Sr. iOS Engineer

Harnham; New York (NY); On-site; USD 100,000 - 150,000; Full time

Job summary

Harnham is seeking a talented iOS Engineer to join their growing team in New York. This role involves building a native iOS app from the ground up, focusing on the core customer experience. You will have significant influence over architecture and engineering standards, directly impacting the company's mobile strategy.

The ideal candidate will have a strong computer science background, experience with Swift, and a solid product mindset, ready to contribute to an innovative environment.

Qualifications

• Experience in high-bar engineering organisations with strong product and quality standards.
• Proven iOS development experience (depth can vary).
• Ability to reason about user experience and performance.

Responsibilities

• Own the native iOS application end-to-end across core customer journeys.
• Design and define the iOS app architecture and engineering standards.
• Collaborate with Product and Design to deliver high-quality mobile experiences.

Skills

Strong computer science fundamentals

Hands-on experience with Swift

Strong product mindset

Ability to operate with high ownership

Education

CS degree from a reputable institution

Job description

This is a rare opportunity to join a high‑growth, consumer marketplace business at a pivotal moment and build a native iOS app from the ground up. Mobile is becoming central to the company's next phase of growth, and this role will play a defining part in shaping the product experience, engineering standards, and long‑term mobile strategy.

The organisation has strong product‑market fit, meaningful scale, and clear momentum, but remains lean enough that one exceptional iOS engineer can have outsized impact across architecture, user experience, and technical direction. This is a founding‑level mobile role with real ownership, influence, and visibility.

Responsibilities

• Own the native iOS application end‑to‑end across core customer journeys including search, discovery, booking, account, and post‑booking
• Design and define the iOS app architecture, engineering standards, and quality bar from the ground up
• Partner closely with Product and Design to deliver polished, intuitive, high‑quality mobile experiences
• Collaborate with Backend engineers to shape API contracts that prioritise performance, resilience, and long‑term scalability
• Establish testing strategies, release processes, and observability to ensure reliability and performance at scale
• Drive high standards for craftsmanship, performance, and engineering judgement across mobile
• Influence product direction and help define the long‑term mobile strategy
• Lay the technical foundation for building and scaling an iOS team over time

Must‑Have Qualifications

• Strong computer science fundamentals; CS degree from a reputable institution preferred
• Experience working in high‑bar engineering organisations with strong product and quality standards
• Hands‑on experience with Swift and native iOS development (depth can vary)
• Strong product mindset and ability to reason about user experience, performance, and trade‑offs
• Ability to operate with high ownership in ambiguous, early‑stage or evolving environments