frontend developer for mobile subscription products

Adapty provides mobile apps with tools to manage in-app purchases and paywalls. Its platform powers over 20K apps, processes more than $2B in subscriptions annually, and helps customers grow subscription revenue through products such as Flow Builder, analytics, SDKs, and AI-powered tools.

• Take features from customer problems to production by deciding what to build with product and design, shipping it, and evaluating post-release changes;
• Own the editor architecture, including module boundaries, the document model, reusable components, and performance at scale;
• Ship features across the editor surface, including the canvas, layers, element inspector, selectable groups and states, navigation, actions, variables, and conditional logic;
• Own the layer translating editor configuration into SDK execution across five runtimes and negotiate the contract with the mobile team;
• Close the gap between browser preview and device rendering across layout, typography, media, dark mode, screen sizes, and orientations;
• Build the document model with nested configurations, undo and redo, autosave, drafts and published versions, and concurrent editing;
• Build AI Editor functionality with prompt history, per-prompt undo, and clear change inspection.

• 5+ Years of experience shipping production web applications with React and TypeScript;
• Experience building editor-class interfaces such as canvases, drag-and-drop systems, node or graph editors, WYSIWYG tools, design tools, or page builders;
• Product thinking with the ability to explain the problem a feature solved, who had it, and what changed after release;
• Experience owning architecture on a growing product and explaining architectural boundaries and trade-offs;
• Strong knowledge of complex client state, including normalized models, immutability, undo and redo, optimistic updates, and versioning;
• Ability to own rendering and performance end to end, including the box model, flex, absolute positioning, pixel-accurate reproduction, and profiling before optimization;
• Ability to identify requirements and contracts independently and openly challenge incorrect decisions.

• Flexible remote work from anywhere or onsite work in Belgrade or London;
• Exceptional compensation directly tied to results;
• Language learning support, sports benefits, health insurance, and laptop coverage;
• Direct communication, ownership, and a low-bureaucracy environment;
• Adapty is among the top 5% fastest-growing SaaS companies.