Backend Software Engineer Team Lead

Software Engineer and a Game Changer?

Barona Professionals AB

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 As a Software Engineer, you will: 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 To succeed in this role, you likely have: 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. Contact person: 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. INDTECH

Senior Software Engineer (Backend) - Java & Kotlin

Qbtech AB

Would you like to take part in transforming healthcare? Qbtech is the global market leader in professional ADHD tests, providing tests that are both CE marked and FDA cleared for use as an aid in the assessment and treatment evaluation of ADHD for people age 6-60. Our vision is to transform healthcare by providing a complete system of leading objective tests, products and services that empowers clinical and financial decision-makers to improve outcomes and support patients to better understand their symptoms and treatment. Qbtech is present in 14 countries with offices in Stockholm, London and Houston. Over the next years, Qbtech will make significant investments into new products, technologies and people to further strengthen their services and product offerings with the aim of building an ecosystem with solutions for providers, clinicians and patients. About the role We are looking for a Senior Software Engineer (SSE) for backend works in our product engineering team with systems / services development for the Qbtech platform. Primary implementation languages are Java & Kotlin. The main focus of the work is coding (development) but an SSE works with the entire software delivery lifecycle. The role is based in Stockholm, Sweden and will report to Engineering Manager.  There is no possibility of a complete remote role. This is Hybrid with at least 3 days a week from office. Essential Duties and responsibilities Qbtech’s development of products and services are controlled by Qbtech Quality Management Systems, international standards and certificates as well as specific laws. In accordance with those, essential duties and responsibilities are: Develop and document new product features & stories. Code reviews for peers. Maintain and improve legacy code. Manage DevOps and cloud infrastructure provisioning. Manage software deployment. Troubleshooting/investigation of incidents and bug fixing. We are looking for someone who has Extensive development skills using Java and Kotlin. Strong problem-solving mentality. Knowledge of the Ktor framework. Knowledge of at least one well known test framework such as Junit. Good knowledge of network infrastructure related to web application (examples: load balancer, firewall, security groups, CDN etc.). Experience of working with service provisioning for at least one of the following cloud services platforms (AWS, Google Cloud, Microsoft Azure). Experience of an infrastructure as code (Terraform). Experience with containerization (Docker). Experience from working with Agile development methodologies. Excellent written and verbal skills. At least 6-8 years documented experience. Qualifications Required for Position: Bachelors / Master’s degree in Computer Science or related field. Fluent in English. What can Qbtech offer you? At Qbtech you will have the opportunity to work with something meaningful that helps people understand ADHD while transforming healthcare. You will work in an international environment together with some of the leading experts in the world. You will lead the development of best in class as well as first in class products and services – globally. There are plenty of opportunities to learn and grow and to expand into other technologies within the company. Qbtech also offers education and certifications in fields that are relevant to the technology used within the company.

