[Hiring] Backend Staff Engineer @Koinly

Role Description

We're looking for a Backend Staff Engineer to take deep ownership of our data platform - the engine behind products at the intersection of crypto, finance, and tax. You'll own a high-performance, distributed data-processing backend written in modern TypeScript - the system that ingests, normalizes, and reconciles on-chain and exchange data at scale, and turns it into numbers people file taxes with. Correctness is not negotiable here: a wrong balance is a wrong tax return.

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 backend 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.

Qualifications

• 8+ years with a focus on complex, data-heavy distributed systems.
• Deep understanding of distributed system architecture and the design patterns that support it at scale.
• Real, production-level DeFi experience - AMMs, lending, staking, LP positions, and bridges.
• Advanced data modeling and SQL skills, with a track record of tuning performance on massive PostgreSQL datasets.
• Proven professional experience with Rust.
• Fluency with the latest AI development tools such as Claude/Codex/Cursor.

Requirements

• Own the distributed backend data engine end-to-end, guaranteeing precision, performance, and scale for complex crypto tax data.
• Work closely with product and engineering leads, serving as a key technical partner.
• Focus on optimizing, refactoring, and elevating our backend architecture.
• Ensure deterministic execution, high availability, and financial-grade correctness.

Benefits

• Compensation: USD $80k – $120k/y.
• 32 days PTO (incl. public holidays).

Company Description

Koinly is a successful product used by crypto investors around the world, helping them make sense of complex portfolios and tax obligations across chains, wallets, exchanges, and DeFi protocols.

We aren't just building a calculator; we're building a platform that empowers crypto investors to make the best decisions for their financial future.