Senior iOS Developer

Prequel https://prequel.app/ is our flagship – millions of users, trendy filters and effects. But we’ve got a whole other world beyond it: GIO (https://gioapp.ai/) and Hula, our two gen-AI apps that are redefining how people create visual content.

We’ve rebuilt our day-to-day around AI coding agents – they’re in the loop for planning, scaffolding, refactoring, and debugging. We’re looking for a senior iOS engineer who works the same way: with established habits for directing agents and verifying their output, not someone who occasionally uses Copilot for autocomplete. At the same time, AI doesn’t replace iOS fundamentals – in our domain (Auto Layout edge cases, Swift Concurrency, AVFoundation, Core Image, memory under image/video load) models still hallucinate APIs and miss threading bugs, and we need someone who can catch that.

Why you’ll like it here

• Codebase: It’s been around for 3-5 years. Some parts are modern, some are older and need refactoring. We spend time both building new features and rewriting legacy code.

• Impact: The team is small. Your opinion on product features and technical decisions actually gets heard. If you see something that can be improved, you can push for it.

• Ownership: We need someone proactive who can take a feature from idea to release and handle the post-release support.

• AI tools: Part of our everyday workflow. We invest in agent setup and share what works internally.

Responsibilities

As a key member of the product team, you’ll own the full development cycle:

• Build and ship new user-facing features.

• Direct AI agents through the full development loop — from spec to PR-ready diff — and own everything you ship, including catching hallucinated APIs and brittle abstractions before they land.

• Codify team conventions into agent-readable artifacts (rules files, specs, ADRs) so the team scales — not just your individual output.

• Conduct thorough code reviews — of your own code, your teammates’, and your agents’ — and maintain clear documentation.

• Participate in decomposition and estimation of tasks.

• Work on improving app’s structure and refactoring legacy code (Swift).

• Handle post-release support and iterate based on feedback.

Requirements

• 4+ years of experience in commercial iOS development, with time spent in product teams.

• Experience working on large-scale applications with a significant codebase.

• A mindset of writing clean, maintainable, and testable code.

• Daily, established workflow with AI coding agents (Cursor, Claude Code, Codex, or similar) — you can describe your workflow, your prompting habits, and where you’ve learned to push back on agent output.

• Comfortable with prompt decomposition, context engineering, and managing context windows in large codebases — you have a deliberate workflow, not ad-hoc prompting.

How we hire:

• HR interview

• Tech interview (~2h): live build session with your AI stack of choice + code review without AI. We share the format and evaluation criteria in advance.

• Final interview with CTO

• Reference check

Conditions

• Professional development – paid training and courses, online / offline lectures, workshops and trainings. Our employees take part in all major IT meetups;

• Adaptation – qualitative onboarding, we help to quickly and smoothly solve all problems. regularly collect feedback throughout the trial period;

• Career development – Review is conducted every 6 months, we monitor results and help improve performance;

• Balance between work and personal life – ability to conveniently build your work schedule, take vacations and days off without a bunch of approvals and bureaucracy;

• Health – extended voluntary health insurance (on the territory of Montenegro);

• Office space – a cool office in Montenegro, with comfortable workplaces and lounge areas;

• Relocation – we offer a full package of documents for those who are ready to move to Montenegro, and we help with obtaining a residence permit;

• Prequel+ – premium access to the entire Prequel product.