Frontend Staff Engineer, Koinly

• Experience: 8+ years with a focus on complex, data-heavy web applications
• We're looking for someone who thrives on complex, business-critical financial web applications - systems with real architectural depth and high stakes
• You’ll focus on optimizing, refactoring, and elevating our existing codebase while steadily delivering critical new features for a high-performance interface that handles massive datasets and complex DeFi reconciliations
• Above all, we value a high sense of product ownership, exceptional code quality, autonomy, and openness: you take responsibility for outcomes, not just tasks, and you work independently while staying transparent and collaborative
• Deep understanding of modern, complex web application architecture and the design patterns that support it at scale
• Work closely with product and design, serving as the primary frontend partner for Product. You’ll evaluate ideas from a technical perspective, propose creative solutions, and take real ownership of our frontend strategy
• Strong attention to detail and advanced frontend styling skills, including reliable cross-browser behavior and pixel-level precision
• Fluency with the latest AI development tools such as Claude/Codex/Cursor, and the judgment to use them effectively in a professional workflow
• If you don’t meet every single listed criterion, please do still apply—we’d love to hear from you
• Expert-level TypeScript. You should reach for strong typing instinctively, not as an afterthought. We deal with complex financial data where "mostly correct" isn't good enough; your TS skills should reflect that
• Deep React experience. This is a Staff level role. You should have a deep understanding of React’s internals, performance optimization, and modern tooling. We need someone who can hit the ground running with a complex, established codebase

Desirable

• We're looking for a Frontend Staff Engineer to take deep ownership of our data platform - the engine behind products at the intersection of crypto, finance, and tax
• You'll work across a modern React web application and a high-performance distributed data-processing backend, with a new React Native mobile app joining your scope in the future
• This is a senior, hands-on role for someone who combines exceptional engineering craft with genuine product ownership
• We expect you to lead by example: writing high-quality code, making sound architectural decisions, and raising the bar for the entire frontend team
• We’re a remote-first, async-first startup with deep product-market fit
• If you value autonomy, technical excellence, and clear communication over meetings and process complexity, Koinly is the place for you
• Mission: Own frontend features end-to-end ensuring a high-performance experience for complex crypto tax data