Job Description

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 (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 (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
• 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.

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.

Benefits:

• 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.

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