Senior Node.js Developer; Belgium

Who We Are

Flosum is a bootstrapped, profitable B2B SaaS company building the leading Salesforce-native Dev Sec Ops , Data Protection, and Security platform. Our solutions are trusted by Fortune 500 enterprises in the most heavily regulated industries on the planet — financial services, healthcare, government, and insurance.

We’re not a startup burning cash and chasing vanity metrics. We’re a proven, scaling business that reached profitability on our own terms. As a Salesforce Summit Partner and Innovation Award winner, we’ve earned our seat at the table alongside the biggest names in enterprise software.

Built 100% on the Salesforce platform. Serving enterprises that demand zero compromise on security, compliance, and reliability.

We are entering an aggressive growth phase — expanding our product surface, deepening our platform capabilities, and accelerating our delivery velocity. We need senior-caliber Node.js developers who can own significant parts of our architecture and ship production code that enterprise customers depend on daily.

This is not a staff augmentation seat. You will work directly with engineering leadership, product managers, and the CEO. Your decisions will have real consequences, your opinions will be heard, and your craftsmanship will be visible to the customers who rely on our platform.

• High-performance backend services and APIs powering enterprise-grade SaaS applications
• Scalable, secure Node.js micro services and integrations within the Salesforce ecosystem
• Modern front-end experiences using Vue.js and Type Script that serve demanding enterprise users
• CI/CD pipeline tooling, automation frameworks, and developer productivity infrastructure
• Real-time data processing and event-driven architectures handling sensitive enterprise data at scale

Read this section carefully. We are specific about what we need because we are serious about who we hire.

• 5+ years of professional Node.js development in production environments — not tutorials, not side projects, not bootcamp exercises. Real production systems serving real users at scale.
• Expert-level understanding of asynchronous programming, event loops, streams, and the Node.js runtime. You should be able to explain back pressure, the differences between set Immediate and process.next
  
  Tick, and why unhandled promise rejections are dangerous — without Googling it.
• Deep experience with Type Script in production codebases. We write typed code, and we expect you to understand why.
• Strong command of RESTful API design, authentication patterns (OAuth 2.0, JWT), and API security best practices for enterprise environments.
• Proven experience with SQL and No
  
  SQL databases, query optimization, data modeling, and understanding the performance implications of schema decisions at scale.
• Proficiency with Git workflows, code review practices, automated testing (unit, integration, and end-to-end), and CI/CD pipelines.
• Solid understanding of containerization (Docker), cloud services (AWS/GCP/Azure), and infrastructure-as-code principles.

• Salesforce development experience:
  Apex, Lightning Web Components (LWC), Visualforce, or Salesforce API integrations. If you know both Node.js and Salesforce, you are a rare and extremely valuable candidate to us.
• Experience building or contributing to Salesforce ISV (App Exchange) products.
• Vue.js front-end development experience, particularly with Vue 3 Composition API and state management.
• Experience working in B2B SaaS companies serving enterprise customers with strict compliance requirements (SOC 2, HIPAA, FedRAMP, GDPR).
• Familiarity with Dev Ops/Dev Sec Ops  tool chains and practices in the Salesforce ecosystem.

Skills get you in the door. Mindset determines whether you thrive here:

Missionary, Not Mercenary

You care about what you’re building and why. You take ownership not because someone assigned it to you, but because that’s who you are. When something is broken at 2 AM, you don’t check whether it’s “your responsibility” — you fix it.

Builder, Not a Bystander

You don’t wait for…