Staff Engineer C# .Net AWS Python - FinTech

Client Server Ltd.; Greater London; Hybrid; GBP 110,000 - 130,000; Full time

Benefits offered by this job

Bonus (20%)

Pension (5% employer contribution)

Life Assurance (4x base salary)

Employee Assistance Programme

Training and development

Job summary

Client Server Ltd. in London is seeking a Staff Engineer/Developer to lead architectural efforts and build scalable systems using C#/.NET with AWS and Python. Hybrid WFH with strong emphasis on delivering high-quality software.

You will shape technology strategy, drive technical standards, and work closely with CTO and cross-functional teams across two-week sprints. AI adoption and innovation are core priorities.

Qualifications

• Experienced Software Engineer / Developer with strong knowledge of modern software engineering best practices.
• Strong C# backend development skills, ideally also Python.
• Good knowledge of AWS.
• Experience with highly scalable systems.
• Strong CS fundamentals: OOP, data structures, design patterns.
• Interest in AI and exploring opportunities (ChatGPT, Claude, Cursor, Copilot).
• Strong analytical and problem solving skills with organisation and planning abilities.
• Business acumen and advanced communication / stakeholder management skills.

Responsibilities

• Shape the technology strategy and architect scalable solutions across the Microsoft tech stack.
• Collaborate with cross-functional Agile teams to deliver high-quality software on schedule.
• Champion engineering best practices and drive technical standards.

Skills

C# backend development

Python coding

AWS

Scalable systems

OOP fundamentals

Tools

AWS

Job description

London, Greater London | £110k - £130k per year

Staff Engineer / Developer (C# .Net AWS Python) London / WFH to £120k

Would you like to join a growing and profitable scale-up recognised as a leading FinTech disruptor, where you'll have significant influence, visibility and genuine opportunities for progression?

As a Staff Engineer, you'll play a key role in shaping the technology strategy, architecting and building highly performant, scalable solutions across the Microsoft technology stack. Collaborating closely with cross-functional Agile teams in two week sprints, you'll champion engineering best practice, drive technical standards and ensure high quality software is delivered on schedule.

There's plenty of new development ahead, with a range of new features and initiatives to shape. You'll also play a key role in driving the adoption of AI across the business, exploring opportunities such as chatbots, automation and AI powered process improvements.

This is a high-impact position with excellent visibility across the organisation. Reporting directly to and working closely with the CTO, you'll have a genuine voice in technical direction and the opportunity to see the direct results of your work as the business continues to grow.

Location / WFH:

There's a hybrid policy, with two days in the brand new London offices and flexibility to work from home two days a week (Thursdays and Fridays).

About you:

• You are an experienced Software Engineer / Developer with a strong knowledge of modern software engineering best practices
• You have strong C# backend development skills, ideally also Python coding skills
• You have a good knowledge of AWS
• You have experience of working on highly scalable systems
• You have a strong knowledge of Computer Science fundamentals such as OOP, Data Structures, Design Patterns
• You have experience with, or a strong interest in Artificial Intelligence and are keen to explore the possibilities further e.g. ChatGPT, Claude, Cursor, Copilot
• You have strong analysis and problem solving skills alongside organisation and planning abilities
• You have business acumen and advanced communication / stakeholder management skills

What's in it for you:

As a Staff Engineer / Developer you will earn a competitive package including:

• Salary to £120k
• Bonus (c20%)
• Pension (5% employer contribution)
• 25 days holiday (increasing to 27 after two years and 30 after)
• Life Assurance (4x base salary)
• Employee Assistance Programme
• Range of training, career development and supported learning
• Impactful role working on cutting edge technology