Senior Fullstack Engineer

🔒 Confidential Employer
Posted 28 April 2026
LOCATION
London
TYPE
Full-time
LEVEL
Mid-Senior level
SALARY
£140,000 / year
CATEGORY
Blockchain analytics & crypto compliance
This employer holds a UK Home Office sponsor license — sponsorship for this specific role is at the employer’s discretion

SKILLS

Typescript React Nest.js Postgres Kubernetes AWS Terraform Datadog

FULL DESCRIPTION

Senior Fullstack Engineer

Company: [Employer hidden — view at passion-project.co.uk]

Location: London

Salary: £60k-£140k

Work Type: On-site

Job Type: Full-time

Experience Level: Mid-Senior level

Job Description

As a senior engineer in our Collection Engineering team, you’ll be working in the heart of [Employer hidden], building a platform for our intelligence organisation to efficiently and robustly collect intel on crypto crime and make the world a safer place. The mission of your new team is to scale the collection efforts of [Employer hidden]. Streams of intelligence come from myriad sources: external feeds, internal automation, internal analysis, client submitted data. It all needs to be classified, stored, and reviewed, before it can be processed into our market leading proprietary graph database. You will work with a team of engineers and data scientists to create tooling, optimise processes, and remove bottlenecks in these intel pipelines.

Responsibilities

  • Design and build software tools to improve and enhance our intelligence collection and analysis efforts. Examples of such tools range from services deployed on kubernetes to browser extensions and beyond
  • Develop software to analyse and interpret cryptocurrency usage behaviours and trends on the clear and dark web
  • Implement observability mechanisms to detect problems in your environment(s), and run the associated business processes to resolve
  • Work with the existing engineers on your team to foster their growth and development, and facilitate best practices, through mentoring and coaching
  • Be highly opinionated about the engineering strategy of your team, and a key contributor to the same

Who you are

  • Have a passionate interest in cryptocurrencies and blockchains and their usage (both from a technical and economic perspective) in the real-world
  • Have great coding skills Typescript and the proven ability to engineer good solutions
  • Have increased operational efficiency by integrating disparate systems
  • Enjoy working as part of a close-knit team on highly impactful problems, making the crypto ecosystem a safer space
  • Promote a positive culture of collaboration, through open and effective communication, particularly when addressing issues or raising concerns
  • Are able to form well reasoned, data driven or otherwise evidence-based arguments, to influence key stakeholders across the business
  • Know when to build PoC vs production grade software
  • 5+ years of commercial experience
  • Expert level in Typescript, plus React, Nest.js
  • Familiar with Postgres and K8s
  • Experience with AWS, Terraform, Datadog

Desirable

  • Has worked in an intelligence collection setting
  • Experience with “big data” technologies, the management of data, and data pipelines

Salary Benchmarks

Full-stack Engineer

Expert

Senior

£60k

£80k

£100k

£120k

£140k

Company Benefits

  • Share options
  • Health insurance
  • Hybrid Working
  • Individual training budget of USD 1,000 a year
  • Mental Health Support

About [Employer hidden]

Blockchain analytics & crypto compliance platform

101-200 employees

B2B, Cryptocurrency, Enterprise, Compliance, Analytics, Cyber Security, Blockchain

The rise of cryptocurrency has been dramatic. As more established financial institutions move into the sector, these companies need to understand when they can let transactions run — and when they should intervene. A key issue with most cryptocurrencies is that their nature means they can be used by criminals for illicit activities, such as money laundering. [Employer hidden]’s focus is on tackling financial compliance, and it has developed machine learning tech that screens transactions to identify suspicious patterns and dubious transactors. It offers an integrated suite of products for financial institutions to screen crypto-flows, which it analyses for links to illicit activity such as money laundering, terrorist financing and other financial crimes. [Employer hidden]’s dataset has been developed since 2014 and includes over 20 billion data points and covers 148 assets, representing 98% of the global trading volume. Two-thirds of global crypto volumes are transacted on exchanges that use [Employer hidden]’s products, highlighting the company's leadership position in the market. It works with firms like Coinbase on their internal anti-money laundering compliance, and with other big-name clients such as Santander, Revolut, Genesis, and Stellar. [Employer hidden] is currently working with several undisclosed leading research and trading desks to develop its product to maintain its strong position.

Application Instructions

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