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 at scale. With 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.
What You’ll Do
- 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.
What We’re Looking For
- 8+ years of experience building backend systems with .NET .
- Strong understanding of API design , distributed systems, and asynchronous architectures.
- Experience with SQL and NoSQL databases (PostgreSQL preferred), caching, and queuing systems.
- Familiarity with cloud environments and DevOps 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.
Life at Keepnet
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.
Why This Role Is Different
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.
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