Full-Time
Senior Front Office Software Engineer
Posted on 12/13/2025
Castleton Commodities International
501-1,000 employees
Energy trading and infrastructure asset investing
No salary listed
London, UK
In Person
 Software Engineering (1) |
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- Strong professional experience in any programming language (Python would be a plus).
- Good knowledge of SQL and relational database technologies.
- Familiarity with modern DevOps practices.
- 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.
- Partner directly with traders and analysts to engineer and optimize trading processes, analytical models, and systematic strategies.
- Build and maintain robust, performant Python-based 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.
- Exposure to AWS and Snowflake technologies is highly desirable.
- Prior experience building or working on back testing engines and systematic trading is a plus.
- Prior experience in energy or commodities trading is a major plus.
Castleton Commodities International trades energy and invests in energy infrastructure assets using deep fundamental research and data analytics. It buys and sells physical energy commodities and owns or funds infrastructure assets like storage facilities and pipelines, guided by market research to forecast supply and demand and to manage risk. It stands out by combining rigorous fundamental analysis with analytics and by blending short-term trading with long-term infrastructure ownership, unlike firms that focus on only one approach. Its goal is to provide sustainable, reliable energy while growing capital through disciplined trading and asset investments.
Company Size
501-1,000
Company Stage
Debt Financing
Total Funding
$2.1B
Headquarters
Stamford, Connecticut
Founded
2001
Simplify's Take
What believers are saying
- CCI renewed $2.1B credit facilities in November 2025 with 17 banks oversubscribed.
- CCI acquired Linden VFT on February 11, 2026, enabling PJM-NYISO bi-directional transfer.
- CCI bought Hunlock Creek 169 MW plant from UGI in November 2024 for Marcellus access.
What critics are saying
- US natural gas price spikes erode Marcellus assets' throughput in 6-12 months.
- German BESS projects delay past 2026-2028 due to grid and permitting bottlenecks.
- PJM capacity prices crash below $100/MW-day in 2026 from gas-solar oversupply.
What makes Castleton Commodities International unique
- CCI integrates commodity trading with ownership of gas plants and transmission assets.
- CCI expands globally, acquiring 310 MW BESS portfolio in Germany via S4 Energy.
- CCI optimizes power assets like Hunlock Creek for storage and data center expansion.
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Benefits
Health Insurance
Dental Insurance
Life Insurance
Employee Assistance & Wellness Programs
Parental Leave
Charitable Contribution Match Program
Tuition Assistance & Reimbursement
Paid Time Off
Continued Learning Opportunities
Employee Discount Program
Gym Membership
Company News
T and Castleton Commodities International, has bought a 70% stake in east Texas gas assets from Chevron for $525 million, the company said on Tuesday, as it expands its U.S. gas business.
STAMFORD, Conn., Dec. 3, 2024 /PRNewswire/ -- Castleton Commodities International LLC (CCI) has announced the renewal of two credit facilities totaling $2.1 billion. The facilities include a $1.9 billion secured borrowing base facility, divided into an $800 million one-year tranche and a $1.1 billion two-year tranche. The secured facility also features a $1 billion accordion option to enhance CCI's liquidity and support future growth. In addition, there is a $200 million one-year committed unsecured revolving credit facility. Consistent with last year, the bank group includes 16 banks from nine different countries
UGI Corporation, a diversified energy company with midstream (pipeline) operations in the Marcellus and one of Pennsylvania's largest utility companies, is selling its 169-megawatt natural gas-fired power plant near Wilkes-Barre, PA, to Castleton Commodities International for an undisclosed amount.
STAMFORD, Conn., Nov. 19, 2024 /PRNewswire/ -- Castleton Commodities International LLC (CCI) announced today that a subsidiary has acquired the Hunlock Creek Energy Center (Hunlock) in Luzerne County, Pennsylvania, from UGI Energy Services LLC. Hunlock is a 169-megawatt natural gas-fired power plant in PJM, a regional transmission organization, with access to natural gas from the Marcellus Shale, the largest natural gas-producing formation in the United States. "We continue to expand our U.S. power portfolio with high-quality assets and are excited to add Hunlock to the portfolio," said Jordan Love, principal in CCI's Principal Investments team. "Hunlock is a great fit for our asset optimization capabilities, and we are exploring multiple paths for expansion, including energy storage, data center development and additional gas-fired capacity. We are dedicated to facilitating a seamless transition of ownership and maintaining Hunlock as a reliable and cost-effective power source."
Terra One Climate Solutions GmbH, a pioneer in grid scale battery energy storage systems (BESS) in Germany, has announced an agreement to sell a 310 MW portfolio of stand-alone battery storage project rights in Germany to Castleton Commodities International LLC (CCI), a global energy commodities merchant and infrastructure asset investor.