Backend Engineer

• 3+ years experience as a Backend or Software Engineer

• Strong experience with modern backend languages and frameworks (must have a working ability in Golang and Typescript)

• Experience designing and consuming APIs (REST, event-driven systems)

• Solid understanding of databases (SQL / PostgreSQL) and data modelling

• Experience building and scaling production systems

• Familiarity with cloud infrastructure and CI/CD workflows

• Comfortable working with integrations and third-party services

• Experience using AI tools (e.g. ChatGPT, Claude) as part of your workflow

• Clear communicator who works well with both technical and non-technical stakeholders

• Proactive, detail-oriented, and comfortable taking ownership

• Help shape the future of employee benefits

• Competitive base salary and commission

• Meaningful equity in an early stage growing business

• Flexible hybrid working from day one

• Access to your own Happl benefits platform

• Optional enrolment in Private Health Insurance

• Optional enrolment in Dental insurance, including family cover

• A flexible Wellbeing budget to spend on whatever wellbeing means to you

• Learning & Development (L&D) allowance

• Pension scheme from day one

• Rapid career progression in a scaling engineering team

We're building the next generation of employee benefits infrastructure.

At Happl, we help global teams design, manage, and scale benefits that actually work for their people by using AI, across flex allowances, benefits, insurance, recognition, and wellbeing, all in one intelligent platform.

As a Backend Engineer at Happl, your mission is to build the systems that power a global, AI-first benefits platform.

You'll design, build, and scale backend services that are reliable, secure, and performant, enabling our product teams to move fast while supporting complex real-world use cases across payroll, finance, and employee benefits.

This role is for someone who enjoys ownership, thrives in fast-moving environments, and wants to build foundational systems that directly impact how companies support their people.

This is a hybrid role based in London, with an expectation of working from the office at least 2-3 days per week.

Location: London, Holborn
Team: Engineering
Working arrangement: Hybrid (3+ Days in Office)

This role sits within our Engineering team and works closely with Product, Frontend, Data, and Customer teams across the full development lifecycle.

You'll help shape how we build and scale our backend by focusing on:

• Designing and scaling the backend architecture powering a global, AI-first platform

• Building and owning core services across benefits, allowances, payments, and reporting

• Developing scalable data models and ensure integrity across systems

• Improving platform reliability, performance, security, and observability

• Automating workflows and Go Rules to streamline complex operations

• Collaborating closely with product and frontend teams to ship end-to-end features

• Writing clean, well-tested, production-ready code

• Using AI tools to accelerate development and iteration

• Contribute to architecture, technical decisions, and engineering standards

You'll play a key role in ensuring Happl's backend scales as our customer base, features, and global footprint grow.

If you don't meet every requirement but feel this role fits your trajectory, we'd still love to hear from you.