Senior Fullstack Developer

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. Benefits - At Reaktor Amsterdam, our benefits and perks evolve with our community, and we’re always open to new ideas that will support the wellbeing of Reaktorians. Currently, we offer the following perks: - Tools: a top-spec computer and a phone to work with and use at work and home - Phone & internet: unlimited phone plan and home internet - 7% pension plan - Extensive health insurance - Mental health support - Wellbeing benefit with YourCampus - Commuting benefit with NS card - We’re an equal opportunity employer