Staff Software Engineer, Koinly

B2B Contractor

$100-115k

Salary is benchmarked based on US rates and may vary depending on the location

Postgres

Ruby

Rails

Ruby on Rails

Senior and Expert level

Remote from Europe, UK

More information about location

Tax management platform for cryptocurrency traders

Be an early applicant

Tax management platform for cryptocurrency traders

21-100 employees

FintechB2CB2BCryptocurrencyComplianceAccounting

Be an early applicant

$100-115k

Salary is benchmarked based on US rates and may vary depending on the location

Postgres

Ruby

Rails

Ruby on Rails

Senior and Expert level

Remote from Europe, UK

More information about location

21-100 employees

FintechB2CB2BCryptocurrencyComplianceAccounting

Company mission

To provide a secure and compliant cryptocurrency tax solution, giving peace of mind and confidence in tax reporting.

Job

Company

Role

Who you are

If you thrive on deep technical work and value autonomy, clarity, and craft, you’ll fit right in
Experience level: 7+ years
We value engineers who think independently, stay curious, and communicate with clarity
8+ 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

Desirable

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

What the job involves

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
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
Collaboration here means solving hard problems together, giving direct feedback, and continuously improving how we build at scale
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

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

Glassdoor (2.2)

Trustpilot (4.6)

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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