Senior Developer (LNG)

SEFE Group; Greater London; Hybrid; GBP 70,000 - 100,000; Full time

Job summary

SEFE Group in London is seeking a Senior Developer to design, develop, and deliver business-critical applications across the trading lifecycle. You will combine hands-on engineering with technical leadership and mentoring to shape SEFE’s technology landscape.

You will deliver scalable software for trading, risk, and operations, collaborate with technical leads and stakeholders, and drive engineering best practices while coaching junior developers and contributing to roadmaps.

Qualifications

• Proven experience delivering enterprise-scale software with .NET, C#, Web API, SQL Server.
• Strong architecture and OO design skills, SOLID principles, and CI/CD/DevOps.
• Experience in trading/financial services environments with data-intensive workloads.
• Proven technical leadership, code reviews, and mentoring.

Responsibilities

• Design, develop, and deliver scalable software supporting trading, risk, and operations.
• Collaborate with leads, QA, and stakeholders to align priorities.
• Provide technical leadership and adherence to architectural standards.
• Address technical debt and contribute to roadmaps.
• Support cross-platform integration and mentor junior developers.

Skills

.NET

C#

Web API

SQL Server

CI/CD

DevOps practices

Architectural design

Mentoring

Stakeholder management

Communication

Job description

As a Senior Developer, you will play a key role in designing, developing, and delivering business-critical applications that support the end-to-end trading lifecycle across SEFE’s trading organisation. Combining hands‑on technical expertise with technical leadership and mentoring responsibilities, you will help shape the evolution of our trading technology landscape while supporting the development and growth of fellow engineers.

WHAT WILL YOU DO

• Design, develop, and deliver high-quality, scalable, and maintainable software solutions that support trading, risk, and operational processes across the business.
• Collaborate with Technical Leads, Architects, QA, Functional Leads, and business stakeholders to ensure delivery priorities are aligned and solutions meet business and technical objectives.
• Provide technical leadership across a portfolio of applications, ensuring adherence to architectural principles, engineering standards, and best practices throughout the software development lifecycle.
• Drive continuous improvement by identifying and addressing technical debt, contributing to technology roadmaps, and promoting consistency across development frameworks, tools, and engineering practices.Support system integration and cross-platform development activities, working closely with architects and development teams to deliver robust and sustainable technical solutions.
• Coach and mentor junior developers, supporting knowledge sharing, capability development, code quality, and engineering excellence across the team.

WHAT WILL YOU BRING

• Proven experience delivering enterprise-scale software solutions using Microsoft .NET, C#, Web API, SQL Server, and modern software engineering practices within complex business environments.
• Strong understanding of software architecture, object-oriented design, design patterns, SOLID principles, and modern development methodologies including CI/CD and DevOps practices.
• Experience working within trading, commodities, financial services, or other highly transactional and data-intensive environments, with an understanding of business-critical systems and delivery expectations.
• Strong technical leadership capabilities with experience conducting code reviews, influencing technical direction, and balancing long-term architectural goals with practical delivery needs.
• Passion for mentoring and developing others, with experience supporting junior developers and fostering collaborative, high-performing engineering teams.
• Excellent communication and stakeholder management skills, with the ability to explain complex technical concepts to both technical and non-technical audiences.

ABOUT US

SEFE is an international energy company anchored in Europe, delivering energy solutions that ensure reliable and affordable supply. Our activities span the entire energy value chain – from origination and trading to sales, transport and storage. With decades of trading expertise and a growing LNG portfolio, SEFE is one of Europe’s leading suppliers to industrial customers, providing more than 200 TWh of gas and power each year. We supply over 50,000 clients, from small businesses to municipalities and multinational organisations. By investing in clean energies, we support our customers on their decarbonisation journey and contribute to the energy transition. SEFE employs over 2,000 people worldwide and is owned by the Federal Government of Germany.

Securing energy – now and for the future.

OUR BENEFITS

We’re committed to creating an inclusive environment that embraces diversity and fosters the development of knowledge, skills, and experience. Whatever your role, you’ll find an open, welcoming atmosphere that empowers you, and recognises your contribution.

This is a contract role, initially for 6 months with the potential to extend. Based in our London office, conveniently located close to travel networks we offer the opportunity to follow a hybrid working model.

Join SEFE and help us secure gas supply across Europe and shape a better, more sustainable tomorrow.

Business Function: Information Technology