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Application Developer -Freelancer (Remote)

Twine
Department:Web Design
Type:REMOTE
Region:EU
Location:European Economic Area
Experience:Mid-Senior level
Estimated Salary:€60,000 - €90,000
Skills:
IOSSWIFTSWIFTUIAIMLMOBILECLOUDAPIDATA SECURITY
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Job Description

Posted on: October 24, 2025

This role involves developing an innovative iOS application designed to serve as an AI-driven mental performance coach for athletes and high performers. The app will guide users through evidence-based techniques and exercises to enhance mental resilience, focus, and overall performance. The project is at the MVP stage, with the goal of launching a robust, user-friendly product that leverages AI/ML to deliver personalized coaching experiences. This opportunity is ideal for a developer passionate about sports technology, mental health, and AI, with the potential for ongoing collaboration as the product evolves. Deliverables

  • Design and develop an MVP iOS application for mental performance coaching
  • Integrate AI/ML models to deliver personalized mental training exercises and feedback
  • Implement user onboarding, progress tracking, and interactive coaching modules
  • Ensure a seamless, intuitive user experience with a clean UI/UX
  • Collaborate on feature ideation and technical architecture for scalability
  • Conduct testing, debugging, and optimization for app performance and reliability
  • Prepare technical documentation and handoff materials for future development

Requirements

  • Proven experience in iOS app development (Swift/SwiftUI preferred)
  • Strong background in AI/ML integration within mobile or web applications
  • Familiarity with mental health, sports tech, or performance coaching apps is a plus
  • Ability to design and implement scalable, maintainable codebases
  • Experience with cloud services, APIs, and data security best practices
  • Excellent problem-solving skills and attention to detail
  • Strong communication skills and ability to work independently
  • Availability for ongoing collaboration and potential follow-up work
  • Based in any location; remote work is acceptable

About Twine Twine is a leading freelance marketplace connecting top freelancers, consultants, and contractors with companies needing creative and tech expertise. Trusted by Fortune 500 companies and innovative startups alike, Twine enables companies to scale their teams globally. Our Mission Twine's mission is to empower creators and businesses to thrive in an AI-driven, freelance-first world.

Originally posted on LinkedIn

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