Senior Fullstack Mobile Engineer

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.

Nivoda: Where Innovation and Gemstones Meet At Nivoda, we are passionate about empowering jewelry retailers and gemstone suppliers to thrive in today's dynamic market. As the leading B2B diamond and gemstone marketplace, we are dedicated to providing an exceptional platform that connects jewellery businesses of all sizes with the global diamond supply. Our team of over 400 dedicated employees, many with a wealth of industry experience, have meticulously developed our award-winning platform that addresses the unique challenges of the jewellery sector. With Nivoda, you can buy and sell diamonds securely, efficiently, hassle-free, and at the most competitive prices. Engineering At Nivoda Technology is at the heart of Nivoda's business, powering everything we do. Within our remote-first team, we foster a culture of innovation and collaboration where engineers can thrive. Join us and be part of a dynamic environment that values creativity, empowers individuality, and recognizes excellence. Together, we push boundaries to deliver groundbreaking solutions and leave a lasting impact on the global industry. About the role At Nivoda, we're passionate about pushing the boundaries of innovation to empower our customers in the online jewelry industry. As a Senior Fullstack Engineer, you'll be at the forefront of this mission, collaborating directly with our business stakeholders and engineers to architect, develop, and launch groundbreaking products. Your expertise will span the full stack: from crafting intuitive, high-performance frontend experiences to designing robust backend systems that power them. The impact you will have on the role * Design, implement, and maintain fullstack features for high-performance, customer-centric experiences across the Nivoda platform, ensuring scalability, reliability, and security. * Build and iterate on frontend interfaces that are fast, accessible, and delightful to use. * Ensure adherence to best practices, coding standards, and quality guidelines throughout the development lifecycle. * Collaborate with product managers, architects, and stakeholders to define technical requirements and translate business needs into technical solutions. * Debug and resolve complex technical issues, providing timely support to internal teams and external customers. * Collaborate with cross-functional teams to identify and prioritize customer requirements and feedback. * Mentor junior developers and improve the quality of engineering work in the broader team. * Actively participate in discussions to improve the overall customer experience on the Nivoda platform. Minimum Qualifications and experience: * 5+ years of relevant experience in fullstack development, with strong proficiency in Node.js on the backend. * Solid frontend experience with a modern framework: we use React. * At least 2 years of experience working with GraphQL. * Strong foundation in database concepts, with at least 4 years of experience working with relational databases like PostgreSQL. * Proficient in Test-Driven Development (TDD) and committed to writing high-quality, maintainable code. * Good analytical and problem-solving capabilities. * B.S or M.S Tech degree in Computer Science, Computer Engineering. What we offer * Dynamic working environment in a rapidly growing company. * Work on cloud-hosted applications utilizing major AWS services. * Gain valuable experience in system design and architectural patterns. * Enjoy a pleasant, low-hierarchy work environment. * Engage in intellectually challenging work that contributes significantly to Nivoda's success and scalability. * Flexible working hours and a vibrant company culture. * Plenty of opportunities for growth and learning. * Unlimited holiday allowance. * Chance to join and contribute to a company during its exponential expansion phase.