Frontend Engineer

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Koinly

WebsiteLinkedInAll Job Openings

11 - 50 employees

Founded 2019

₿ Crypto

💳 Fintech

☁️ SaaS

Crypto • Fintech • SaaS

Koinly is a company that provides cryptocurrency tax calculation and asset tracking software to help investors and accountants calculate and file crypto taxes quickly and accurately. The platform connects to exchanges and wallets, automates tax-report generation, and aims to simplify tax compliance and portfolio tracking for users worldwide. Koinly operates as a remote-first, fast-growing startup focused on making crypto tax reporting accessible and efficient.

📋 Description

• Own frontend features end-to-end for a high-performance experience with complex crypto tax data • Optimize, refactor, and elevate the existing frontend codebase • Deliver critical new features for a high-performance interface handling massive datasets and complex DeFi reconciliations • Work across a modern React web application and a distributed data-processing backend • Expand scope to a React Native mobile app in the future • Write high-quality code and make sound architectural decisions • Lead by example and raise the bar for the frontend team • Work closely with Product and Design as the primary frontend partner for Product • Evaluate ideas technically and propose creative solutions • Own frontend strategy and product outcomes • Ensure reliable cross-browser behavior and pixel-level visual precision

🎯 Requirements

• 8+ years of experience with a focus on complex, data-heavy web applications • Deep understanding of modern, complex web application architecture and scalable design patterns • Strong attention to detail and advanced frontend styling skills • Reliable cross-browser behavior and pixel-level precision • Fluency with AI development tools such as Claude, Codex, and Cursor • Expert-level TypeScript • Deep React experience, including React internals, performance optimization, and modern tooling • Production-level experience with React 19 and React Compiler • Strict, modern TypeScript • Experience with TanStack Router, Query, and Table • Experience with Radix UI and Mantine • Experience with Tailwind CSS v4, class-variance-authority, and tailwind-merge • Experience with Vite, Vitest, Playwright, Storybook, and Chromatic • Experience with Highcharts and Sentry • Experience with Bun, oxlint, and Biome • Experience with csv-parse, xlsx/SheetJS, and node-html-parser • Experience with blockchain libraries, RabbitMQ, and Redis/ioredis • Experience with PostgreSQL, Heroku, GitHub, and JIRA • Must be located in Europe / EU or UK timezones; applications from outside Europe will not be reviewed • Background check required before joining • Nice to have: React Native mobile application experience • Nice to have: Public GitHub or similar project portfolio • Nice to have: Financial products background • Nice to have: Blockchain and crypto technology experience • Nice to have: Ruby familiarity • Nice to have: Understanding of DeFi protocols and on-chain operation • Nice to have: Knowledge of the Koinly product

🏖️ Benefits

• 32 days PTO (incl. public holidays) • Remote-first and async-first work environment • Long blocks of deep work time • Autonomy to make architectural decisions • Direct impact on a product used by hundreds of thousands of investors • Background checks required before joining