Senior Software Engineer, Backend/Full-Stack

Job Description

F-Secure makes every digital moment more secure, for everyone. For over 35 years, we’ve led the cyber security industry, protecting tens of millions of people online together with our 200+ service provider partners. We value our Fellows' individuality, with an inclusive environment where diversity drives innovation and growth. What makes you unique is what we value – be yourself, that is (y)our greatest asset. Founded in Finland, F‑Secure has offices in Europe, North America and Asia Pacific.

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.

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 production
• Designing and deploying AWS cloud infrastructure (Lambda, API Gateway, DynamoDB, etc.)
• Driving a rapid internal alpha → beta (10k+ users) → production delivery rhythm
• Integrating new technologies (AI, third-party APIs, etc.) into real user experiences
• Collaborating closely with frontend engineers to prototype, test, and iterate
• Shipping 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 systems
• Strong hands-on experience with Node.js and AWS cloud services
• Deep understanding of cloud architecture, scalability, and performance optimization
• Experience with React or frontend development for full-stack collaboration
• Comfort working in a fast-paced, experimental environment with tight feedback loops
• Strong sense of ownership — you build, you test, you ship, you learn
• Curiosity, pragmatism, and a bias toward action

Bonus points for:

• Experience with consumer-facing products or mobile app backends
• Experience with serverless architectures and infrastructure-as-code
• React Native or mobile development experience for deeper cross-platform collaboration
• Familiarity 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 started
• Prefer working on a small slice of the codebase without knowing if it ever reaches a customer
• Prefer routines and find changes more draining than energising

But you'll love this role if you...

• Enjoy tackling complex problems and can back up your opinions with confidence and deep technical knowledge
• Want to work with cutting-edge tech to solve real customer problems
• Get a kick out of protecting people, shipping improvements and hearing back from actual users

What will you get from us?

• Welcome to the good side – the home of scam protection! Work with industry-leading experts defining the future of cybersecurity and scam protection
• Be an AI pioneer, not a follower. Access industry-leading tools like Claude and Claude Code, with full support to integrate AI into your daily work while others are still figuring out policies. We're not asking "if" but "how" AI transforms our work, positioning you at the forefront of the industry.
• Thrive in our Fellowship culture where we empower, trust, challenge, and support each other in doing our best work.
• Flexible work that works for you – hybrid and remote options with team-agreed ways of working.
• Inclusive environment with flat, approachable leadership in our diverse global community.
• Comprehensive global benefits including Employee Share Savings Plan (ESSP), Fellow Member of the Board opportunities, and Annual Protect & Educate paid volunteer day.
• Wellbeing support through personal coaching services and one hour per week for personal recharging.
• Continuous growth via F-Secure Academy, Leadership programs, AI training, mentoring, and dedicated Learning Week.

Our benefits include extensive health care, recharging hours to support your wellbeing, flexible remote working, company supported sport activities, lunch vouchers, regular massages, gym and sauna at the premises and many more things to keep our best asset – people - happy!

A security vetting will possibly be conducted for the selected candidate in accordance to our employment process.