Senior Front Office Software Engineer

Castleton Commodities International ( is a global leader in energy commodity trading and asset investment. Our Data Science & Technology team is central to our success, engineering the high-performance systems and innovative tools that power our commercial decision-making. We build platforms that help our front-office teams understand market behavior, forecast price movements, and manage risk. Our team solves complex, high-impact challenges using a modern technology stack. We develop everything in cloud-native infrastructure from real-time analytics to back testing engine, third party integrations, and internal libraries, all designed to give CCI a competitive edge in the global commodities markets. We are seeking a Front Office Software Engineer to join our Data Science & Technology (DS&T) team in London, sitting at the intersection of technology and trading. The initial scope of work for this role will be centered on short-term power initiatives, building tools and systems that directly enable traders and quantitative analysts to test and execute strategies efficiently in fast-moving power markets. This includes delivering production-grade tools, data services, and real-time applications that enhance decision-making and strategy deployment for the European Intraday Power desk. The successful candidate will design, develop, and maintain real-time trading applications, analytics platforms, and data pipelines that are critical to systematic trading and risk management workflows. This is an exciting opportunity to work within a fast-paced, data-driven trading environment, contributing directly to systematic trading and risk management efforts. Responsibilities: Partner directly with traders and analysts to engineer and optimize trading processes, analytical models, and systematic strategies. Build and maintain scalable, high-performance Python services and APIs that power our analytics platform. Develop solutions to support supply and demand models, market data analysis, and strategy research. Design and implement cloud-native tools, including real-time analytics, visualization interfaces, and workflow automation, that integrate seamlessly into our Front Office platform. Design and build a robust, reusable framework that integrates seamlessly with the Data Science & Technology data platform to support back-testing activities. Ensure low-latency data access and efficient system performance across real-time price feeds, position tracking, and order execution tools. Partner with Data Engineers to integrate live and historical market data for modeling, forecasting, and back-testing workflows. Qualifications: Bachelor’s degree in Computer Science, Engineering, Mathematics, or related field of study. 10+ years of professional Software Engineering experience in Python, leveraging modern frameworks, APIs, and cloud-native architecture, with a minimum of 5 years supporting Intraday Short-Term Power trading or similar real-time energy market environment. Strong foundation in Computer Science fundamentals, including data structures, algorithms, and software design principles. Familiarity with fundamental and weather datasets, as well as market data sources such as EPEX, ENTSO-E, or Nord Pool. Advanced knowledge of SQL and relational database technologies. Familiarity with DevOps practices, including Docker and cloud-native deployments. Experience in Linux and Windows environments. Exposure to AWS & Snowflake technologies is highly desirable. Ability to communicate effectively across technical and non-technical audiences. Strong attention to detail, problem-solving skills, and a passion for technology innovation. Must be able to work effectively in a fast-paced, dynamic and high-intensity environment including open-floor plan if applicable to the position, with timely responsiveness and the ability to work beyond normal business hours when required. Employee Programs & Benefits: CCI offers competitive benefits and programs to support our employees, their families and local communities. These include: Competitive comprehensive medical, dental, retirement and life insurance benefits Employee assistance & wellness programs Parental and family leave policies CCI in the Community: Each office has a Charity Committee and as a part of this program employees are allocated 2 days annually to volunteer at the selected charities. Charitable contribution match program Tuition assistance & reimbursement Quarterly Innovation & Collaboration Awards Employee discount program, including access to fitness facilities Competitive paid time off Continued learning opportunities Visit to learn more