Senior Software Engineer

Yubico

MEET YUBICO Yubico is a global leader in identity security and creator of the YubiKey, the original hardware-backed passkey. Publicly traded on Nasdaq Stockholm with headquarters in Sweden, the US, and Singapore, we protect everyone from everyday consumers to global enterprises with modern, phishing-resistant authentication. Why Join Our Mission? At Yubico, we are guided by a shared belief that your work matters. We operate under a cultural philosophy of Speed with Integrity, pushing the boundaries of technology to secure the AI frontier—protecting both human and agentic AI interactions—and leading the transition to post-quantum cryptography. In everything we do, we live by our core values: * Battle Friction: We constantly look for new ways to simplify our products, our work, and the user experience. * Inspire Higher: We think big, champion the open internet, and strive to do the right thing even when it is difficult. * One Team: We are open, responsive, and collaborative, overcoming challenges and celebrating our successes together. Aligned with our commitment to open standards, we foster a thriving builder ecosystem through the Yubico Developer Program, offering free open-source repositories, libraries, and SDKs to help developers rapidly integrate strong hardware authentication into any application. Through close collaborations with technical partners like Google, Microsoft, and Amazon, as well as newer frontiers like OpenAI, we continue to shape a safer digital world while donating security keys to protect vulnerable communities, journalists, and humanitarian groups worldwide through our Secure it Forward program. At Yubico, We Offer Yubico Values: We work to ensure that our employees have an open space to have their voices amplified to create a workplace where everyone feels like they belong. In support of this, our employees have created some pretty cool Employee Resource Groups that foster inclusion, help build community and connection across Yubico which all employees are welcome to join. Additionally, Yubico donates YubiKeys to organizations in need all over the world (you can read more about our work here). Social Connection: Relationships and connectedness matter, and we love spending time with our team! Our virtual workspace keeps us connected day-to-day whether it's through Yubico celebrating wins or our buzzing Slack communities. Check out our Life at Yubico Page on LinkedIn and our awards here. THE ROLE Yubico is looking for a Software Engineer to join the Platform team working on Yubikey as a Service. It is an Enterprise solution that customers use to manage the lifecycle of their credentials and YubiKey deployment at scale. You should have a passion for building the platform for Enterprise-grade applications. We are looking for a teammate who is proactive, works well within and across teams, and has a desire to do things right and learn. You will develop the platform to support products used by many top Enterprise companies and will get to see your work in use right away. Tasks and Responsibilities:  * Understand, enhance, maintain, and grow the platform that powers our services * Develop your skills in designing and developing a testable, scalable and globally-distributed set of services used by a variety of Enterprise customers * Work collaboratively across functions - Product Managers, Security, Infrastructure, UX designers, Support * Work with a variety of technologies and increase your experience in many areas, ranging from cloud platform services and REST design to data compliance and web security * Work collaboratively with a tight-knit, multi-national development team to create well-architected software * Participate in an on-call rotation and gain experience supporting business-critical Enterprise services BASIC QUALIFICATIONS * 3+ years of software development experience (or equivalent) * Experience building commercial software * Experience with back-end software development * Experience working with relational databases * Experience with one or more common web-backend languages such as (but not limited to) Java, Kotlin, Go, Python, JavaScript (Node.js), C#, Rust BONUS QUALIFICATIONS * Hands-on experience with Go and/or Java/Kotlin * Hands-on experience in one or more of the following technologies: Kubernetes, Docker, Redis * Experience with one of the three major cloud platforms * Authentication and authorization technologies, modern security practices   #LI-IR1 We are an equal opportunity employer, we value diversity and uphold an inclusive environment where all people feel that they are equally respected and valued. All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity or expression, age, marital status, religion, national origin, disability, protected Veteran status or any other characteristic protected by law. We'd love to learn about what you can add to our diverse team. We are an E-Verify Participating Employer.   Yubico does not accept agency resumes or referrals so please do not send them to our careers staff or employees. Yubico is not responsible for any fees related to unsolicited resumes or referrals.   Personal data submitted through this form is used for managing Yubico’s recruitment activities, which include facilitating any application you make, setting up and conducting interviews and tests for applicants, evaluating and assessing results and selecting candidates, and as otherwise needed in our recruitment and onboarding processes. The use of your personal data may also be necessary prior to entering into a contract with you (that is prior to offering you a job with Yubico). Your personal data will only be used for the purposes for which it was collected and in accordance with the Yubico Privacy Notice. We only keep your personal data for as long as necessary and in compliance with Yubico’s record retention policies. If you have asked us to, we will keep you informed of other opportunities at Yubico. We do this in various ways, including email and by phone. If at any time you do not want us to contact you or use your information as described herein please contact us at jobs@yubico.com to let us know and we will delete all such information. Providing your personal data is voluntary, but necessary to join our talent community, and if you do not agree to provide your data, we will not be able to consider you as part of our talent community.   As part of providing the requested service, we will transfer your data to be processed by Greenhouse Software Inc., a service provider contracted by Yubico AB and/or its subsidiaries that meets legally mandated privacy requirements. The Yubico Privacy Notice offers more information about Yubico privacy practices, including the lawful basis for processing of personal data, how to lodge a complaint with the supervisory authority, and how to contact Yubico to exercise your data subject rights. In this notice, when we refer to "Yubico", "us", "we" or "our", we mean the Yubico group company or companies that you apply to, or correspond with, and which are responsible for any personal data collected about you.