Software Engineer - Mobile (iOS)

Personio GmbH; City of London; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A leading SaaS company in London is seeking a Senior iOS Engineer to enhance their mobile app, which is used by a significant portion of their clients. You’ll be part of a dynamic team, working on innovative features and collaborating with various stakeholders. The role includes developing native iOS applications and requires strong skills in Swift and API integration. The position promotes a hybrid working model with competitive compensation and benefits, fostering a collaborative and flexible workplace.

Benefits

Competitive compensation

28 days of annual leave

Flexible working environment

Family leave and mental health support

Regular team events

Qualifications

• Strong experience developing native iOS apps in Swift.
• Proven experience shipping production apps with high reliability.
• Strong understanding of mobile architecture and API integration.
• Experience in CI/CD, testing frameworks, and monitoring tools.
• Collaborative mindset in an agile environment.
• Interest in contributing to non-iOS platforms.
• Enjoy mentoring or coaching other engineers.

Responsibilities

• Design, build, and ship native iOS features.
• Drive end-to-end delivery from ideation to release.
• Improve app performance and reliability.
• Collaborate with cross-functional teams.
• Contribute to standards and code reviews.
• Influence product direction with technical insights.

Skills

iOS development in Swift

Production app delivery

Mobile architecture

CI/CD practices

API integration

Cross-functional collaboration

Prototyping skills

Experience with SwiftUI

SaaS or HR tech experience

Job description

Personio's intelligent HR platform helps small and medium-sized organizations unlock the power of people by making complicated, time-consuming tasks simple and efficient. Our growing team of 1,800+ Personios across Europe and the US are building user-friendly products that delight our 15,000+ customers and their 1.5 million employees. Ready to make an impact from day one?

Location: London (2 days per week in the office)
Department: Product & Technology

Join us to shape the future of mobile at Personio, one of Europe’s fastest-growing SaaS companies. You’ll be part of a small, high-impact team building the next generation of Personio’s native iOS app, empowering millions of employees across Europe to manage their work and life seamlessly on the go.

The Role

We’re looking for a Senior iOS Engineer (d/f/m) to take ownership of key parts of Personio’s iOS experience. You’ll join a growing engineering team in London, working closely with Product, Design, and Backend teams to deliver high-quality, native experiences that bring HR tasks directly to our users’ fingertips.

This role requires 2 days per week in our London office.

What You’ll Do

Design, build, and ship native iOS features that enhance how millions of users interact with Personio.

Drive end-to-end delivery from ideation and technical design through implementation, testing, and release.

Improve app performance and reliability, ensuring mobile parity with Personio’s web platform.

Collaborate cross-functionally with product managers, designers, and backend engineers to define mobile-first solutions.

Champion engineering excellence by contributing to standards, code reviews, and continuous improvement of development practices.

Influence product direction by sharing technical insights and helping define what a world-class mobile experience looks like.

What You Need to Succeed

Strong experience developing native iOS apps in Swift

Proven experience shipping production apps with high reliability and performance standards.

Strong understanding of mobile architecture, API integration, and modern app development principles.

A passion for craft and code quality, with experience using CI/CD, testing frameworks, and monitoring tools.

Collaborative mindset, able to partner closely with engineers, designers, and PMs in an agile environment.

Proactive approach to solving problems and improving both the product and the team.

Experience prototyping and experimenting with iOS betas or new iOS features then demonstrating their capabilities / changes with both technical and non-technical people.

Strong experience developing native iOS apps with SwiftUI

Have contributed to cross-platform projects or worked closely with Android teams.

Have an interest in contributing to platforms other than iOS

Have experience in SaaS, HR tech, or other B2B mobile environments.

Enjoy mentoring or coaching other engineers.

Why This Role Matters

Our iOS app is already used by more than 20% of Personio’s customer base, and we’re aiming to double that over the next year. You’ll join at a pivotal moment, helping us redefine what great looks like on mobile as we scale to millions of active users.

You’ll work in a highly collaborative, mission-driven environment where autonomy and ownership are encouraged, and your work will directly shape Personio’s mobile strategy for the future.

Why Personio

At Personio, we believe in hybrid working that balances flexibility with in-person collaboration. This role is office-based, with 2 days per week required in our London office.

You’ll also enjoy:

Competitive compensation, including salary, benefits, and pre-IPO equity.

28 days of annual leave, plus an extra day after 2 and 4 years of service.

1 fully paid Impact Day per year to make a difference in your community.

Comprehensive family leave, mental health support, and sabbatical options.

Flexible working environment, including 20 annual “Flex Days” to work from anywhere in Europe.

Regular team events, catered lunches, and a culture built on trust, curiosity, and ownership.