Summer 2026
Front Office Software Engineer Internship
Posted on 8/23/2025
Castleton Commodities International
501-1,000 employees
Energy trading and infrastructure asset investing
No salary listed
London, UK
In Person
 Software Engineering (3) |
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- Currently pursuing a Bachelor’s or Master’s degree in Computer Science, Engineering, Management Information Systems, or related technical field of study.
- Expected graduation date of Winter 2026 or Spring/Summer 2027.
- Strong programming experience in Python (preferred libraries: Pandas, NumPy, etc.)
- Familiarity with version control tools (e.g., Git) and software development best practices.
- Strong problem-solving abilities and an eagerness to learn about financial markets and trading systems.
- Excellent communication skills and ability to work in a fast-paced, collaborative environment.
- Contribute to the development of front office software tools that support real-time trading, market data analytics, and visualization.
- Work with the commercial trading team to optimize and re-engineer pricing models, decision tools, and trading workflows.
- Build and enhance Python-based microservices and APIs for internal data access and operations automation.
- Assist in building data visualization dashboards using libraries such as Streamlit, integrating commercial KPIs, price curves, and supply/demand analytics.
- Participate in cloud-native application development using AWS services, including Kubernetes and Kafka.
- Support automation of deployment processes using modern DevOps tools (e.g., Git, Docker, Helm, CI/CD pipelines).
- Collaborate with the Data Science team to help integrate ML-driven analytics into front office workflows.
- Strong programming experience in Python (preferred libraries: Pandas, NumPy, etc.)
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
$4.2B
Headquarters
Stamford, Connecticut
Founded
2001
Your Connections
People at Castleton Commodities International who can refer or advise you
Simplify's Take
What believers are saying
- Oversubscribed $2.1B credit facilities from 17 banks signal lender confidence.
- $1B accordion option enhances liquidity for infrastructure expansions.
- Tokyo Gas $525M Chevron deal expands CCI's U.S. shale gas footprint.
What critics are saying
- $800M tranche matures November 2026, forcing refinance amid rate hikes.
- PJM capacity prices crash 40% post-2025 slashes Hunlock revenues 60%.
- Mercuria's $1.2B Vitol acquisition undercuts CCI's PJM spreads 15-25%.
What makes Castleton Commodities International unique
- CCI integrates commodity trading with ownership of gas plants and BESS assets.
- S4 Energy subsidiary pioneers 310 MW German BESS portfolio operational 2026-2028.
- Acquired Hunlock Creek 169 MW plant accesses Marcellus Shale gas in PJM.
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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
Growth & Insights and Company News
6 month growth
↑ 1%1 year growth
↑ 1%2 year growth
↑ 1%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.