redefining what “secure” feels like? We're hiring a Senior Software Engineer (Backend/Full-Stack) to join our forward-leaning innovation team within F-Secure's product organization. Our mission is to safeguard consumers against scams while delivering an exceptional user experience that sets the industry standard for protection and usability. We're big believers in solving problems together, having designers, devs, and product folks all working in the same room, no red tape, no extra approval layers. We own our product and make decisions as a team every day to solve real customer problems, end to end. That's why our innovation team is working on-site at our Helsinki HQ typically 3-5 days a week, and hope that you would be ready for that too. Hours are flexible, dress code is non-existent, and yes, the fully equipped gym and rooftop sauna are as good as they sounds. Check it out here! About the team F-Secure's New Products and Innovations team is leveraging F-Secure's proven security technologies while pioneering new consumer experiences, tools, and product concepts. The team is small by design: a cross-functional unit of engineers, designers, and product thinkers with autonomy to explore, prototype, and deliver at startup speed. Everyone is hands-on, there are no management layers, no one on the sidelines. We all ship, contribute directly to the product, and own outcomes together. We cut through bureaucracy, make decisions fast, and focus relentlessly on what matters most: building consumer experiences that feel intuitive, human, and trustworthy. Scams have become an industrial-scale problem run by sophisticated criminals, and for ordinary people, even experts, it's getting harder to tell what's real. We're building something that restores confidence, trust and peace of mind, replacing fear, confusion, and shame with clarity, protection, and support. Every feature we ship can help someone avoid losing their savings or recover from an attack. That real-world human impact is what drives us. We aim for MLP — Minimum Lovable Product — not just viable. Every prototype must earn its place in consumers’ hands by solving a real problem beautifully.Our estimated salary range for this role is 5,500 - 6,500 EUR/month, based on your experience and skills. What you'll do:As a Senior Software Engineer, you'll be part of a small team owning everything from prototype to production. You'll design, build, and evolve the backend systems and APIs that power our product, from Node.js services and AWS infrastructure to integrations with AI models, third-party services, and optimizing performance and scalability. Your work will touch millions of consumers and directly shape the evolution of our product concept: a seamless "safety net" that helps people prevent, protect, and recover from scams with confidence. Your day-to-day may include: Building Node.js backend services and APIs from concept to productionDesigning and deploying AWS cloud infrastructure (Lambda, API Gateway, DynamoDB, etc.)Driving a rapid internal alpha → beta (10k+ users) → production delivery rhythmIntegrating new technologies (AI, third-party APIs, etc.) into real user experiencesCollaborating closely with frontend engineers to prototype, test, and iterateShipping features to real users every week — and learning fast from their feedback What are we looking for? We’re not looking for someone to maintain existing systems — we’re looking for a builder. Someone who thrives on turning uncertainty into clarity, prototypes into production, and ideas into impact. You’ll do well here if you have: 5+ years of experience building production-grade backend systemsStrong hands-on experience with Node.js and AWS cloud servicesDeep understanding of cloud architecture, scalability, and performance optimizationExperience with React or frontend development for full-stack collaborationComfort working in a fast-paced, experimental environment with tight feedback loopsStrong sense of ownership — you build, you test, you ship, you learnCuriosity, pragmatism, and a bias toward action Bonus points for: Experience with consumer-facing products or mobile app backendsExperience with serverless architectures and infrastructure-as-codeReact Native or mobile development experience for deeper cross-platform collaborationFamiliarity with AI/ML integrations and real-time data processing Why this role matters This is a rare opportunity: the resources and reach of F-Secure, combined with the autonomy and pace of a startup. You’ll join early enough to influence how we work, what we build, and the culture we create. Within your first 6–12 months, you'll ship features used by millions of people and shape the direction of a product designed to protect them from real harm. This might not be the right fit for you if you... Prefer detailed instructions before getting things startedPrefer working on a small slice of the codebase without knowing if it ever reaches a customerPrefer routines and find changes more draining than energising But you'll love