Staff engineer Work, Jobs in Harlesden, Gtl (with Salaries)

Frontend Staff Engineer
Koinly —London
- £80,000 - £120,000 a year
- Remote
- Typing
- AI
- Annual leave
Quick apply
IT Support Technician
IT MANAGMENT LTD —London
- From £39,000 a year
- Full-time
- Hybrid work
- Customer service
- Windows
- Microsoft Office
- Free parking
- Annual leave
Quick apply
Anthropic Fellows Program, AI Safety & Security
Anthropic —London
- £2,310 - £4,300 a week
- Part-time
- Remote
- Research
- Master's degree
- Bachelor's degree
- Flexible schedule
IT Support Engineer Apprentice
JBC Skills Training Ltd —London
- £23,000 a year
- Full-time
- Analysis skills
- Travel
- SharePoint
Quick apply
11d
Support Technician Agilent Measurement Suite
Imperial College London —White City
- £42,505 - £47,213 a year
- Full-time
- Computer literacy
- Annual leave
IT Support Engineer
Anthropic —London
- £130,000 - £175,000 a year
- Hybrid work
- Google Suite
- Bachelor's degree
- Scripting
- Flexible schedule
13d
Anthropic Fellows Program, The Anthropic Institute (Economics & Policy)
Anthropic —London
- £2,310 - £4,300 a week
- Part-time
- Remote
- Research
- Bachelor's degree
- Communication skills
- Flexible schedule
Assistant Manager - Operations
Milverdene —London
- £32,000 - £38,000 a year
- Full-time
- Management
- English
- Administrative experience
- Free parking
Quick apply
Contract Manager - Northern Trains
APCOA PARKING (UK) LTD —Uxbridge
- £43,000 a year
- Microsoft Word
- Continuous improvement
- Travel
- Annual leave
- Employee discount
Quick apply
Data Centre Technician , Data Centre Operations
Amazon Data Services UK Limited —Slough
- 12 hour shift
- Computer Science
- Bachelor's degree
- Travel
Service Desk Engineer (Field)
Charles Square —London
- £42,500 a year
- Full-time
- Hybrid work
- Organisational skills
- Communication skills
- Annual leave
- Gym membership
Quick apply
Assistant Healthcare Scientist
UK Health Security Agency —Colindale
- £29,613 - £30,266 a year
- Part-time
- Computer literacy
- Laboratory experience
- Presentation skills
6d
Field Operations Support Coordinator
Dyno Plumbing —Watford
- From £38,000 a year
- Full-time
- Plumbing
- Travel
- Mentoring
Quick apply
5d
Fire Door Call Centre Operator
CF Fire Doors —London
- £30,000 - £35,000 a year
- Full-time
- Computer literacy
- English
- Data entry
Quick apply
5d
Administrator
Milverdene —London
- £27,000 - £32,000 a year
- Full-time
- English
- Administrative experience
- Data entry
- Free parking
Quick apply
6d
Anthropic Fellows Program
Anthropic —London
- £2,310 - £4,300 a week
- Part-time
- Remote
- Research
- Master's degree
- Bachelor's degree
- Flexible schedule
Personal Assistant
JJ & Sterling Developments Ltd —West London
- £25,420.00 - £50,181.77 a year
- Full-time
- Microsoft Powerpoint
- Microsoft Word
- Google Suite
Quick apply
Environment, Health and Safety Specialist
Anthropic —London
- £110,000 - £140,000 a year
- Hybrid work
- Computer literacy
- Bachelor's degree
- Computer skills
- Flexible schedule
14d
Research Associate
Imperial College London —South Kensington
- £43,863 - £57,472 a year
- Full-time
- Research
- Organisational skills
Field Service Representative (Devon area)
Roche —London
- Engineering
- Maintenance
- Communication skills

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Frontend Staff Engineer

Koinly -
London

Apply Now

Job details

Permanent
£80,000 - £120,000 a year

Benefits

Annual leave

Qualifications

Jira
Performance tuning
Node.js
PostgreSQL
Redis
Ruby
GitHub
Front-end development
Typing
Data visualisation
AI
Heroku
TypeScript
React Native
Design patterns

Full job description

Koinly is a successful product used by crypto investors around the world, helping them make sense of complex portfolios and tax obligations across chains, wallets, exchanges, and Defi protocols. The bar is simple to describe and hard to deliver: a user should be able to reconcile thousands of transactions and file their taxes in under 20 minutes.

We're looking for a Frontend Staff Engineer to take deep ownership of our data platform - the engine behind products at the intersection of crypto, finance, and tax. You'll work across a modern React web application and a high-performance distributed data-processing backend, with a new React Native mobile app joining your scope in the future.

This is a senior, hands-on role for someone who combines exceptional engineering craft with genuine product ownership. We expect you to lead by example: writing high-quality code, making sound architectural decisions, and raising the bar for the entire frontend team.

We’re a remote-first, async-first startup with deep product-market fit. If you value autonomy, technical excellence, and clear communication over meetings and process complexity, Koinly is the place for you.

