Tech Lead
Koinly
- Work style
- remote
- Job type
- full-time
- Experience
- lead
At Koinly, we’re looking for a Tech Lead (Ruby on Rails) to push our financial data platform to the next level. This role is roughly 80% coding, 20% technical leadership and is ideal for a senior engineer who thrives on solving performance bottlenecks, guiding peers, and shaping architecture without the management overload.
More about us is included at the end of this page.
🔑 Key details
Report to: Engineering Manager
Squad: Core
Team size: 5 senior engineers (within a 10-person backend group)
Location: Remote, preference for Europe-based candidates
Salary: USD $100k–120k / year
Type: Full-time (B2B contractor)
Experience: 7+ years, prior leadership of senior peers
Start date: ASAP
Mission: Lead a small senior team while staying hands-on to solve performance bottlenecks and push technical excellence.
🚀 The challenge ahead
Koinly’s backend reconciles billions of crypto transactions across 900+ integrations. Every millisecond and data point must be accurate. As usage surges, the challenge is keeping our systems fast, reliable, and easy to evolve.
You’ll lead the effort to:
Keep performance high as scale increases.
Refactor and simplify complex Ruby systems.
Mentor senior peers and shape the next generation of our backend architecture.
Clean code and clarity at massive scale, that’s the mission.
🛠️ What you’ll do
Performance and reliability
Profile, tune, and reduce latency across high-volume ingestion and reconciliation systems.
Optimize Postgres queries, caching, and background processing.
Architecture and refactoring
Own and evolve our Ruby + Postgres backend.
Lead major refactors to improve maintainability and scalability.
Design data flows and pipelines that reconcile billions of records accurately.
Technical leadership
Set coding standards, review designs and pull requests, and coach senior engineers through code review.
Leadership through mentoring, reviews, and technical decision-making (without management overhead).
Collaboration
Collaborate asynchronously with product, design, and leadership.
We're light on meetings, heavy on ownership.
Collaborate through lightweight RFCs and clear written communication
What success looks like?
You’ll make our systems faster, our codebase simpler, and our engineering culture stronger.
7+ years’ experience and deep proficiency in Ruby on Rails.
Proven results improving performance and reliability in production databases (Postgres preferred).
Strong async communication and mentoring skills.
Track record of solving performance issues through thoughtful design and clean code.
Ability to analyze and simplify complex systems.
Experience with data pipelines, ETL, or reconciliation systems.
⚙️ Koinly engineering culture
Engineering-led values: Maintainability, test coverage, and reliability come before shipping speed
Craftsmanship mindset: We care deeply about clean, readable code that scales gracefully
No heroics: Systems are built to be stable, observable, and easy to debug.
Autonomy & accountability: Small squads, high ownership, minimal bureaucracy.
Async-first & remote-first: We collaborate primarily through clear writing, not constant meetings
This role is no longer accepting applications.