{ “@context”: “http://schema.org”, “@type”: “JobPosting”, “title”: “Senior Software Engineer in London”, “description”: “
Senior Front Office Software Engineer – Real‑Time Trading Systems
Contract – Inside IR35
£700 – £1100 per day
London – Hybrid (3 days in office)
The Short Version.
You must be a senior software engineer with experience in trading environments. You need to be a well‑rounded engineer in Python, C# / .NET or other object‑oriented with an ability to deliver real‑time cloud based solutions at the speed a trading desk needs.
What You’ll Do
- Build, enhance and support real‑time trading systems across gas and power markets
- Own delivery end‑to‑end: design, build, test, deploy and iterate
- Partner closely with traders, analysts and quants to refine rapidly evolving requirements
- Contribute to strategic rebuild efforts, including a long‑term shift towards C#
- Improve ingestion, validation and analytics tooling across Front Office platforms
- Shape architecture and steer the technical direction of key systems
- Collaborate with a mixed London/Denmark engineering team in a highly business‑facing environment
Tech Stack
- C# / .NET (strategic direction)
- Python (current tooling base)
- Java or other object‑oriented also considered
Cloud
- AWS (current environment)
Frontend
- Angular
- Svelte
- React experience also relevant
Data / Messaging
- Strong database fundamentals (Postgres, ClickHouse or equivalent)
- Kafka or similar real‑time messaging technologies
What We’re Looking For
- Strong software engineering experience in Front Office or real‑time trading environments
- Proven ability to build and support low‑latency or event‑driven systems
- Comfortable working directly with demanding trading stakeholders
- Broad engineering skillset — backend first, with UI capability where needed
- Ability to operate in a hybrid Python/C# world and contribute to long‑term technical evolution
- Architectural awareness and ability to shape platform design
- Gas/Power trading experience — otherwise must speak confidently about the markets they've supported
Team & Culture
- London team of 8 engineers (mix of backend, infra and support)
- European team of 5 engineers working closely with London
- Highly collaborative, business‑facing, delivery‑focused engineering culture
- Fast iterations, high visibility, and systems used directly on the trading floor
Contact: Barry.Ansell@Harringtonstarr.com
#J-18808-Ljbffr”, “datePosted”: “2026-05-20”, “hiringOrganization”: { “@type”: “Organization”, “name”: “Energy Jobline ZR”, “sameAs”: “https://uk.whatjobs.com/pub_api__cpl__436769592__4861?utm_campaign=publisher&utm_medium=api&utm_source=4861&geoID=299” }, “jobLocation”: { “@type”: “Place”, “address”: { “@type”: “PostalAddress”, “addressLocality”: “London” } } }Company: Energy Jobline ZR
Location: London
Job Description:
Senior Front Office Software Engineer – Real‑Time Trading Systems
Contract – Inside IR35
£700 – £1100 per day
London – Hybrid (3 days in office)
The Short Version.
You must be a senior software engineer with experience in trading environments. You need to be a well‑rounded engineer in Python, C# / .NET or other object‑oriented with an ability to deliver real‑time cloud based solutions at the speed a trading desk needs.
What You’ll Do
- Build, enhance and support real‑time trading systems across gas and power markets
- Own delivery end‑to‑end: design, build, test, deploy and iterate
- Partner closely with traders, analysts and quants to refine rapidly evolving requirements
- Contribute to strategic rebuild efforts, including a long‑term shift towards C#
- Improve ingestion, validation and analytics tooling across Front Office platforms
- Shape architecture and steer the technical direction of key systems
- Collaborate with a mixed London/Denmark engineering team in a highly business‑facing environment
Tech Stack
- C# / .NET (strategic direction)
- Python (current tooling base)
- Java or other object‑oriented also considered
Cloud
- AWS (current environment)
Frontend
- Angular
- Svelte
- React experience also relevant
Data / Messaging
- Strong database fundamentals (Postgres, ClickHouse or equivalent)
- Kafka or similar real‑time messaging technologies
What We’re Looking For
- Strong software engineering experience in Front Office or real‑time trading environments
- Proven ability to build and support low‑latency or event‑driven systems
- Comfortable working directly with demanding trading stakeholders
- Broad engineering skillset — backend first, with UI capability where needed
- Ability to operate in a hybrid Python/C# world and contribute to long‑term technical evolution
- Architectural awareness and ability to shape platform design
- Gas/Power trading experience — otherwise must speak confidently about the markets they’ve supported
Team & Culture
- London team of 8 engineers (mix of backend, infra and support)
- European team of 5 engineers working closely with London
- Highly collaborative, business‑facing, delivery‑focused engineering culture
- Fast iterations, high visibility, and systems used directly on the trading floor
Contact: Barry.Ansell@Harringtonstarr.com
#J-18808-Ljbffr…
Posted: May 20th, 2026