Senior Software Engineer - Backend (Java, Spring Boot)

Job description

We are looking for a motivated and hands-on Senior Software Engineer to join the CRONUS Platform Team and strengthen the Identity module for Portfolio Brands. The role will focus on building secure, reliable and scalable backend services that support customer registration, login, authentication, authorization and personal-data protection. You will work with engineers, product managers, architects, security specialists and business stakeholders to improve Customer Identity and Access Management capabilities across Weekday, COS, ARKET and &Other Stories. You will contribute across the full development lifecycle, including design, coding, testing, deployment, monitoring and production support. This is a long-term strategic role with strong ownership. Over time, there will be opportunities to take broader technical leadership responsibilities within the team. WHAT YOU'LL DO As a Senior Software Engineer, you will design and deliver secure customer identity capabilities and production-grade backend services. Key responsibilities include: Design, build and maintain backend services using Java and Spring Boot. Develop and improve customer identity journeys, including registration, sign-in, password reset, account recovery, multi-factor authentication and social login. Integrate backend services with Azure AD B2C / Microsoft Entra External ID and other customer identity platforms. Implement secure authentication and authorization using OAuth 2.0, OpenID Connect and token-based security. Build reliable APIs and integrations for customer profile, consent, newsletter and related customer capabilities. Protect customer and personal data through secure design, access controls, privacy-aware data handling and appropriate operational controls. Design services for scalability, reliability, performance and maintainability. Improve observability through effective logging, monitoring, metrics, tracing and alerts. Own services across the full lifecycle, including automated testing, CI/CD, deployment, production support and continuous improvement. Investigate technical issues and production incidents, identify root causes and implement long-term improvements. Collaborate with security, architecture, product and engineering teams to turn business needs into practical technical solutions. Review code, support engineering standards, mentor colleagues and communicate technical risks and trade-offs clearly. Contribute to the future evolution of the CIAM landscape, including the adoption of new identity platforms such as Strivacity. WHO YOU'LL WORK WITH The CRONUS Platform Team is part of Portfolio Brands Tech and supports the digital commerce platform used by Weekday, COS, ARKET and &Other Stories. The team owns shared platform capabilities that help the brands deliver stable, secure and reliable customer experiences. The Platform Team works across five capability areas: Backend Engineering: Shared backend services and system-to-system integration services. Site Reliability Engineering: Reliability, availability, monitoring, alerts and performance engineering. Automation: Quality automation using Playwright and process automation using RPA. Operations: Incident management, problem management and platform stability. Security & Compliance: Security engineering, audits and compliance. You will work mainly within Backend Engineering and the Identity module, while collaborating closely with SRE, operations, automation, security and other product teams. The team values end-to-end ownership, open communication, shared learning and practical solutions that improve customer experience and business reliability. WHO YOU ARE We are looking for someone with strong backend engineering and customer identity experience, along with a collaborative and ownership-driven mindset. Overall Experience: 8-10 years of relevant software engineering experience, including designing, developing, testing and operating backend applications or services. Java: Strong and recent hands-on experience with Java 17+ and core Java concepts, including object-oriented design, collections, exception handling, concurrency and clean code. Spring Boot: Practical experience building production-grade REST APIs and microservices using Spring Boot and the wider Spring ecosystem. IAM / CIAM: Meaningful hands-on experience with customer identity and access management, including authentication, authorization, user identity, access control, identity journeys, customer profiles, consent and personal-data protection. Azure B2C: Experience with Azure AD B2C / Microsoft Entra External ID or a comparable CIAM platform. You should understand user flows or policies, registration, MFA, social identity providers, tokens and backend integration. Identity Standards: Good understanding of OAuth 2.0, OpenID Connect, JWT and token lifecycle management. Backend Engineering: Strong experience with API design, microservices, secure coding, databases, system integrations, performance, reliability and production support. Cloud & Containers: Experience with cloud-native development, Docker and Kubernetes. Azure experience is preferred. CI/CD: Experience with automated build, test and deployment pipelines. Databases: Practical experience with SQL and/or NoSQL databases, for example PostgreSQL or Cosmos DB. Testing: Experience with unit, integration, contract, security and performance testing. Observability: Experience with logging, monitoring, metrics, tracing and production alerting. Nice to Have Experience with event-driven systems and messaging platforms such as Azure Service Bus or similar technologies. Experience migrating between customer identity platforms or modernizing an existing CIAM solution. Exposure to Strivacity or another modern customer identity platform. Experience working with customer consent, preference or newsletter capabilities. Experience in e-commerce or another high-traffic customer-facing digital platform. And people who are Passionate about secure, reliable and simple customer experiences. Comfortable taking ownership and moving complex work from problem to production. Collaborative team players who work well in global, cross-functional environments. Proactive problem-solvers who balance technical quality with practical delivery. Able to explain technical choices, risks and trade-offs in clear language. Interested in mentoring colleagues and growing into broader technical leadership responsibilities. Curious and adaptable as technologies and identity platforms evolve. WHO WE ARE ​ H&M is a global company of strong fashion brands and ventures. Our goal is to prove that there is no compromise between exceptional design, affordable prices, and sustainable solutions. We want to liberate fashion for the many, and our customers are at the heart of every decision we make.​ We are made up of thousands of passionate and talented colleagues united by our shared culture and values. Together, we want to use our power, our scale, and our knowledge to push the fashion industry towards a more inclusive and sustainable future. ​ Help us re-imagine fashion and together we will re-shape our industry. Learn more about H&M here . WHY YOU’LL LOVE WORKING HERE ​ At H&M, we are proud to be a vibrant and welcoming company. We offer our employees attractive benefits with extensive development opportunities around the globe. ​ We offer all our employees at H&M attractive benefits with extensive development opportunities around the globe. All our employees receive a staff discount card, usable on all our H&M brands in stores and online. Brands covered by the discount are H&M (Beauty and Move included), COS, Weekday, Monki, H&M HOME, & Other Stories, ARKET, Afound. In addition to our staff discount, all our employees are included in our H&M Incentive Program – HIP. You can read more about our H&M Incentive Program here . In addition to our global benefits, all our local markets offer different competitive perks and benefits. Please note that they may differ between employment types and countries. JOIN US ​ Our uniqueness comes from a combination of many things – our inclusive and collaborative culture, our strong values, and opportunities for growth. But most of all, it’s our people who make us who we are.​ Take the next step in your career together with us. The journey starts here.​ *We are committed to a recruitment process that is fair, equitable, and based on competency. We therefore kindly ask you to not attach a cover letter in your application.