Senior Full-Stack Developer

Job Description

Flux is a technology-driven company based in Amsterdam (IJburg). We build SaaS solutions for the commercial real estate sector. Our platform supports real estate valuers in their daily work — streamlining valuation workflows, improving data exchange, and connecting valuers with banks and tax authorities.

We are looking for an experienced developer with strong frontend knowledge who enjoys building well-crafted systems, cares about quality, and combines a strong grasp of the fundamentals behind the technologies they use with a continuous drive to explore and apply new technologies in practice.

Main Tasks & Responsibilities

• As a developer, you will take ownership of the full Software Development Life Cycle (SDLC) of our SaaS services — from design and development to deployment and operations.
• We are a small, international team of full-stack developers with different strengths across backend, frontend, and DevOps. We follow an agile way of working (Scrum) and collaborate pragmatically across those areas.
• You will report directly to the CTO, reflecting our relatively flat structure and focus on ownership and results.
• Our platform consists of several standalone legacy systems that are still critical to the business today. At the same time, we actively evolve this landscape by incrementally migrating towards a new architecture, using well-established migration patterns rather than big-bang rewrites.
• Alongside this, we are investing in how we structure and use data across the platform — improving consistency, models, and integrations, and creating a stronger foundation for future capabilities. This also opens up opportunities to apply AI in a meaningful way, both in the product and in how we build it.
  
  

Job Requirements

We’re looking for a developer who..

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• currently already resides in The Netherlands (we can only support on visa sponsorship, not on relocation)
• has a structured and thoughtful way of working
• communicates clearly and effectively
• has at least a C1 level of English; Dutch is a plus, as it is the primary language of our clients
• enjoys going deeper into technology and understanding how things work
• naturally asks “why” and thinks through technical and architectural decisions
• is interested in software architecture and long-term solution design
• prefers a hands-on engineering role (not focused on team leadership)
• enjoys working across the full stack and taking responsibility for what they build and maintain
  
  

We value strong expertise in React and other technologies within our stack.

• Frontend: MUI with theme customization, Strong HTML/CSS skills with focus on accessibility

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• .NET (as backend technology)
• AWS (or equivalent experience with cloud platforms and/or on-premise infrastructure)
• SQL Server, SSRS (or relevant database experience)
• GitHub
  
  

What We Offer

At Flux, you work in an environment where you can make a real impact. We keep things practical, with short lines and direct communication, so ideas quickly turn into decisions and execution. We take a pragmatic approach to technology — focusing on understanding it, applying it where it makes sense, and continuously improving how we build, including how we use data and AI. As a small team, you get ownership and responsibility, while being part of a broader environment through our collaboration with Brainbay.

Benefits Include

• Attractive salary: €75K annually, depending on skills and experience
• Bonuses: 13th-month bonus included
• Ample time off: 37 vacation days per year

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• Pension plan: pension scheme with 4% employee & 8% employer contribution via Zwitserleven
• Tech essentials: Choose your preferred laptop and mobile phone, or receive a €30 net monthly reimbursement for private use
• Commuting support: Travel allowance (€0.23 per km) or 100% public transport reimbursed (NS Business Card)
• Hybrid work setup: Flexible home-office options with a €2.45 daily allowance for home working days
• Professional development: €1,500 annual training budget for growth opportunities
• Extra’s such as various events, bike scheme, collective insurance etc.
  
  

About Flux

At Flux, we are building a professional, proud, and enthusiastic organization.

• We believe strong collaboration comes from knowing each other beyond just work. That’s why we regularly organize activities and events — not as a formality, but to build trust, openness, and a culture where people can rely on each other.
• Across Flux, often together with Brainbay (our sister company within NVM), we support this through knowledge sharing, regular hackathons, AI inspiration days, and by providing space and budget for continuous learning.
• As a small company, growth is not about moving into management roles. Instead, for our engineering team, this means growing as engineers — deepening expertise, broadening across technologies and stacks, and developing a stronger architectural perspective over time.
  
  

Acquisition in response to this vacancy is not appreciated