Senior / Lead C# Developer, Mulhouse

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 organization.

Location:

This role is based in

Mulhouse and St. Louis, France , and requires working

on‑site

at the client location as part of a collaborative delivery team.

Key Responsibilities

Design, develop, and maintain

secure, scalable applications

using

C# and .NET

(including

.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

across the delivery lifecycle

Lead and mentor developers through

code reviews , coaching, and the promotion of best practices

Ensure solutions comply with client

security ,

risk , and

regulatory

requirements

Work closely with client stakeholders, product owners, and internal delivery teams to define and deliver solutions

Contribute to

technical estimations , planning, and delivery commitments

Identify, communicate, and mitigate

technical risks

in a client‑facing environment

Support production readiness through strong documentation, testing discipline, and operational awareness

Required Skills&Experience

Strong commercial experience with

C#

and the

.NET ecosystem

Proven experience in a

Senior and/or Lead

engineering role (team leadership, ownership of delivery)

Solid understanding of

enterprise application architecture , OO design principles, and common design patterns

Hands‑on experience building and consuming

RESTful APIs

Strong knowledge of

relational databases

(e.g.,

SQL Server ,

Oracle ,

PostgreSQL ) and SQL performance fundamentals

Experience with

cloud and hybrid

environments ( Azure preferred )

Familiarity with

security, compliance, and risk

considerations in banking or other regulated industries

Comfortable working in a

client‑facing

role with high expectations on quality, communication, and delivery

Strong collaboration and stakeholder‑management skills in multi‑team environments

Nice to Have

Previous 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, and/or

event‑driven

architectures

Knowledge of

CI/CD pipelines ,

DevSecOps , and automated testing practices

Experience working in

agile delivery models

within enterprise environments (Scrum/Kanban)

#J-18808-Ljbffr