Our Mobile department works alongside with the frontend / backend development teams and the UX team in order to deliver top-notch applications for the end users’ devices. Whether it’s an iOS / Android app or a cross-platform one, we make sure to meet the customer’s expectations, while taking care of the usability and the code quality.
We’re looking for a senior iOS engineer (**3-6 months contract**, potential to extend 1 year+) to help one of our customers build an adaptive daily planning and coaching app designed to help users achieve their goals more consistently. Unlike traditional habit trackers, the app dynamically adjusts daily tasks based on real-life constraints (time, energy, context), helping users avoid the “all-or-nothing” trap and stay consistent. The app is already live on the App Store with early users and is now entering a phase focused on improving stability and performance, expanding the feature set (social, coaching, etc.), and scaling product quality. You’ll work directly with the founder and a small engineering team in a fast-paced startup environment.
EU flexible schedule with PST evening overlap (7-10 AM CET)
Short Bytex HR introductory discussion
1-2h Bytex technical discussion with one of our senior engineers
Technical interview with client (project-based discussion + possible live coding)
Offer presentation
Build and iterate on features using SwiftUI
Improve performance, stability, and responsiveness
Debug and resolve production issues
Enhance testing strategy (unit + UI where relevant)
Improve overall code quality and architecture
Contribute to UI/UX improvements
Integrate with backend APIs and LLM-powered features
Handle async/real-time flows (e.g., streaming responses, edge cases)
Bring light structure and best practices to a currently ad-hoc process
Strong experience with Swift and SwiftUI
Knowledge of Node.js (Express) and PostgreSQL (via Supabase)
Solid understanding of MVVM architecture
Experience building and maintaining production iOS apps
Strong debugging and performance optimization skills
Experience with REST APIs and backend integration
Familiarity with CI/CD pipelines (e.g., GitHub Actions)
Experience with TestFlight and App Store releases
Ability to work independently in a startup environment
Experience with Node.js (Express)/backend development
Experience integrating AI/LLM features into apps
Familiarity with Supabase/PostgreSQL
Experience with analytics, tracking, and user behavior insights
Experience improving test coverage in existing codebases
Prior work on consumer apps/habit, or productivity apps
Able to work in an environment with ad-hoc prioritization (no strict Scrum/Sprints yet)
High ownership and autonomy are expected while working directly with the founder
Ability to work with evolving requirements and ambiguity
We are an East European software development and consulting company that can help your business grow by providing high-quality services.