Harrington Starr jobs

Application Support Engineer EQD Application Support – Trading Systems (Fintech) £400 per day | Outside IR35 | 6‑month contract | London (Hybrid) A global electronic trading firm is strengthening its front‑line EQD production support capability. This role exists to protect revenue‑critical systems used directly by trading desks. This is a high‑impact support role where you will: - Own...

Application Support Futures Application Support – Trading & Clearing (Capital Markets) £400–£500 per day | Outside IR35 | Long‑term contract | London (Hybrid) A high‑volume futures trading organisation is hiring a senior application support specialist to own stability across trading, clearing and exchange connectivity platforms. This is a senior Futures support role where you will: - Own...

Senior C# Engineer City of London (On-site) Permanent | £90,000 – £120,000 We’re partnered with an innovative proprietary trading firm in the City of London that is hiring a Senior C# Software Engineer. You’ll work on greenfield projects, cutting-edge technology, and play a key part in shaping systems that directly influence trading performance. Key Benefits - Competitive salary with a...

Senior Software Engineer Tech Stack: C#, .NET, Microservices, Docker, Kubernetes, AWS/ Azure United Kingdom Full Remote: Perm Role Salary: £85,000 - £110,000 Harrington Starr has partnered with an innovative start up FinTech who specialise in providing market access and data from their ultra low-latency platform to financial service firms, leading exchanges and single dealers across digital...

Software Engineer London / Hybrid | Perm Role £70,000 - £90,000 Harrington Starr has partnered with a fast-growing fintech that’s transforming how businesses manage foreign exchange and treasury operations. Their technology enables clients to access institutional-grade execution, automate manual workflows, and gain greater transparency across their financial processes. Handling billions in...

You will work closely with quantitative researchers and senior engineers to design and build scalable trading infrastructure, whilst contributing to architecture decisions across networking, hardware utilisation and performance engineering. The role offers strong ownership and exposure to some of the most technically challenging problems within systematic trading and low-latency engineering.

You will work closely with quantitative researchers and senior engineers to design and build scalable trading infrastructure, whilst contributing to architecture decisions across networking, hardware utilisation and performance engineering. The role offers strong ownership and exposure to some of the most technically challenging problems within systematic trading and low-latency engineering.

Software Engineer – Execution / Trading Systems London | Office-Based | Permanent A high-performing market maker is looking to hire a Software Engineer to join its core engineering team building the systems that power live trading across global electronic markets. This is a strong opportunity for an engineer who enjoys performance-critical systems, close collaboration with highly quantitative...

Software Engineer Tech Stack: C#, .NET, Python, AI Development, SQL, Azure London - Onsite Salary Range: £70,000 - £90,000 Harrington Starr has partnered with a boutique Investment Bank, with decades of experience and exceptional performance. They are currently seeking to hire a Polyglot Engineer possessing strong experience developing front office applications and systems, written in C# and...

You will work closely with Product, Client Services, and Engineering teams to design and deliver scalable backend systems supporting post-trade workflows, reporting, integrations, and client-facing tooling. The environment combines modern Java engineering with capital markets domain exposure, including clearing, OTC derivatives, collateral, and prime brokerage workflows.

Hybrid – London | Global FinTech Innovator Our client is an established yet fast-growing FinTech specialising in high-performance market data analytics. Their platform ingests and processes terabytes of global trading data daily, powering decision-making for leading investment firms, exchanges, and research institutions. They’re now seeking a Market Data Engineering Lead to take ownership of...

Senior Software Engineer - London Harrington Starr are working alongside a unique financial trading technology firm who are seeking 10+ Senior Java Developers to join their Core Development team and build out low latency systems. You absolutely have to have is a demonstrable interest in technology, precision, and technical excellence. Our client's mission is building critical systems, so the...

Senior Software Engineer - London Harrington Starr are working alongside a unique financial trading technology firm who are seeking 10+ Senior Java Developers to join their Core Development team and build out low latency systems. You absolutely have to have is a demonstrable interest in technology, precision, and technical excellence. Our client's mission is building critical systems, so the...

Our client is a global financial services and market infrastructure business operating across commodities, energy and financial markets. They provide liquidity, execution, clearing and risk solutions to a broad institutional client base including banks, hedge funds, asset managers, traders and producers. With an international footprint and significant market presence across exchange-traded and...

Hybrid – London | Global FinTech Innovator Our client is an established yet fast-growing FinTech specialising in high-performance market data analytics. Their platform ingests and processes terabytes of global trading data daily, powering decision-making for leading investment firms, exchanges, and research institutions. They’re now seeking a Market Data Engineering Lead to take ownership of...

Our client is a global financial services and market infrastructure business operating across commodities, energy and financial markets. They provide liquidity, execution, clearing and risk solutions to a broad institutional client base including banks, hedge funds, asset managers, traders and producers. With an international footprint and significant market presence across exchange-traded and...

You will work closely with Product, Client Services, and Engineering teams to design and deliver scalable backend systems supporting post-trade workflows, reporting, integrations, and client-facing tooling. The environment combines modern Java engineering with capital markets domain exposure, including clearing, OTC derivatives, collateral, and prime brokerage workflows.

Low Latency Java Engineer London | Hybrid Electronic Trading / Distributed Systems / FinTech A leading global trading technology business is looking to hire a Low Latency Java Engineer to join a high-performing Core Trading team building the systems at the heart of a large-scale electronic trading platform. This is a hands-on backend engineering role focused on developing low-latency,...

Software Engineer – Execution / Trading Systems London | Office-Based | Permanent A high-performing market maker is looking to hire a Software Engineer to join its core engineering team building the systems that power live trading across global electronic markets. This is a strong opportunity for an engineer who enjoys performance-critical systems, close collaboration with highly quantitative...

Software Engineer Tech Stack: C#, .NET, Python, AI Development, SQL, Azure London - Onsite Salary Range: £70,000 - £90,000 Harrington Starr has partnered with a boutique Investment Bank, with decades of experience and exceptional performance. They are currently seeking to hire a Polyglot Engineer possessing strong experience developing front office applications and systems, written in C# and...