Staff Engineer C#.Net Aws Python - Fintech

Client Server; Greater London; Hybrid; GBP 100,000 - 120,000; Full time

Benefits offered by this job

Bonus (20%)

Pension 5% employer contribution

25 days holiday

Life Assurance 4x base salary

Employee Assistance Programme

Training and development opportunities

Impactful role

Job summary

Client Server in London is seeking a Staff Engineer / Developer to shape the technology strategy and build scalable services using C#/.NET, AWS and Python. You will work with cross-functional Agile teams in two-week sprints, championing best practices and driving AI-powered improvements.

The role offers high impact, direct CTO exposure and a hybrid London-based/remote working arrangement with a clear path to progression.

Qualifications

• Experienced Software Engineer/Developer with modern software engineering practices.
• Strong C# backend development, ideally also Python.
• Good knowledge of AWS.
• Experience with highly scalable systems.
• Strong CS fundamentals: OOP, data structures, design patterns.
• Experience or interest in AI (e.g., ChatGPT, Claude, Copilot).
• Strong analytical, planning and stakeholder communication skills.

Responsibilities

• Shape technology strategy and architect scalable services.
• Collaborate with cross-functional Agile teams in two-week sprints.
• Champion engineering standards and deliver high-quality software.
• Drive AI adoption across the business (chatbots, automation).
• Report to CTO with visibility into technical direction and impact.

Skills

C# backend

Python

AWS

Scalable systems

OOP

Data Structures

Design Patterns

AI interest

Communication

Stakeholder management

Job description

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