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# Senior Software Engineer - EO

- **Company:** Personio
- **Location:** London, United Kingdom (Remote available)
- **Experience:** Expert
- **Salary:** £70,437
- **Contract:** Temporary contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Artificial Intelligence, Code Review, Management of Software Versions, ReactJS, Backend, Kotlin, Front End Software Development
- **Published:** November 1, 2026
- **Apply:** https://www.adzuna.co.uk/jobs/details/5948546900

## About the Role

* Strong experience as a backend engineer working on production systems
 * Comfort operating in ambiguous environments with changing priorities
 * A product-minded approach to engineering and problem solving
 * Ability to communicate clearly with engineers, product managers, and teams across the organisation
 * Experience with Java, Kotlin, or similar languages is helpful, but not essential
 * Front-end experience (React) is a strong plus, but not a hard requirement
 * AI Fluency: You have hands-on experience using AI to improve your workflow, and the sound judgment to know exactly when to rely on it and when to step in yourself.

## Description

We're hiring a Senior Software Engineer to join our EO team at Personio. This is a role that sits in a senior, high-trust engineering team working on core platform capabilities that power large parts of the Personio product.

EO sits at the intersection of platform and customer-facing product. The systems built here are used by many other teams across Personio and directly impact how admins manage company structures, permissions, and employment-related data.

This role is primarily back-end focused, with a strong preference for engineers who are comfortable contributing to front-end work when needed (React). You don't need to be a classic full-stack engineer, but you should be happy operating across the stack where it makes sense.

What You'll Be Working On
Over the next 6-12 months, the team will spend most of its time on new customer-facing feature development, with the remaining time focused on modernising and improving existing foundations.

What you'll work on
You'll contribute to a set of initiatives centred on:

 * Evolving core platform capabilities that power how organisations are represented and managed in Personio (data models, APIs, and workflows)
 * Building secure, scalable backend services that support complex permissioning, delegation, and governance needs
 * Improving foundations and system quality (performance, observability, robustness, tech-debt reduction, and operational excellence)
 * Designing for change at scale, including backward-compatible migrations, versioning strategies, and safe rollout patterns
 * Cross-team collaboration with multiple product and platform teams to ensure changes integrate cleanly and scale safely across the ecosystem

What You'll Do

 * Design, build, and evolve scalable backend systems that are used across Personio
 * Work in ambiguous problem spaces, proactively identifying missing information and dependencies
 * Balance product thinking with technical excellence, shaping solutions rather than just executing tickets
 * Collaborate closely with Product and Design, while also managing a wide range of technical stakeholders
 * Contribute to a senior-heavy team through code reviews, design discussions, and technical leadership
 * Occasionally contribute to front-end work where it unblocks delivery or improves outcomes