
Barona Professionals AB · Stockholm
Som mjukvaruutvecklare på St1 kommer du att spela en central roll i att utveckla AI-drivna arbetsflöden och innovativa mjukvarulösningar som påskyndar energiomställningen.
Som mjukvaruutvecklare på St1 kommer du att spela en central roll i att utveckla AI-drivna arbetsflöden och innovativa mjukvarulösningar som påskyndar energiomställningen.
Software Engineer – Building Software for the Energy Transition in the Age of AI
We are looking for an experienced Software Engineer to join St1’s Software Engineering team — a team operating at the intersection of energy transition and modern software development.
We build and operate software products and solutions across multiple business domains, owning the full lifecycle from idea to production. Whether it is charging or fueling your car, enabling an automated car wash, or tracking how used cooking oil becomes sustainable biofuel, the software behind these experiences is built by our team.
This role is for an engineer who enjoys working close to the business while bringing strong technical expertise. You will collaborate with business stakeholders, architects, and technical specialists from early discovery and solution design through implementation and delivery. You are comfortable translating business needs into technical solutions and challenging assumptions when needed.
Building software in the age of AI
At St1, AI is more than a coding assistant. We are exploring how software engineering should evolve in an AI-enabled world.
You will help shape new ways of working by building AI-integrated development pipelines, experimenting with agents, and exploring effective collaboration between humans and AI. We expect hands-on experience with modern AI tools, an understanding of their strengths and limitations, and curiosity to explore what comes next.
How you’ll help drive the change
Work in a forward-deployed delivery team, connecting technical possibilities with business and customer needs.
Collaborate with stakeholders, architects, technical specialists, and AI agents from requirements analysis through delivery.
Design, implement, test, and maintain scalable software solutions.
Contribute technical leadership and improve engineering practices across teams.
Build AI-enabled development tools and workflows and help shape AI-native ways of working.
Challenge existing approaches and evaluate emerging technologies to ensure sustainable solutions.
What you bring to the team
A strong software engineering foundation with hands-on experience using AI in development. You have built with AI tools, understand their limitations, and want to explore their future potential.
Solid experience with microservices and distributed systems.
A full-stack background with a strong backend focus.
Strong skills in Node.js (NestJS), TypeScript, .NET Core, and C#. Experience with Next.js, React, or Vue.js is a plus.
Experience with Google Cloud, CI/CD, and DevOps practices.
Understanding of architecture patterns such as DDD, SOLID, Hexagonal Architecture, and MVC.
Ability to write clean, testable, and maintainable code in both new and existing systems.
Hands-on experience with AI building blocks such as LLM APIs, RAG, vector databases, embeddings, agent frameworks, and standards such as MCP.
Strong communication skills and the ability to work effectively with both technical and non-technical stakeholders.
A proactive, collaborative, and solution-oriented mindset.
6+ years of software development experience.
A degree in Computer Science, Software Engineering, or equivalent experience.
Professional English skills; Nordic language skills are a plus.
Who are we looking for?
We are looking for people who recognize the St1 Spirit: Curious, Commercial, Committed, and Caring.
This means creating an environment where people can be themselves, raising challenges early, taking ownership when things get difficult, thinking beyond team boundaries, and continuously learning as technology evolves.
Bring your experience, your perspective, and your ambition. Tell us what you can do — and what you want to build next.
Why join St1?
Shape how St1 builds software in the age of AI.
Create impact through products and services used by millions every day.
Grow your career in software architecture, AI, data, or technical leadership.
Work with a talented Nordic engineering community.
Enjoy a culture built on trust, freedom, and responsibility.
Work from Helsinki or Stockholm with excellent employee benefits.
Contribute to St1’s vision of a more CO₂-aware energy future.
How we support your journey
At St1, your safety and wellbeing come first. We offer an inclusive, trust-based culture where you are encouraged to take ownership, explore ideas, and grow. You will have opportunities to collaborate across teams and countries, develop your skills, and contribute to meaningful technology solutions.
