C# / .Net Software Engineer (Freelance / contractor)

Job description

Qim info – Who are we?

Founded in 2004, Qim info is an Swiss IT engineering and digital services company.

We regularly collaborate with international clients and are looking for skilled contractors to support project-based engagements.

Your responsibilities:

The objective of this role is to design, build, and govern an API integration layer connecting multiple internal and external systems within a complex energy trading environment.

Required technical skills:

• API & Integration Architecture:

Strong expertise in API integration, REST API design and exposure, interface-driven architectures, integration-heavy environments, abstraction layers, system decoupling

• Backend Development:

.NET Core, C#, API services, integration services

• Architeture & Platforms:

Design of scalable and reusable integration layers, interoperability with multiple systems (internal & external), data platforms and downstream applications

• Methodologies:

Agile / Scrum environments, full lifecycle involvement (design, build, evolve), technical documentation and governance

Engagement conditions:

• Contractor / Freelance agreement
• Full-time assignment
• Start date: ASAP
• Location: London-based

Your profile:

Experience in Trading / Finance / Energy environments

Senior API / Integration expert with a strong architectural mindset,

Solid experience designing and implementing REST and legacy integrations,

Strong background in .NET Core and Microsoft Stack

Structured, rigorous

Excellent communication skills with technical stakeholders,

Comfortable working mainly with technical teams in a transverse role,

Interested in learning more?

We look forward to receiving your application

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Extra information

Status

Open

Education Level

Secondary School

Location

London Area

Type of Contract

Full-time jobs

Published at

22-04-2026

Profession type

ICT

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English