Senior iOS Developer (Mobile App Development)

We’re looking for a Senior iOS Developer to join the Esti team and take ownership of features end-to-end – from clarifying requirements with Product, Design, and Analytics to designing the technical solution, estimating and breaking down tasks, implementation, stabilization, and release.

Esti (https://esti.app/) is our mobile product for creators and bloggers, focused on helping users create and edit engaging visual content. It’s part of our product ecosystem alongside our main app, Prequel (https://prequel.app/), a mobile photo and video editor.

You’ll work on a product with complex client-side logic, monetization, dynamic and remotely configurable experiences, and AI-powered workflows.

Responsibilities

• Own product tasks end-to-end: clarify requirements, design technical solutions, decompose and estimate work, implement, stabilize, and release;
• Improve the core user flow – from app launch to the first successful edit;
• Work on monetization features, including subscriptions and in-app currency;
• Develop and improve editor features and user experiences;
• Build dynamic and remotely configurable screens and business logic;
• Take an active part in improving development and testing processes and engineering practices;
• Participate in code reviews and mentor other iOS developers;
• Contribute to the overall technical expertise and evolution of the iOS team.
  
  

Tech Stack

• Swift 6
• SwiftUI + UIKit – both are required
• Structured Concurrency
• StoreKit 2
• AI coding agents – Claude, Cursor
• Proxyman / Charles

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• Firebase Remote Config
• Xcode Instruments
  
  

How We Hire

• HR interview
• Tech interview
• Final interview with CTO
• Reference check
  
  

Requirements

• 4+ years of commercial iOS development with Swift;
• Experience working with large codebases and modular architectures;
• Experience in product teams and ownership of features from idea to release;
• Strong experience with both SwiftUI and UIKit;
• Solid understanding and practical experience with Structured Concurrency and StoreKit 2;
• Advanced, hands-on experience with AI coding agents such as Claude and Cursor;
• Experience creating skills, documentation, and workflows for AI agents;
• Regular use of AI agents for day-to-day engineering tasks and problem solving;
• Experience with third-party MCPs to improve development workflows;

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• Ability to work independently, make technical decisions, and take ownership of outcomes;
• Comfortable working with ambiguity and changing priorities;
• Curiosity and a strong desire to improve both the product and the way the team works.
  
  

Nice To Have

• Experience with Photos / PhotoKit and AVFoundation.
• Experience with unit and UI testing.
• Experience working on apps with complex business logic on the client side.
• Experience solving non-standard or technically challenging problems.
• Personal interest in photo/video editing, content creation, blogging, or similar areas.
  
  

Conditions

• Professional development – paid training and courses, as well as online and offline lectures, workshops, and training sessions. Our employees take part in all major IT meetups;
• Adaptation – a high-quality onboarding process that helps new employees settle in quickly and smoothly. We regularly collect feedback throughout the probation period;
• Career development – performance reviews are conducted every 6 months. We monitor progress and help employees improve their performance;
• Work-life balance – the flexibility to build your work schedule conveniently, as well as take vacations and days off without unnecessary approvals or bureaucracy;
• Health – health insurance compensation.
• Office – a modern office in Montenegro with comfortable workspaces and lounge areas;
• Relocation – we provide a full relocation support package for those moving to Montenegro, including assistance with obtaining a residence permit;
• Prequel+ – premium access to the full Prequel product suite.