Koinly simplifies crypto taxes for millions of users. Our cryptocurrency tax platform transforms billions of blockchain transactions into accurate financial records through reliable, high-performance engineering.
We're hiring a Staff Software Engineer to join our Engineering team. The mission of this role is to strengthen our Ruby systems by simplifying complexity, improving performance, and shaping the architecture that keeps financial data precise and fast.
Koinly is a remote-first and async by design, with strong product-market fit in a niche (and booming) domain: crypto taxes.If you thrive on deep technical work and value autonomy, clarity, and craft, you’ll fit right in.
→ Apply below to help build the backbone of large-scale financial systems.
📍Location: Remote - preference for Europe-based candidates.
💰 Salary: USD $100K-115k / year.
📜 Contract type: Full-time (B2B contractor).
🌴 Perks:
💼 Experience level: 7+ years.
🗓️ Start date: ASAP.
👥 Team size: 10 person engineering team.
🔧 Main responsibility: Engineer and optimize high-performance Ruby systems that handle billions of financial transactions, solving deep scaling, data, and code-quality challenges.
As Koinly scales, we need our backend systems to stay fast, reliable, and accurate. This Staff Engineer will provide hands-on technical excellence to optimize reliability and simplify complex pipelines as we scale to billions of transactions.
As a Staff Engineer at Koinly, you’ll stay deeply hands-on while anchoring complex projects, guiding technical direction, and sharing knowledge that raises the bar for the whole team. We value engineers who think independently, stay curious, and communicate with clarity. Collaboration here means solving hard problems together, giving direct feedback, and continuously improving how we build at scale.
⚙️ Craftsmanship matters: we value deep thinking, well-structured systems, and clean code.
💬 Async-first collaboration: clarity and autonomy come through written communication.
🚀 Impact through ownership: engineers drive projects end to end.
🌍 Remote: we trust people to work flexibly and deliver excellence from anywhere.
🏗 Built for builders: A profitable, bootstrapped startup in a hyper-growth industry.
💎 Pure Ruby backend: No language sprawl or over-engineering.
ð§ Autonomy-first: Async communication, deep work, minimal meetings.
ð Massive scale: Billions of trades and 950+ integrations.
ð¥ Small team, big impact: Millions of users, ~37 people company-wide.
𪶠No corporate theatre: Zero bureaucracy, high trust, high ownership.
ð° Flexible by default: Fully remote, async, and results-oriented.
𧩠Crypto-adjacent without the hype: Weâre a painkiller, not a multivitamin.
Join Koinly and design systems of crypto tax at massive scale. Apply today!
Due to the nature of our business and external requirements, we perform background checks on all potential team members, passing which is a prerequisite to join Koinly.
Koinly is a tax solution for cryptocurrency investors and accountants. Anyone who owns multiple exchange accounts or wallets knows the pains when it comes to declaring taxes. Koinly was built to solve this very problem - by integrating with all major blockchains and exchanges such as Coinbase, Binance, Bittrex and CEX.io, Koinly reduces crypto tax reporting to a few minutes of work. Simply connect your exchange accounts / public addresses and let Koinly figure out your capital gains. Your final tax report is presented in a format that is accepted by your tax agency, making it easy to print & file. Alternatively, import our report into a tax filing software like TurboTax, TaxACT or Xero.
We currently support 100+ countries, including the USA, UK, Canada, Australia, Sweden, Norway, Ireland and many more - see our website for the full list.
