Flosum Logo

Flosum

Senior Node.js Developer (UK)

Posted Yesterday
Be an Early Applicant
Remote
Hiring Remotely in United Kingdom
Senior level
Remote
Hiring Remotely in United Kingdom
Senior level
Build and maintain high-performance Node.js backend services, APIs, microservices, Salesforce integrations, Vue.js and TypeScript front ends, CI/CD tooling, and event-driven systems. The role requires ownership of secure, scalable production software handling sensitive enterprise data, with collaboration across engineering leadership, product, and company leadership.
The summary above was generated by AI
Who We Are

Flosum is a bootstrapped, profitable B2B SaaS company building the leading Salesforce-native DevSecOps, 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.

Why This Role Exists

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.

What You’ll Build
  • 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 TypeScript 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

Requirements

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

Non-Negotiable Technical Requirements
  • 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 backpressure, the differences between setImmediate and process.nextTick, and why unhandled promise rejections are dangerous — without Googling it.
  • Deep experience with TypeScript 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 NoSQL 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.
Highly Preferred (These Will Set You Apart)
  • 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 (AppExchange) 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 DevOps/DevSecOps toolchains and practices in the Salesforce ecosystem.
The Kind of Person We’re Looking For

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 perfect specifications. You dig in, ask hard questions, propose solutions, and ship. You would rather have a working prototype by Friday than a polished slide deck by next quarter.

Craftsperson Under Pressure

Enterprise customers depend on our uptime and data integrity. You write code that doesn’t just work — it survives. You understand that in regulated industries, your code is your reputation.

Direct Communicator

You say what you think, respectfully and clearly. If a technical decision is wrong, you speak up — regardless of who made it. We value candor over politeness-at-the-expense-of-quality.

This Is a Long-Term Commitment

Let us be direct: we are not looking for contractors who jump between projects every few months. We are building a world-class engineering team, and we invest heavily in the people who join us. In return, we expect commitment.

This role is designed as a long-term, full-time engagement. You will grow with us. You will own systems end-to-end. You will see the direct impact of your work in how Fortune 500 companies build, protect, and deploy on Salesforce.

If you’re looking for a short-term gig while you wait for something else, this isn’t the role. If you want to build something that matters and be part of a team that’s scaling from strong to dominant, keep reading.


BenefitsWhat We Offer
  • Competitive compensation commensurate with your experience and impact
  • Direct collaboration with the founding team and engineering leadership — your voice will carry weight from day one
  • A profitable, stable company with aggressive growth plans — no funding anxiety, no runway clock
  • The opportunity to work on enterprise-grade products used by some of the largest organizations in the world
  • Meaningful technical challenges: security, compliance, scale, and reliability at the intersection of Node.js and Salesforce
  • A culture that rewards ownership, speed, and craftsmanship over politics and hierarchy
  • Remote-first flexibility with a results-oriented work environment

Similar Jobs

37 Minutes Ago
Easy Apply
Remote
United Kingdom
Easy Apply
Senior level
Senior level
Artificial Intelligence • Fintech • Hardware • Information Technology • Sales • Software • Transportation
Conduct red team operations, adversary simulations, and offensive security assessments across cloud infrastructure, identity systems, CI/CD pipelines, containers, and cloud-native services. Identify attack paths, validate vulnerabilities, assess detection and response coverage, track emerging attacker techniques, and drive remediation. Produce actionable reports and communicate technical findings to engineering, security, and business stakeholders.
Top Skills: Ci/Cd PipelinesCloud EnvironmentsCloud-Native ServicesContainerized WorkloadsGpenGxpnIamMitre Att&CkOscpOsep
37 Minutes Ago
Remote or Hybrid
Senior level
Senior level
Artificial Intelligence • Big Data • Cloud • Information Technology • Software • Big Data Analytics • Automation
Owns end-to-end recruitment for complex Sales roles across EMEA, especially DACH. Partners with senior Sales leaders, builds proactive talent pipelines, conducts talent mapping, analyzes recruiting and market data, and uses AI-enabled tools to improve sourcing and hiring outcomes. The role also champions candidate and hiring-manager experience while advising on talent availability, compensation, location, and competition.
Top Skills: Ai-Enabled Recruiting ToolsEnterprise SoftwareRecruiting TechnologySaaS
3 Hours Ago
Easy Apply
Remote
UK
Easy Apply
Entry level
Entry level
Big Data • Fintech • Mobile • Payments • Financial Services
Entry-level software engineering role for new graduates joining Affirm’s Instruments team. Responsibilities include contributing to team projects, writing clear and well-tested code, navigating large codebases, debugging, participating in code reviews, collaborating with global stakeholders, communicating trade-offs, and balancing delivery speed with system quality and reliability. The role is hybrid in London during the early-career program, with future remote or office flexibility.

What you need to know about the Belfast Tech Scene

If asked to name the birthplace of the RMS Titanic, you might not say Belfast. Similarly, if asked to name Europe's leading destination for foreign direct investment in new software development, Belfast might not come to mind. Yet, both are true. The city has emerged as a tech powerhouse, recently ranked among the best in the U.K. for tech careers — especially for software developers. It also leads the U.K. with the highest percentage of software development jobs advertised.

Sign up now Access later

Create Free Account

Please log in or sign up to report this job.

Create Free Account