Glomopay Frontend Interview Prep

Read my intro — background, experience, and what I've worked on.

Company Context

Glomopay is a fintech company building payment, investment, and KYC products. The role involves building checkout SDKs, merchant dashboards, and internal admin tools.

What HR Shared for Coding Round

1. Fluent with React + TypeScript
2. Clear idea for state management
3. Unit tests
4. SOLID principles

Tech Stack They Use

• React 19, Next.js, TypeScript
• State: Redux / Zustand / TanStack Query
• Styling: Tailwind CSS
• Testing: Jest (unit), Playwright/Cypress (E2E)
• Performance: Lighthouse, Core Web Vitals

Prep Notes (in notes/)

#	File	Topic
1	01-react-typescript.md	React + TypeScript patterns
2	02-state-management.md	State management trade-offs
3	03-solid-principles.md	SOLID principles in React
4	04-unit-testing.md	Unit testing patterns
5	05-performance.md	Performance optimization
6	06-system-design.md	Frontend system design (checkout SDK, dashboards)
7	07-behavioral-talking-points.md	What they value + how to frame answers

General Frontend Concepts

88 advanced frontend concepts are in a separate directory (not Glomopay-specific): Frontend Concepts — see its own index for the full list.

Practice Project (in practice-checkout/)

A mini checkout flow that exercises all four coding round areas:

• React + TypeScript component composition
• State management with Context + useReducer
• Unit tests with Jest + React Testing Library
• SOLID architecture throughout

Quick Revision Checklist

• [ ] Can I explain discriminated unions and when to use them?
• [ ] Can I pick a state management tool and justify the trade-offs?
• [ ] Can I separate server state from client state?
• [ ] Can I name all 5 SOLID principles and show React examples?
• [ ] Can I write a test that tests behavior, not implementation?
• [ ] Can I explain Core Web Vitals (LCP, FID/INP, CLS)?
• [ ] Can I explain code splitting and lazy loading?
• [ ] Can I design a checkout SDK architecture?