We offer competitive compensation, strong benefits, and an environment where your contribution matters.
What to expect after you apply
We welcome applicants from all backgrounds and are committed to an inclusive and equitable recruitment process.
Interested? Submit your CV and cover letter through the Barona Career site by Thursday, 14 August 2026.
For more information, please contact us during the August calling hours: Tuesday, 4 August, or Thursday, 6 August 2026, between 12:00 and 14:00.
Barona Recruitment Team Lead Lassi Jyrinsalo
Phone: +358 40 762 8992
Email: lassi.jyrinsalo@barona.fi (mailto:lassi.jyrinsalo@barona.fi)
Let’s challenge the ordinary.
St1 är ett företag som driver energiomställningen och är verksamt i Finland, Sverige, Norge och Storbritannien. St1s energiportfölj omfattar oljeprodukter, biogas, hållbart flygbränsle (SAF), förnybar diesel (HVO) och solenergi. St1 driver också flera större projekt inom energiomställning. Forward Deployed Engineer (AI & mjukvara) Om St1 St1 är ett företag inom energiomställning med visionen att bli den ledande producenten och försäljaren av CO₂-medveten energi. Vi är verksamma i Finland, Sverige, Norge och Storbritannien. Vår portfölj omfattar oljeprodukter, biogas, hållbart flygbränsle (SAF), förnybar diesel (HVO) och solenergi. Med 1 150 servicestationer i Finland, Sverige och Norge är vi ett team på över 1 000 nyfikna, engagerade och omtänksamma medarbetare som tillsammans arbetar för att förändra spelplanen. Om rollen Som Forward Deployed Engineer kommer du att arbeta i gränslandet mellan St1:s verksamhet och teknik. Du kommer att samarbeta direkt med verksamhetsteamen för att omvandla verkliga operativa utmaningar till praktiska AI- och mjukvarulösningar. Detta är en roll med fokus på praktiskt genomförande – inte en traditionell ingenjörsroll bakom kulisserna. Du kommer att arbeta nära team inom detaljhandel, energihandel och raffinaderiverksamhet för att identifiera möjligheter, bygga lösningar och ta idéer från prototypstadiet till mätbara affärsresultat. Rollen passar en ingenjör med några års erfarenhet som trivs med att arbeta snabbt, lösa otydliga problem och samarbeta nära användare. Du kommer att samarbeta med seniora ingenjörer, arkitekter och plattformsteam som stöttar dig i att bygga skalbara lösningar. Ditt uppdrag: att hjälpa till att ta prioriterade användningsfall från idé till värde på veckor – inte kvartal. Så skapar du påverkan Du kommer att: Arbeta nära affärsenheter och koncernfunktioner för att identifiera, prototypa och leverera lösningar från St1:s lista över användningsfall. Bygga snabba prototyper och proof-of-concept-lösningar, validera dem tillsammans med intressenter och stödja välgrundade beslut om vidareutveckling. Driva den dagliga tekniska leveransen samtidigt som du gör pragmatiska tekniska val. Använda AI-stödda utvecklingsmetoder och agentbaserade arbetssätt för att påskynda leveransen samtidigt som kvalitet, säkerhet och efterlevnad bibehålls. Översätta verksamhetsbehov till tekniska lösningar och återföra lärdomar till St1:s tekniska färdplan. Arbeta nära slutanvändare, AI- och datateam, mjukvaruutvecklare, arkitekter och plattformsteam. Hjälpa till att omvandla lyckade pilotprojekt till produktionsklara lösningar. Säkerställa att lösningar följer St1:s krav på AI-styrning, datahantering, säkerhet och efterlevnad. Vad du bidrar med Vi söker någon som är nyfiken, samarbetsinriktad och driven av att skapa verklig påverkan. Du har sannolikt: En gedigen teknisk bakgrund med några års erfarenhet av att bygga och leverera mjukvaru- eller AI-lösningar. Praktisk erfarenhet inom minst ett område såsom tillämpad AI, molnplattformar, data engineering eller maskininlärning. Ett starkt leveransfokus och förmåga att skapa prototyper och iterera tillsammans med användare utan teknisk bakgrund. Förmåga att omvandla operativa utmaningar till praktiska tekniska lösningar. Erfarenhet av moderna utvecklingsmetoder: API:er, integrationer, versionshantering, testning, driftsättning och AI-stödda utvecklingsverktyg. Flytande engelska; kunskaper i finska, svenska eller norska är meriterande. Vilja att ibland resa till St1:s anläggningar i Norden och Storbritannien. Vem