Senior Engineer, S-mobiili

Primary Location:

HELSINKI

Do you want to be part of a company that impacts the daily lives of most people in Finland? S Group is Finland’s biggest private employer and is now a significant digital employer.

Would you like to work with one of Finland’s most popular mobile apps? S-mobiili is S Group’s flagship application with over 2.5M users. It uniquely combines customer-owner services with S-Bank’s banking features, enabling users to manage daily banking, track bonuses, store receipts, and access personalized offers in one place. The app is built by a 40+ member international, cross-functional team that takes full ownership from ideation to operations. This is your opportunity to truly make an impact on people’s everyday lives. If this resonates with you, keep reading — and don’t miss the chance to join our S-mobiili team! 

Senior Engineer, S-Mobiili

We’re looking for an experienced Senior Engineer to take on the role of Lead Android Engineer in S-mobiili. We work in agile teams, organized in a team-of-teams model where squads take responsibility for their own areas while collaborating closely to ensure agility and knowledge sharing. In this role, you will be developing the features and functionalities of the S-mobiili application, working closely with business stakeholders, designers, developers, and QA engineers.

Our workplace is our Helsinki office, Ässäkeskus, where we meet with our colleagues several times a week. When your duties allow, you can also work remotely for part of the week with flexible arrangements.

Is This You?

At S-mobiili, we put great emphasis on building a reliable, high-quality app that our millions of users can trust every day. As our new Senior / Lead Android Engineer, you’ll share that passion — creating mobile experiences that are not only robust but also delightful to use. 

You bring strong experience with Kotlin and modern Android development practices, together with a deep understanding of software engineering principles. Clean architecture, maintainable code, and test-driven development (unit, integration, and UI tests) are second nature to you. Most importantly, you’re motivated by building great products that make a real difference in people’s daily lives, with a proactive attitude and eagerness to learn. 

What We Hope From You:

• Strong experience in Android mobile development (Kotlin, Jetpack Compose, RxJava, Dagger2, Custom UI). 
• Confidence in driving technical and architectural decisions, ensuring best practices, and taking ownership. 
• Capability to create processes and produce solid technical documentation. 
• Knowledge of Google Play Services and Google Play Store requirements.

• Information Security Knowledge.

• Good communication skills in English. 

In addition, it’s a plus if you have: 

• Experience in technical leadership and mobile accessibility. 
• Skills in test automation and DevOps (Android CI/CD, automated testing). 
• Familiarity with cloud platforms (e.g., AWS) and additional languages such as Java and/or Swift. 

What We Offer

On top of a respectful salary, superb company benefits, and the finest colleagues, this is what we offer in return:    

• An opportunity to improve and influence the daily lives of S Group’s employees and millions of people.
• A stable and flexible working environment based on cooperative values and principles.
• Influence and responsibility. Our engineers have a lot of freedom in their work, but they also live with their solutions, and so do millions of users. 
• Ownership. You’re creating services directly for the end-users. You’re not visiting a project; you own the product together with your team.  
• Workplace democracy. Our ways of working are not set in stone. Together we’ll continuously improve the ways of developing products and services.
• Concrete and rewarding results, that you can experience yourself by using S-Group’s services, when doing your grocery shopping, fueling, or staying in a hotel.  
• An opportunity to gain know-how and technical competence in wide-ranging technology domains (like web, mobile, and cloud) as well as business domains (restaurants, hotels, online retail, and service stations), a lot of diverse growth and job opportunities.         
• Occupational healthcare, sports, and culture benefits, lunch benefits in our staff restaurant, and access to the hobby and sports facilities in Ässäkeskus.  

Interested? - We’ll be happy to hear from you  

Please send us your CV and an application highlighting your task-related skills by October 12, 2025, at the latest.   

We will actively review applications and invite the most suitable candidates for further discussion. We will notify all applicants about the decision within two weeks after the deadline.   

You’ll meet our recruiter, hiring manager, and some of your colleagues during our recruitment process. The last step of our process is the suitability assessment.

As part of the S-mobile team, you’ll be working with financial and banking solutions and handling sensitive data. For this reason, a routine security check is required, which may include reviewing credit history, corporate affiliations, and completing the necessary security clearance. 

At S-Group, we are committed to working in a diverse and inclusive work environment where all our employees' unique backgrounds, skills, and perspectives are respected and valued. 

At SOK IT & Development, we are a group of 500 diverse and talented professionals, each bringing a unique perspective and skill set to our shared mission. As part of the S-Group, Finland’s largest private employer with over 40,000 employees, we are entrusted with guiding the future of one of the most impactful organizations in Finland.

Our responsibility is clear – we provide strategic guidance and technological expertise to support all areas of the S-Group. We are uniquely positioned inside S-Group with billions of rows of data from multiple use cases and business domains, all intimately connected to Finns as they/we go about our daily routines. We build SW products, apps, and services highlighted by the regular dialogue between digital and IRL worlds, which genuinely makes our work consistently intriguing. We are design conscious, we believe in community internally and externally, pride ourselves on our open source commitment, our progressive path towards an Agile and DevOps culture, and our use of modern tools and democratic development standards for a holistic philosophy to modern and pure software development practices.

Read more about SOK Digital Development: https://www.s-group.dev/    

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