Senior iOS Developer

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. 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 Firebase Remote Config Xcode Instruments How we hire: HR interview Tech interview Final interview with CTO Reference check 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; 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. Required languages: English, Russian. 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. 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.