Senior Backend Engineer - .NET & Python, GenAI

Benifex Limited; Greater London; Hybrid; GBP 70,000 - 90,000; Full time

Benefits offered by this job

MacBook Pro or equivalent

Annual learning budget £800

Focus Fridays 2 hours weekly

Flexible work setup with monthly in‑c

Birthday off

Healthcare cash plan

Employee Assistance Plan 24/7

Income protection

Life insurance 4x salary

Referral bonuses

Enhanced parental leave

Work from Anywhere 90 days

Benifex card £50 monthly allowance

Job summary

Benifex Limited is seeking a Software Engineer with strong .NET and Python expertise and hands-on GenAI experience to help build Brain, Benifex's flagship AI platform. You will design, develop and deliver high-quality backend solutions that combine AI technologies with our benefits platform in a distributed team setting.

You will collaborate with Product, Design and Engineering to ship impactful features, improve reliability and help shape AI-first software practices, while working in a flexible

Qualifications

• Commercial experience developing backend applications using C#, .NET/.NET Core, Python and SQL.
• Production GenAI experience with AI tooling and observability.
• Experience delivering features end-to-end in modern engineering environments.
• Understanding of software quality, performance and security best practices.

Responsibilities

• Design, develop and deliver new features for Brain, integrating AI capabilities with Benifex's wider platform.
• Build and maintain backend services and APIs using .NET and Python.
• Own code quality, testing, troubleshooting and continuous improvement.
• Collaborate with Product, Design and Engineering teams to deliver customer-focused solutions.
• Improve platform reliability, observability, performance and security.
• Help evolve Benifex's AI-assisted development practices and support other engineers.

Skills

C#

Python

SQL

.NET Core

GenAI

CI/CD

Tools

Kubernetes

GCP

Grafana

Prometheus

Terraform

Job description

Benifex Limited is seeking a Software Engineer with strong .NET and Python expertise and hands-on GenAI experience to help build Brain, Benifex's flagship AI platform. You will design, develop and deliver high-quality backend solutions that combine AI technologies with our benefits platform in a distributed team setting.

You will collaborate with Product, Design and Engineering to ship impactful features, improve reliability and help shape AI-first software practices, while working in a flexible