vi söker På St1 värdesätter vi personer som utmanar, samarbetar och utvecklas. Vi kallar detta St1 Spirit: att vara nyfiken, affärsmässig, engagerad och omtänksam. Det innebär att skapa en miljö där människor vågar uttrycka sina åsikter, tar ansvar när saker blir utmanande, tänker bortom de egna teamgränserna och ständigt fortsätter att lära sig. Ta med dina kunskaper, din ambition och din nyfikenhet – och hjälp oss att utmana det vanliga. Varför börja på St1? Skapa synliga affärsresultat genom teknik och AI. Arbeta direkt med verkliga operativa utmaningar. Lära av erfarna ingenjörer och arkitekter samtidigt som du utvecklar din karriär. Bygga moderna AI-drivna lösningar som en del av en nordisk teknikorganisation. Bidra till St1:s energiomställning inom detaljhandel, energihandel och raffinaderiverksamhet. Arbeta från Helsingfors, Åbo eller Stockholm med mycket goda förmåner. Så stödjer vi din utveckling På St1 kommer säkerhet, välmående och förtroende alltid först. Vi erbjuder en inkluderande kultur där du får ta ansvar, utforska nya idéer och utvecklas. Du får möjlighet att samarbeta över landsgränser, utveckla dina färdigheter och bidra till meningsfullt arbete med verklig påverkan. Rekryteringsprocess Vi välkomnar sökande med olika bakgrunder och är engagerade i en inkluderande och rättvis rekryteringsprocess. Skicka ditt CV och personliga brev via Barona Career senast torsdag 14 augusti 2026. För mer information, kontakta Baronas rekryteringsteamledare Lassi Jyrinsalo under telefontiderna i augusti: Tisdag 4 augusti 2026, kl. 12.00–14.00 Torsdag 6 augusti 2026, kl. 12.00–14.00 Lassi Jyrinsalo +358 40 762 8992 lassi.jyrinsalo@barona.fi Låt oss utmana det vanliga! INDTECH
We love elegant code, and we hope you do too. We look forward to seeing your craft grow and make a difference to our rapidly expanding platform. Sellpy's vision is to empower everyone to live circularly. We believe that every item deserves a second life, and we see huge value in making sure this happens. We look for those who share this vision and have the grit to tackle the challenges of building a circular future. Junior Software Engineer at Sellpy Sellpy's catalogue holds 10 million one-of-a-kind items — and our systems must handle every single one in real-time. As a Junior Software Engineer, you'll step into a place where your code ships to production early, your ideas are heard from day one, and the problems you solve have genuine environmental impact. We're coding for a circular future in an environment where discussions are encouraged, every voice contributes to our architecture, and curiosity and craft are valued equally — from day one. In short, you will Build and ship features across the full stack, from frontend interfaces to backend services. Work with JavaScript, React/React Native and Node.js. Take end-to-end ownership of features — from design through deployment. Grow rapidly with the support of experienced teammates and direct feedback loops. Contribute to keeping Sellpy's architecture clean, maintainable and scalable. Bring fresh perspectives that push our engineering culture forward. Requirements Currently pursuing or recently completed a B.S. or M.S. in Computer Science or a related technical field. Graduating in summer 2026, or 2027. Solid understanding of JavaScript or another modern programming language. Genuine curiosity, drive to learn, and an action-oriented attitude. We’d be impressed if you have Familiarity with React, Node.js, or similar modern frameworks. Experience from side projects, internships, or open source contributions. Exposure to CI/CD pipelines and version control with Git. A passion for the circular economy or sustainable tech. You get to Be part of a tech-minded company driving the change towards a sustainable lifestyle. In return, you'll get direction, energy, and meaningful challenges from day one. Enjoy a vibrant office culture at Medborgarplatsen, balanced with hands-on experience at our production sites Work with highly skilled and motivated colleagues who invest in your growth. Gain new skills with unlimited access to a learning platform. Make use of prepaid vacation. Enjoy Sellpy credits and staff discounts at Sellpy and the H&M brands (Arket, COS, Other Stories, Weekday and more). Save up with a monthly pension plan. Engage in Sellpy’s social traditions with game nights, interactive planning days, guest speakers and other activities. Location On-site collaboration at our core, supported by a flexible hybrid setup on set days. This role is based at our Medborgarplatsen office. Hybrid work We value being together. After an on-site onboarding, we aim for a balanced office presence, with flexibility on set days. Form of employment: Full-time, permanent employment with a 6-month probationary period. Start: As agreed upon
