Principal Software Engineer

Job description

Principal Software Engineer

(£130,000 - £155,000 + bonus)

About the Company:

A publicly-traded fintech (NYSE-listed) operating one of the world's most-visited platforms for finance news and data, serving millions of users globally. The engineering team is responsible for infrastructure that handles high-volume real-time market data and powers critical decision-making for institutional and retail audiences.

The Opportunity:

This is a high-impact technical leadership role with broad ownership across the core platform. You'll be tackling challenges that matter: optimizing data exchange integrations, building resilient real-time pipelines that process market data at scale, designing infrastructure for performance and reliability, and modernizing legacy systems that underpin a platform millions depend on daily.

The work spans the full technical stack from data ingestion and processing architecture to infrastructure optimization with the autonomy to make architectural decisions that directly impact system performance and user experience.

Requirements:

• 8+ years backend development experience with demonstrated technical leadership as Lead/Staff/Principal Engineer
• Deep expertise building and operating large-scale distributed systems in production
• Polyglot engineering background; strong proficiency in Node.js or Golang preferred
• Hands-on experience designing and scaling modern database architectures (SQL and NoSQL)

Nice to Have:

• Production experience with Google Cloud Platform
• Understanding of financial markets, trading systems, or blockchain/crypto infrastructure
• Kubernetes experience in production environments

Why This Role?

Work on infrastructure that processes massive volumes of real-time financial data, solve complex distributed systems challenges at scale, and have meaningful technical ownership in a publicly-traded company where your work directly impacts how millions of people access critical financial information.

Extra information

Status

Open

Education Level

Secondary School

Location

London Area

Type of Contract

Full-time jobs

Published at

27-02-2026

Profession type

Accountancy

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English