Senior MacOS Developer (6-week project, freelance)

We’re currently seeking a passionate freelance Senior macOS Engineer to join our upcoming (22nd of September) project (wearable medical device).

As a freelancer cooperating with intent, you'll have the chance to work on innovative macOS and IoT-related applications, contributing your expertise to our team. At the moment, there are no ongoing projects, but we eagerly await new opportunities and are keen to engage with talented engineers specialising in native Mac apps.

intent has over 10+ years of experience in helping to conceptualize, design, and build apps for IoT and connected devices. We're a software house that acts as a specialized think partner for products at the intersection of physical and digital (like wearables and IoT) – from net-new to products looking to enter a competitive and established niche. Some of our clients include Oura, BOSE, and McIntosh audio systems.

💰 Salary: 150-210K PLN net hourly on B2B, depending on your experience

⌚️ Start date and engagement: 22nd of September 2025, 6-week engagement (8 hours a day with flexible working hours)

🏝️ Perks and benefits: 100% remote work, flexible working hours, and knowledge-sharing initiatives. Moreover, if after a few months of working together, we're all on the same page, we’ll gladly invite you to join our internal intent team for long-term collaboration, and you’ll enjoy all the benefits, such as paid holidays, paid sick leave, training budget, and much more!

What you’ll do

• Build native Mac applications using Swift 6, SwiftUI, and CoreData.

• Debug and profile apps with Instruments and LLDB to ensure top performance.

• Design, develop, and maintain a macOS application that integrates with third-party libraries for sensor data handling.

• Implement efficient ingestion and parsing of diverse raw sensor readouts transmitted over local Wi-Fi.

• Develop data normalization, validation, and error-handling routines to ensure reliable processing.

• Collaborate with hardware and backend teams to align data formats, protocols, and performance requirements.

  
  

Requirements

• Advanced knowledge of Swift 6, SwiftUI, and CoreData.

• Experience debugging and profiling with Instruments and LLDB.

• Proven track record of building native macOS applications

• Experience integrating third-party libraries for data or sensor handling.

• Working knowledge of data parsing and normalization (especially sensor data over Wi-Fi).

• English min. B2 (both written and spoken.

• Engagement and team play.

• Scrum (or other Agile) development method experience.

Tools you’ll use

• Jira, Confluence

• Slack, Zoom, GSuite

Recruitment process

1. A screening call with an HR person  (45 mins)

2. A technical interview (60–90 mins)

3. Final feedback received within a week after the interview