Senior Backend Developer (.NET | AI-First SaaS Platform

Compensation:
Competitive, based on location and experience

Location: UK (Hybrid – Office & Remote)

Keepnet is an AI-driven SaaS platform experiencing strong, sustained growth in the UK with growing global momentum, helping organisations manage human cyber risk h Agentic AI live in production
, Keepnet runs autonomous systems that plan, build, and operate security awareness and human risk workflows, supported by strong guardrails and observability.

We’re looking for a Senior Backend Developer who wants to build production-grade backend services that power these systems, working in a multinational, AI-first engineering team where quality, ownership, and long-term thinking matter.

• Design, build, and maintain scalable backend services for Keepnet’s Human Risk Management platform.
• Build clean, modular APIs that integrate internal services and third-party systems to enable automation, reporting, and security workflows.
• Develop testable, maintainable codebases using principles such as Clean Architecture, DDD, and TDD.
• Own the full development lifecycle
  : design, implementation, CI/CD (Azure), and post-release monitoring.
• Work on distributed and asynchronous systems using message queues, background workers, and event-driven workflows.
• Use observability signals (logging, metrics, tracing, tools like Sentry) to proactively detect, diagnose, and prevent production issues.
• Collaborate closely with frontend, product, and customer-facing teams to deliver features that solve real customer problems.
• Participate in Agile ways of working
  , focused on iteration, ownership, and continuous improvement.

• 8+ years of experience building backend systems with .NET
  .
• Strong understanding of API design
  , distributed systems, and asynchronous architectures.
• Experience with SQL and No
  
  SQL databases (Postgre
  
  SQL preferred), caching, and queuing systems.
• Familiarity with cloud environments and Dev Ops practices (Azure preferred).
• Comfortable working on production SaaS platforms
  , with ownership beyond deployment.
• Experience using AI-assisted development tools (e.g. Cursor or similar) to support code exploration, refactoring, testing, or design discussions—while maintaining strong engineering judgment.
• A strong sense of ownership and production accountability
  , including monitoring, debugging, and continuous improvement.
• Ability to understand product and business context
  , making pragmatic technical decisions that balance user value, risk, and long‑term goals.
• A security‑conscious mindset
  , building systems that are secure by design.

At Keepnet, engineering is about craft, collaboration, and impact
.

What you can expect:

• Hybrid Working: A balance of in‑office collaboration and remote focus time.
• Thoughtful Engineering: Time and space to design systems properly, not just ship quickly.
• Global Context: Work on a multinational SaaS platform used across multiple regions.
• AI-First Environment: AI‑assisted development and production‑grade AI systems are part of everyday work.
• Annual Leave: 25 days (+1 per year of service).
• Health & Well‑being: Gym support and cycle‑to‑work scheme.
• Team Culture: Monthly team lunches and quarterly offsites.
• Continuous Learning: Learn from experienced peers and grow your skills over time.

This role is for engineers who:

• Care about system design and long‑term maintainability
• Enjoy working with experienced peers who challenge each other constructively
• Prefer preventing incidents over reacting to them
• Want to build software used by real customers at real scale
• Believe good engineering is as much about ownership and judgment as it is about code

If that sounds like you, we’d love to talk.