We put items to better use. Hundred thousand a week actually. Enhancing our technical product is therefore at the top of our agenda. The scale of our operations creates complex, fascinating challenges. We thrive on engineering simple, elegant solutions to tackle them, and we are looking for someone whose craft can make a tangible impact on our rapidly growing customer base. Sellpy’s vision is to empower everyone to live circularly. We believe that every item deserves a second life, and we see huge financial, social and environmental value in making sure this happens. We look for those who share this vision and have the grit to tackle the challenges of building a circular future. Fullstack Engineer at Sellpy Sellpy serves both buyers and sellers, and both sides matter equally. As part of Sellpy Tech, you'll help hundreds of thousands of customers embrace a smarter, more sustainable way to shop. This is work that actually moves the needle on something that matters. We're looking for a Fullstack Engineer who cares about the customer experience and wants to push our technical product forward. This role is a great fit if you want to go deep on JavaScript, enjoy technical discussions, and thrive on real, varied challenges every day. Your ability to build features that integrate cleanly with our architecture and hold up in production is what makes the difference. We code for a circular future — and we build it together. Debates are welcome, opinions are expected, and everyone has a real say in how we shape Sellpy's architecture. In short, you will Build user-centric, next-generation web applications Work with JavaScript, React/React Native & Node across the stack Take ownership of features from idea to release and beyond Ensure scalability, maintainability and simplicity in everything you build Continuously improve Sellpy’s products and architecture Requirements B.S. or M.S. in Computer Science (or related), or equivalent proven experience 3+ years of professional software engineering experience Strong knowledge of JavaScript Experience from a fast-paced product environment Fluency in written and spoken English We’d be impressed if you have Experience with React, React Native, Node.js, Web Components, logging & monitoring Worked in a scaling, product-focused startup Hands-on experience with continuous integration & deployment Knowledge of AWS and Git You get to Be part of a tech-minded company that's driving the change towards a sustainable lifestyle. In return, you will get direction, energy, and work on meaningful challenges daily. Enjoy a vibrant office culture at Medborgarplatsen, balanced with hands-on experience at our production sites Work with highly skilled and motivated colleagues Gain new skills with unlimited access to a learning platform Make use of prepaid vacation Enjoy Sellpy credits and staff discounts at Sellpy and the H&M brands (Arket, COS, Other Stories, Weekday and more). Save up with a monthly pension plan Engagement in Sellpy’s social traditions with game nights, interactive planning days, guest speakers and other activities. Location On-site collaboration at our core, supported by a flexible hybrid setup on set days. This specific role is based at our Medborgarplatsen office. Hybrid work We value being together. After an on-site onboarding, we aim for a balanced office presence, with flexibility based on your team and tasks. Form of employment: Full-time Start: As agreed upon Öppen för alla Vi fokuserar på din kompetens, inte dina övriga förutsättningar. Vi är öppna för att anpassa rollen eller arbetsplatsen efter dina behov.