Staff Engineer C# .Net AWS Python - FinTech

Client Server Limited; Greater London; Hybrid; GBP 72,000 - 120,000; Full time

Benefits offered by this job

Bonus (20%)

Pension (5% employer contribution)

Life Assurance (4x base salary)

Employee Assistance Programme

Training & career development

Job summary

Client Server Limited is hiring a Staff Engineer / Developer in London with hybrid WFH to £120k. You will architect and deliver scalable C#/.NET solutions, leverage AWS, and apply Python where beneficial, working closely with CTO and cross-functional teams in two-week sprints.

You'll drive technical standards, explore AI opportunities such as chatbots and Copilot, and help shape the technology roadmap while enjoying a competitive package and pension in a confidential scale-up FinTech environment.

Qualifications

• Experience building backend systems using C#/.NET.
• Proficiency in Python and cloud-based architectures (AWS).
• Strong fundamentals in OOP, data structures and design patterns.

Responsibilities

• Architect and build highly performant, scalable solutions on the Microsoft stack.
• Shape technology strategy and champion engineering best practices.
• Collaborate with cross-functional Agile teams and drive AI adoption across the business.

Skills

C# backend

Python

AWS

Scalability

OOP

Data structures

Design patterns

AI interest

Stakeholder comms

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 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 abilitiesYou 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