Staff Software Engineer

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.

What you'll do :

• Design and develop scalable backend systems that process billions of financial transactions.
• Provide technical direction across projects and collaborate with product and engineering leads to define priorities and architecture.
• Own project delivery : from design and implementation to performance and reliability in production.
• Refactor and modernize core Ruby systems to improve maintainability, readability, and speed.
• Mentor other engineers through technical reviews, design discussions, and clear documentation.

• 7+ years of backend experience with Ruby on Rails at scale, with at least 2 years as a senior engineer, influencing cross-team initiatives.

• Proven record improving system performance and code quality.

• Strong understanding of data flows and software design principles.

• Experience working cross-functionally in async, remote environments.

• Clear communication and ownership mindset. Bonus :

• Experience tuning Postgres in production.

• Built or optimized data ingestion or reconciliation pipelines.

• Open-source contributions to Ruby, Rails, or performance tooling.

• Background in fintech, taxtech, open banking, or blockchain systems.

️ 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. Why join Koinly Built for builders : A profitable, bootstrapped startup in a hyper-growth industry. Pure Ruby backend : No language sprawl or over-engineering. Autonomy-first : Async communication, deep work, minimal meetings. Massive scale : Billions of trades and 950+ integrations. Small team, big impact : Millions of users, ~37 people company-wide. No corporate theatre : Zero bureaucracy, high trust, high ownership. Flexible by default : Fully remote, async, and results-oriented. Crypto-adjacent without the hype : We're a painkiller, not a multivitamin. Join Koinly and design systemsof 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. #J-18808-Ljbffr