Senior Fullstack Developer

About the Company At Avaron, you get the security of permanent employment combined with the variety of working at different customers. We place specialists across everything from tech, IT and industry to project management and business support – and whatever the assignment, you have a consultant manager who is there for you and your development. About the Role You will join a team that owns and evolves business-critical case management applications used by Customer Service in a regulated environment. These solutions are central to daily operations, stable service delivery, and a smooth experience for internal users. A large part of the work is focused on lifecycle management for legacy applications. That means modernizing existing solutions, reducing technical debt, upgrading platforms, and addressing security and lifecycle-related risks. At the same time, you will contribute to a modern Angular-based user interface supporting KYC-related case management processes. You will work as a hands-on senior team member with influence across both frontend and backend development. You will also help strengthen modern ways of working, including AI-assisted development, clean engineering practices, and long-term maintainability. This is a strong opportunity for you who enjoy combining modernization work with new development in a business-critical setting. Job Description You will maintain and further develop case management applications that support core operational processes. You will drive lifecycle management initiatives such as modernization, platform upgrades, and reduction of technical debt. You will contribute to the development of a modern user interface in Angular for KYC-related workflows. You will design, build, and improve scalable, secure, and user-friendly business applications across the full stack. You will support frontend development through collaboration, knowledge sharing, and guidance in Angular and frontend architecture. You will contribute to modern software engineering practices, including CI/CD, automated deployments, code reviews, and trunk-based development. You will help the team adopt AI-assisted development practices for areas such as testing, documentation, troubleshooting, and software quality. You will mentor team members and contribute to maintainable architecture and sustainable technical decisions over time. Requirements Strong fullstack development experience with solid frontend expertise. Experience with lifecycle management, modernization, maintenance, and technical debt reduction. Strong experience with Angular, TypeScript, REST APIs, and modern web development. Strong experience with .NET/C#, ASP.NET Core, and modern .NET development. Experience designing, developing, and maintaining scalable, secure, and user-friendly business applications. Experience with GitHub, GitHub Actions, CI/CD pipelines, code reviews, and automated deployments. Experience with automated testing and quality-focused development. Experience working with trunk-based development. You communicate fluently in Swedish and English. Nice to have Experience with .NET Aspire. Knowledge of event-driven architecture and Kafka. Experience with microservices, distributed systems, Kubernetes, and cloud-native platforms. Experience mentoring developers in Angular and frontend architecture. Experience from regulated industries, case management, KYC, insurance, or similar business domains. Experience using AI-assisted development tools in daily engineering work. What We OfferPermanent employment at Avaron AB Occupational pension Wellness allowance of SEK 5,000 per year Application Selections are made on an ongoing basis – apply as soon as you can.

Reaktor's tech community is looking for an experienced Senior Fullstack Developer to join one of our Business Units in Amsterdam. If you are comfortable working across modern web applications, backend services and production systems, enjoy solving ambiguous problems with clients, and are curious to work in a low-hierarchy environment, you might just be what we’re looking for. You will support clients across a range of digital product, platform and service domains. The exact client context may vary from focused product teams to large international companies working on high-traffic, business-critical services. Many of our clients are technically mature and expect a high level of expertise from our consultants. This means you will need to be hands-on, pragmatic and comfortable helping both the client and the team make good technical decisions. YOUR DAILY TASKS MAY INCLUDE: * Building and improving modern web applications, backend services, APIs and data models * Working across frontend, backend and infrastructure depending on the needs of the client project * Helping clients choose suitable technologies, architecture and delivery approaches * Contributing to cloud environments, CI/CD pipelines, deployments and production operations * Debugging, testing, monitoring and improving production-grade systems * Working on products or tooling related to customer-facing services, internal platforms, identity, martech, customer support, analytics, content, online stores, integrations, developer tooling or SDKs * Collaborating directly with client tech teams, business stakeholders, designers, product people and other disciplines * Clarifying ambiguous requirements and turning them into working software * Taking responsibility for delivery while making sure the team is supported and no one is left behind * Using modern development practices, including openness to AI-assisted development tools and workflows TO THRIVE IN THIS POSITION, YOU’LL NEED: MUST-HAVES * Strong experience in modern frontend development, for example with TypeScript and React or comparable technologies * Strong experience in backend service development, for example with Node.js, Java, Kotlin, Python or comparable technologies * Experience building, shipping and improving production-grade digital products * Comfortable working across the full delivery lifecycle, from implementation to testing, deployment and production operations * Understanding of cloud environments, CI/CD, deployments and how production systems are operated * Ability to work directly with clients, stakeholders and other disciplines in a senior, consultative role * Strong problem-solving skills and the ability to bring clarity to ambiguous product or technical situations * A hands-on mindset — you are technically credible, actively contribute to the work and help the team move forward * Fluent verbal and written English skills to collaborate in an international environment We do not have a hard requirement around years of experience, but we have noticed that this level of fullstack, client-facing and production ownership usually takes several years of professional experience to build. NICE-TO-HAVES * Experience from customer-facing digital products, online services, ecommerce, subscriptions, internal platforms, analytics, content, martech or similar product domains * Experience with high-traffic or business-critical production systems * Deeper experience with platform engineering, infrastructure-as-code or DevOps practices * Experience with customer-facing products, internal tools, integrations, SDKs or developer tooling * Familiarity with mobile development ADAPTABILITY Willingness to work in a hybrid setup. This means balancing office, client premises and remote work depending on the client project and team needs.