Location
London (Hybrid working with Thursdays in our Farringdon office and flexible remote working the rest of the week)

Hours
Typical working hours are 10 am to 6 pm UK time, Monday to Friday, with flexible working supported and trust to manage your own schedule.

Salary
Competitive salary (details provided during the recruitment process)

About the Role
At Longshot Systems we build advanced platforms for sports betting analytics and trading. We are seeking a Senior Software Engineer to join the team responsible for owning and developing our trading platform. As a small, focused company, this role suits someone who can architect and implement solutions to meet product, performance, and stability goals. The team owns technical standards, coding guidelines, CI/CD, observability, and security.
The trading platform integrates with numerous bookmakers and exchanges worldwide, normalising and combining global odds data for many sports and making it available internally for trading strategies. The platform handles thousands of odds updates and trades per second with strict requirements on latency, correctness, and overall quality.
You will be central to integrating new trading venues, optimising key parts of the platform, and enhancing trading safety and speed. The platform’s core systems are built in Golang, alongside message buses and databases. While fluency in Golang is not required, it is beneficial and supported by a team of experts.
We offer a hybrid working environment with a strong focus on shipping features and contributing to the technical excellence of the platform and team.
Interview Process
Intro call (30 mins) - your background and interests
1st Technical interview (30 mins) - live code review and pair programming
2nd Technical interview (60 mins) - deep dive technical questions
Full assessment day (10:30–5 pm) - a one-day systems programming exercise simulating real work, meeting the team, office tour, and lunch provided.

Experience
- Bachelor’s or Master’s degree in a quantitative or technical subject (e.g. Maths, Electrical Engineering, Physics, Computer Science) from a top university
- Deep experience building mission-critical distributed systems (finance, gaming, telco, ad-tech, etc.) where throughput, correctness, and availability are essential
- Proven track record shipping products in small, fast-moving startup teams
- Experience delivering and maintaining production systems in at least one systems programming language (Go, C++, Rust, Java, C#, etc.) with clear, idiomatic designs
- Strong architecture and design skills, able to reason about trade-offs and produce clean, evolvable service boundaries
- Comfortable working with AWS, Linux, and build pipelines; while dedicated DevOps support exists, core competency is required
- Fluent written and spoken English with strong communication skills to collaborate effectively on technical and strategic matters

About you
Self-motivated, adaptable, and passionate about building robust, high-performance systems. You thrive in a small team environment and enjoy contributing to both feature delivery and technical excellence.

Qualifications
Bachelor’s or Master’s degree in a relevant quantitative or technical field is required.

Nice to have
- Experience in trading, market making, or exchange platforms