Benefex
Benefex
501 – 1,000 Employees
HR Tech
Benefex is an HR technology company developing workplace software focused on the employee experience. Its OneHub platform brings employee benefits, reward and recognition, wellbeing programs, and workplace communications together in one central service. Benefex works with organizations across multiple markets, with its technology supporting nearly one million employees in 30 countries.

Senior Backend Engineer (.NET and Python) at Benefex — Hybrid UK

Join Benefex as a Senior Backend Engineer developing Brain, its flagship AI-powered employee benefits platform. Build .NET and Python backend services, APIs, and generative AI capabilities.

Description

  • Create, develop, and deliver new features for Brain, Benefex’s flagship AI platform
  • Connect AI capabilities with Benefex’s broader platform
  • Build and maintain backend services and APIs with .NET and Python
  • Take ownership of released code through testing, troubleshooting, and ongoing improvement
  • Work closely with Product, Design, and Engineering colleagues
  • Strengthen platform reliability, observability, performance, and security
  • Contribute to the development of AI-assisted engineering practices
  • Provide technical support and guidance to fellow engineers

Requirements

  • Professional experience building backend applications with C#, .NET or .NET Core, Python, and SQL
  • Production experience with generative AI, including MCP, RAG, agent orchestration, evaluations, and observability tools
  • Knowledge of responsible AI principles and software quality, performance, and security practices
  • Experience delivering product features from inception through release in modern engineering teams
  • Familiarity with CI/CD, containerisation, microservices, and event-driven architectures
  • Strong collaboration skills with a proactive approach to problem-solving
  • Practical experience using AI coding assistants
  • Experience with Kubernetes, GCP, Google Pub/Sub, Kafka, or Redis is advantageous
  • Familiarity with Langfuse, Grafana, Prometheus, or Terraform is advantageous
  • Experience mentoring or supporting fellow engineers is advantageous

Benefits

  • Choose your preferred technology setup, including a MacBook Pro or equivalent and monitors
  • Annual learning budget of £800 or €800
  • Two hours each week designated as Focus Fridays
  • Flexible working arrangements
  • Discounts with hundreds of high-street brands
  • Salary-sacrifice schemes covering finance, health, technology, and more
  • 25 days of annual leave plus local bank holidays
  • A day off for your birthday
  • Two half-day wellbeing days
  • Healthcare cash plan
  • Employee Assistance Plan with round-the-clock, year-round support
  • Income protection covering 75%
  • Life assurance worth four times your salary
  • Employee referral bonuses
  • Enhanced parental leave, including 26 weeks of fully paid maternity leave and four weeks of fully paid paternity leave
  • Work-from-anywhere policy for up to 90 days
  • Holiday buy-and-sell scheme
  • £50 monthly allowance through the Benefex card

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