C# Software Engineer / Team Lead

Client Server Limited; Humanes de Madrid; Hybrid; EUR 68,000 - 82,000; Full time

Benefits offered by this job

Holiday: 23 days

Birthday day off

Pension

Life Assurance

Income Protection

Critical Illness Cover

Healthcare

Hybrid working

Job summary

Client Server Limited is hiring a C# Software Engineer / Team Lead in Madrid with hybrid WFH. You will lead the squad, own architecture, design APIs, and guide production operations while remaining hands-on with code across the stack.

Expect to mentor engineers, drive best practices, and champion AI adoption. You’ll work with Product Managers on roadmaps and priorities, and participate in architecture reviews.

Qualifications

• Strong team leadership within software engineering.
• Expertise in backend C# .NET and distributed systems design.
• Frontend experience with Vue.js, React or modern Angular.
• Proficient in SQL and relational databases.
• Production AWS experience (SQS, DynamoDB, S3, ECS, Lambda).
• Experience owning CI/CD and release processes (GitHub Actions).
• Hands-on with AI/code tools (Claude Code, Cursor, Copilot).
• Excellent collaboration and stakeholder communication; payments/regulated industry exposure a plus.

Responsibilities

• Lead the squad across architecture, development, delivery and production operations.
• Write production code and tackle complex technical challenges.
• Own system architecture, API design and technical decisions.
• Mentor the team and drive continuous improvement and best practices.
• Collaborate with Product Managers on roadmaps and priorities.

Skills

Team leadership

C# .NET

System design

Frontend frameworks

SQL

AWS

CI/CD

AI tooling

Communication

Tools

AWS

SQS

DynamoDB

S3

ECS

Lambda

GitHub Actions

Claude Code

Cursor

Copilot

Job description

C# Software Engineer / Team Lead Madrid / WFH to €82,000

Are you a skilled C# Software Engineer with strong team leadership experience?

You could be joining a global financial services company as they rebuild the international payments platform, working within the Corporate Payments division.

As a C# Software Engineer / Team Lead you'll lead your Squad across architecture, development, delivery and production operations whilst remaining hands-on, writing production code and tackling the most technically complex problems. You'll own system architecture, API design, technical decisions, design reviews and code quality and partner with Product Managers on roadmaps, delivery plans and priorities.

Providing technical leadership, mentoring, 1-2-1s and feedback you'll help to develop the engineers within the team, ensuring continuous improvement and setting standards for how the team builds, tests and ships. You'll champion AI and agentic coding tools across the software development lifecycle, driving process improvements and modern techniques.

This is ideal for a senior engineer who wants to lead from the front - combining technical ownership, hands-on development and genuine responsibility for the growth of the team.

Location / WFH:

You join colleagues in the Madrid office 2-3 days a week, with flexibility to work from home the other days.

About You

• You have strong experience providing technical / team leadership within a software engineering team
• You have strong backend development skills with C# .Net (would also consider other OO languages)
• You have strong system design experience, particularly distributed systems and microservices
• You have frontend experience with Vue.js, React or modern Angular
• You have a good knowledge of SQL and relational databases
• You have production experience with AWS, ideally including SQS, DynamoDB, S3, ECS and Lambda
• You have experience owning CI/CD and release processes, such as GitHub Actions
• You have hands-on experience with Claude Code, Cursor, Copilot or similar agentic tools, with a clear view on effective AI adoption
• You're collaborative and pragmatic with great communication skills, with the ability to explain technical decisions to both engineering and business stakeholders
• A background in payments, FX or another regulated industry would be of benefit
• You have fluent English skills

What's In It For You

• Salary to €82,000 + bonus
• 23 days holiday, rising to 28 + your birthday off
• Pension, Life Assurance, Income Protection, Critical Illness Cover
• Healthcare
• Hybrid working