Read on for responsibilities, requirements, and who we are.

Role at a glance

Mission: Own frontend features end-to-end ensuring a high-performance experience for complex crypto tax data.
Location: Remote - Strictly Europe (EU / UK timezones)
- Note, we won’t review job applications from outside Europe.
Employment: B2B Contract.
Compensation: USD $80k – $120k/y.
Perks: 32 days PTO (incl. public holidays).
Experience: 8+ years with a focus on complex, data-heavy web applications.

Work within one of the most rapidly growing industries in the world

What we're looking for

We're looking for someone who thrives on complex, business-critical financial web applications - systems with real architectural depth and high stakes. You’ll focus on optimizing, refactoring, and elevating our existing codebase while steadily delivering critical new features for a high-performance interface that handles massive datasets and complex DeFi reconciliations.

Above all, we value a high sense of product ownership, exceptional code quality, autonomy, and openness: you take responsibility for outcomes, not just tasks, and you work independently while staying transparent and collaborative.

We also expect:

Deep understanding of modern, complex web application architecture and the design patterns that support it at scale.
Work closely with product and design, serving as the primary frontend partner for Product. You’ll evaluate ideas from a technical perspective, propose creative solutions, and take real ownership of our frontend strategy.
Strong attention to detail and advanced frontend styling skills, including reliable cross-browser behavior and pixel-level precision.
Fluency with the latest AI development tools such as Claude/Codex/Cursor, and the judgment to use them effectively in a professional workflow.

Tech stack

You should have deep, production-level experience across our core stack:

Frontend

React 19 with the React Compiler, in strict, modern TypeScript
TanStack ecosystem - Router, Query, and Table
Radix UI and Mantine for components
Tailwind CSS v4 (with class-variance-authority and tailwind-merge)
Vite + Vitest (unit and browser/Playwright), Storybook with Chromatic for visual regression
Highcharts for data visualization and Sentry for error monitoring
Bun runtime with modern TS tooling (oxlint, Biome)
Data parsing and wrangling: csv-parse, xlsx (SheetJS), node-html-parser
Blockchain libraries
RabbitMQ, and Redis (ioredis)

Infrastructure & tooling

PostgreSQL, Heroku, GitHub, JIRA

Nice to have

Experience building mobile applications with React Native (we plan to expand into mobile).
Public portfolio of projects available on GitHub or similar platforms.
Background working on financial products.
Hands-on experience with blockchain and crypto technologies.
Familiarity with Ruby (our services interoperate with a Ruby codebase).
Understanding of DeFi protocols and how they work on-chain.
Knows and understands our product.

️ Don’t tick all of the boxes? Neither do we

We're driven by hiring not only by experience and relevance but also by ambition. We celebrate anything ‘outside of the box’, so if you don’t meet every single listed criterion, please do still apply—we’d love to hear from you.

That said, there are two hard gates for this role:

Expert-level TypeScript. You should reach for strong typing instinctively, not as an afterthought. We deal with complex financial data where "mostly correct" isn't good enough; your TS skills should reflect that.
Deep React experience. This is a Staff level role. You should have a deep understanding of React’s internals, performance optimization, and modern tooling. We need someone who can hit the ground running with a complex, established codebase.

Why join Koinly as a frontend engineer?

One of the fastest-growing Crypto Tax Calculators in the world with solid product-market fit.
Trusted and loved: See what our customers say on Trustpilot.
Direct impact: Our users rely on Koinly for their financial compliance. Every performance optimization and UX improvement you ship directly reduces the stress of hundreds of thousands of investors.
True ownership: We don't believe in "ticket-flipping." You'll own features from the initial requirement through to the final interaction. You have the autonomy to make architectural decisions that stick.
High-signal, low-noise: We're remote-first and async-first. We don't do unnecessary meetings or processes for the sake of process. You’ll have long blocks of deep work time to actually build.

Come and shape the future of crypto tax with us

We aren't just building a calculator; we're building a platform that empowers crypto investors to make the best decisions for their financial future. If you’re ready to own a piece of that journey and build a product people actually need, we want to hear from you.

Compliance and privacy

Due to our domain, background checks are required before joining. By applying, you consent to processing your data for recruitment purposes per our privacy policy.

Apply Now

Refine Your Search

staff engineer jobs in harlesden, gtl

Frontend Staff Engineer

IT Support Technician

Anthropic Fellows Program, AI Safety & Security

IT Support Engineer Apprentice

Support Technician Agilent Measurement Suite

IT Support Engineer

Anthropic Fellows Program, The Anthropic Institute (Economics & Policy)

Assistant Manager - Operations

Contract Manager - Northern Trains

Data Centre Technician , Data Centre Operations

Service Desk Engineer (Field)

Assistant Healthcare Scientist

Field Operations Support Coordinator

Fire Door Call Centre Operator

Administrator

Anthropic Fellows Program

Personal Assistant

Environment, Health and Safety Specialist

Research Associate

Field Service Representative (Devon area)

I want to receive the latest job alerts for staff engineer in harlesden, gtl

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