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
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-havesExperience 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
Willingness to work in a hybrid setup. This means balancing office, client premises and remote work depending on the client project and team needs.
Skills Required
- Strong experience in modern frontend development (e.g., TypeScript and React or comparable)
- Strong experience in backend service development (e.g., Node.js, Java, Kotlin, Python or comparable)
- Experience building, shipping and improving production-grade digital products
- Comfortable across full delivery lifecycle: implementation, testing, deployment and production operations
- Understanding of cloud environments, CI/CD, deployments and production operations
- Ability to work directly with clients, stakeholders and other disciplines in a senior, consultative role
- Strong problem-solving skills and ability to clarify ambiguous requirements
- Hands-on mindset; technically credible and actively contributes to team delivery
- Fluent verbal and written English
- Willingness to work in a hybrid setup (office, client premises and remote)
- Experience with customer-facing digital products, ecommerce, analytics, martech or similar domains
- Experience with high-traffic or business-critical production systems
- Deeper experience with platform engineering, infrastructure-as-code or DevOps practices
- Familiarity with mobile development
What We Do
Strategy, design, creative, high performance engineering, and unmatched execution. Consultancy and agency services, built on exceptional technological competence. We make future products and services, and help our clients adapt and remain ahead in an increasingly complex and changing world. What are we like? We have a global reach, a Nordic touch, a boutique approach, and an exceptional ability to scale and take on projects of any caliber. We are lateral thinkers that apply human, cultural, and technological understanding to create meaningful solutions to challenging problems. We’re famous for making things happen. Our unmatched execution capability is founded in superior technological skills and a strong maker culture. We are leaders by example on the forefront of the workplace revolution, changing how the world works and sharing everything we know.
