Senior Ruby Engineer, Koinly
Remote & Asynchronous
$80-90k
Tax management platform for cryptocurrency traders
Open for applications
Tax management platform for cryptocurrency traders
21-100 employees
Open for applications
$80-90k
21-100 employees
Company mission
To provide a secure and compliant cryptocurrency tax solution, giving peace of mind and confidence in tax reporting.
Role
Who you are
- 6+ years of professional Ruby experience
- Strong SQL skills, including performance tuning and complex queries
- Strong problem-solving and debugging skills
- Experience designing and scaling backend systems (microservices, APIs, background jobs)
- Eagerness to work with a high-standard engineering team, CI/CD, and testing
- A track record of taking full ownership of complex features or systems
- Clear, concise written and verbal communication in English
- Comfort with feedback loops and a high-ownership mindset
Desirable
- Experience with high-volume CSV/data ingestion pipelines
- Familiarity with performance profiling tools in Ruby
- Background in DeFi, blockchain, or fintech
- Side projects that show your love for technical puzzles
What the job involves
- We need an engineer who thinks in data pipelines, indexes, and execution plans, not just models and controllers
- Someone who gets irrationally motivated by shaving milliseconds off a query, or turning an hour-long CSV import into minutes
- We’re a fully remote-first, async-first startup with product-market fit in a niche (and booming) domain: crypto taxes
- If you value autonomy, technical excellence, and clear communication over meetings and process complexity, Koinly is the place for you
- Data architecture: Making billions of rows and massive CSVs play nicely with high-throughput APIs
- Performance optimization: Query tuning, caching strategies, background job orchestration
- System design: Scaling Ruby microservices that process terabytes of data without falling over
- Own backend services end-to-end — design, build, refactor, and optimize
- Work with huge datasets (billions of transactions) and make them fast, reliable, and cost-efficient
- Debug gnarly production issues that live at the intersection of code, data, and infrastructure
- Write clean, tested, maintainable Ruby that holds up under scale
- Champion performance, clarity, and simplicity in code and system design
- Occasionally take part in on-call rotation (we have very few prod issues — high coverage and careful releases are the norm here)
- Stay up-to-date with emerging technologies and best practices in Ruby development
- Reporting to: Tech Lead
- Contract type: Full-time (Contractor - B2B)
Application process
- Start date: ASAP
Our take
Trading cryptocurrencies has become a lucrative profession for many investors, but one that is difficult to remain compliant within. The nature of the assets leads to constant price fluctuations and trading of many cryptocurrencies spread across multiple wallets, and its decentralised nature makes this activity difficult to track and analyse for tax calculations.
Koinly provides a tax management platform for cryptocurrency traders, allowing users to import cryptocurrency transaction records directly from ledgers, and aggregate it all into a tax report. The platform also helps users to track their portfolios, ROI, and capital gains within a minimalist dashboard, helping them to identify how to reduce taxes for the next year.
Many different cryptocurrency platforms aim to help traders analyse markets and make smart investment decisions, but the complications of tax reporting for crypto remain untackled. Koinly has recognised this gap in the market, claiming that its platform helps reduce the amount of time and money it takes to produce a crypto earning tax report, whilst identifying tax issues and ultimately ensuring compliance.
Steph
Company Specialist at Welcome to the Jungle
Insights
-44% employee growth in 12 months
Company
Company benefits
- 💸 Workplace pension scheme
- 🌅 25 days holiday a year
- 💆 Power down week
- 👪 Parental leave
- 😷 Paid sick leave
- 💻 Choice of laptop and working equipment
- 🏢 CBD office, with hybrid and flexible work arrangements minimum 3 days in the office
- 🚀 Work within one of the most rapidly growing industries in the world
- 🎒 Perks, including Koinly swag
- ☕ Free drinks & snacks
- 🎉 Regular and fun team social events!
Company HQ
London, UK
Leadership
Robin Singh
(Founder)Professional Associate at the National Association of Tax Professionals since 2019.
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