Senior / Lead C# Developer, Mulhouse

Role Overview We are an established IT services company working closely with clients in the banking and financial services sector. We are looking for a Senior / Lead C# Developer to lead the design and delivery of enterprise‑grade software solutions for a major banking client. This role combines hands‑on development with technical leadership, operating within a regulated banking environment while remaining part of a professional, delivery‑focused IT organisation.

Key Responsibilities

Design, develop, and maintain secure, scalable applications using C# and .NET (.NET Core / .NET 6+)

Act as technical lead for development activities on banking client engagements

Take ownership of solution architecture, code quality, and technical standards

Lead and mentor developers through code reviews, coaching, and best practices

Ensure solutions comply with client security, risk, and regulatory requirements

Work closely with client stakeholders, product owners, and internal delivery teams

Contribute to technical estimations, planning, and delivery commitments

Identify, communicate, and mitigate technical risks in a client‑facing environment

Required Skills And Experience

Strong commercial experience with C# and the .NET ecosystem

Proven experience in a senior or lead engineering role

Solid understanding of enterprise application architecture and design patterns

Experience building and consuming RESTful APIs

Strong knowledge of relational databases (e.g., SQL Server, Oracle, PostgreSQL)

Experience with cloud and hybrid environments (Azure preferred)

Familiarity with security and compliance requirements in banking or regulated industries

Comfortable working in client‑facing roles with high expectations on quality and delivery

Nice to Have

Prior experience working for an IT consultancy or systems integrator

Exposure to banking platforms, core banking systems, or financial data flows

Experience with microservices, messaging systems, or event‑driven architectures

Knowledge of CI/CD pipelines, DevSecOps, and automated testing

Experience working in agile delivery models with enterprise clients

What We Offer

Competitive salary and benefits package

Hybrid working model with London as primary client location

Exposure to complex, high‑impact banking projects

A professional consulting environment with strong technical standards

Clear career progression within technical leadership or solution architecture

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