We're ASOS. We blend our flair for fashion with our love of cutting- edge technology, but more importantly were interested in how we can bring the best out of you.
We exist to give people the confidence to be whoever they want to be, and that goes for our people too. At ASOS, you're free to be your true self without judgment, and channel your creativity into a platform used by millions.
Job DescriptionWe're looking for a Mid-level iOS Engineer to join our Analytics & Experimentation Product Delivery Team and own how customer behavior is captured in our iPhone and iPad apps. This role is about building reliable, well‑governed analytics and experimentation instrumentation at scale, and working collaboratively with product and engineering teams across ASOS to make the data they depend on trustworthy. Our app is used by over 8 million active users globally, maintains an excellent App Store rating, and is built using modern iOS technologies including the latest versions of Swift. You'll be contributing to a mature, well‑supported platform where quality, reliability and user experience matter — and you'll be the iOS voice in a team that spans web, Android, back-end and analytics engineering. What you'll be doing:
- Implementing and maintaining analytics event tracking in the iOS app following iOS best practices and platform guidelines
- Working closely with product managers, analysts and data engineers to translate event specs into instrumentation, and making sure iOS events conform to the agreed schemas, naming conventions and data contracts
- Collaborating within an agile, cross‑functional team, and supporting other ASOS iOS teams who contribute tracking through our inner source model — reviewing pull requests and helping them validate their events
- Investigating and resolving data quality issues, such as discrepancies between platforms or missing and incorrectly populated properties, and taking ownership through to a permanent fix
- Supporting experimentation on iOS, including Optimizely SDK integration, experiment exposure and variant events, and the operational monitoring behind them
- Supporting code quality, maintainability and testing so that tracking changes ship safely and behavioral data stays reliable
About you
- Experience building iOS applications using Swift and the core iOS frameworks
- Experience integrating third‑party SDKs into a production iOS app analytics, experimentation or similar (e.g. Mixpanel, Optimizely) or a strong appetite to pick this up
- An understanding of how mobile events are batched, queued and flushed, and the trade‑offs between data completeness, battery and network performance
- Knowledge of common software design patterns and architecture concepts, and an interest in designing instrumentation that's consistent and easy for other teams to adopt
- An interest in writing clear, maintainable code and improving existing codebases
- Awareness of privacy and consent requirements and how they apply to customer tracking on mobile
- Comfortable debugging data problems as well as code inspecting payloads, comparing against expected output, and working with analysts to confirm a fix (SQL or Databricks familiarity is a bonus, not a must)
- Familiarity with unit testing and a willingness to contribute to test coverage
- Experience with UI automation tools
What's in it for you?
- Competitive salary, pension, and private medical care scheme
- Performance related bonus
- Flex benefits allowance - which you can chose to take as extra cash, or use towards other benefits
- 25 days paid annual leave + an extra day for your birthday
- Employee discount (hello ASOS discount!)
- Tech Develops - our internal tech focussed skills development programme to focus on your personal growth as a technologist
- Opportunity to represent ASOS at industry leading events
- Opportunity to help shape and drive our DE&I initiatives in Tech (like our WIT movement and Diversity mentoring in Tech)
- Opportunity to make an impact from day one and work with the latest in cutting edge of technology
Skills Required
- Experience building iOS applications using Swift and core iOS frameworks
- Experience integrating third-party SDKs into production iOS apps (analytics/experimentation)
- Understanding of mobile event batching, queuing, flushing and trade-offs for performance and battery
- Knowledge of common software design patterns and architecture for instrumentation
- Interest in writing clear, maintainable code and improving existing codebases
- Awareness of privacy and consent requirements as they apply to mobile tracking
- Comfortable debugging data issues and inspecting payloads; work with analysts to confirm fixes
- Familiarity with SQL or Databricks (bonus)
- Familiarity with unit testing and contributing to test coverage
- Experience with UI automation tools
ASOS Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about ASOS and has not been reviewed or approved by ASOS.
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Wellbeing & Lifestyle Benefits — Feedback suggests perks like a sizable, shareable product discount, access to sample sales, free gym access, and on-site amenities are valued. Such lifestyle-oriented benefits are frequently highlighted as standout aspects of the package.
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Leave & Time Off Breadth — Feedback suggests employees benefit from substantial annual leave with bank holidays and an extra celebratory or birthday day off, with summer early finishes referenced in some contexts. This breadth of time-off options supports work-life balance.
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Healthcare Strength — Feedback suggests access to a private medical care scheme is a core part of the package. This contributes to a perception of strong healthcare support.
ASOS Insights
What We Do
We exist to give people the confidence to be whoever they want to be, and that goes for our people too. At ASOS, you’re free to be your true self without judgment, and channel your creativity into a platform used by millions. Whatever your role, asos will encourage you to be you, fulfilling your creative potential with our global reach. Push boundaries, and challenge expectations. We’re determined to succeed, so we’ll trust you to deliver. Help drive our journey to becoming the global fashion destination for 20-somethings At ASOS our 3,000+ employees are immersed in the creative worlds and have a truly entrepreneurial attitude. Our ASOSers are authentic, brave, creative and disciplined to the core and find ways to blend our passion for fashion with cutting edge technology. Sound up your street? Join us.
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