Contract length: 12 months
Rate: Up to £300/day (Inside IR35)
Location: London (Hybrid - 2 days per week onsite)
Industry: Financial Services/Capital Markets

We're looking for an experienced Senior Software Engineer/Technical Lead to join a high-performing engineering team on a 12-month contract. You'll help design, build, and scale high-performance, data-intensive systems in a fast-paced enterprise environment.

This role suits someone who is hands-on, technically strong and passionate about engineering excellence.

What you'll do

• Lead and contribute to software design and architecture for large-scale applications

• Build clean, efficient, and scalable code across the full development life cycle

• Develop and maintain RESTful APIs and microservices using C# .NET

• Drive engineering best practices, including CI/CD, automation, code reviews, and performance tuning

• Ensure high quality and reliability through unit, integration, and BDD testing

• Collaborate closely with business and engineering stakeholders to deliver impactful solutions

• Mentor junior engineers and promote a culture of continuous improvement and technical excellence

• Continuously optimise systems for performance, scalability, and security in production

What we're looking for

• 8+ years of experience as a Software Engineer in an enterprise environment

• Strong expertise in C# .NET, including REST APIs and microservices

• Solid experience with SQL Server, including database design, tSQL, and performance tuning

• Front End development experience with Angular, JavaScript, HTML/CSS

• Strong knowledge of AWS cloud services (EC2, EKS, Lambda, SQS, SNS, Glue, etc.)

• Experience with CI/CD pipelines, automation and modern DevOps practices

• Hands-on experience with unit testing and BDD frameworks (eg MSTest, tSQLt, Cucumber, Mocha)

• Strong analytical and problem-solving skills

• Experience working in Agile environments

Key Responsibilities:

Contributes and leads development through high-quality software design and architecture

Identifies, priorities, and performs tasks in the software development life cycle

Develops tools and applications by producing clean, efficient and scalable code

Advocate for and implement engineering guidelines for excellence, including automation, code reviews, continuous integration/continuous delivery (CI/CD), and performance tuning

Ensures high quality, reliable products using unit, integration and BDD test suites

Collaborates closely with business and engineering partners to deliver products, services, improvements and solutions to meet customer needs and align with goals of the business and engineering lines

Communicates with clarity, precision, and influence, presenting complex information in a clear and concise format that is appropriate for the audience

Drive a culture of engineering excellence through mentorship, peer reviews, and promoting standard methodologies in software design and development

Continuously optimize systems for performance, scalability, and security in a fast-paced, production environment

Experience & Skills:

Over 8+ years proven experience as a Software Developer, architecting, developing and testing large-scale data intensive applications in an enterprise environment

Solid Prior experience of Database modelling/design, performance tuning, and optimization

Thorough knowledge of application programming for data intensive applications on SQL Server using Stored Procedures/tSQL

Proficiency in C# .NET, including designing and implementing RESTful APIs and microservices

UI development for business-critical applications in Angular, JavaScript, HTML/CSS and other modern UI technologies

Strong understanding of AWS cloud infrastructure and native services - AWS EC2, EKS, Lambda, SQS, SNS, AWS Glue etc

Experience with unit testing frameworks (eg MSTest, tSQLt) and Behaviour-Driven Development (BDD) tools (eg Cucumber, Mocha).

Proven ability to deliver high-quality, maintainable code and systems.

Extensive experience in software engineering principles, CI/CD tools and automation processes

Strong analytical skills and a problem-solving mentality

Some experience of Business and Technical Analysis, Quality Assurance, Delivery Management, and/or Emerging Technology and Governance

Experience working in an agile environment with a focus on collaboration, automation, and continuous improvement

Experience with Financial Markets in Equities and/or Fixed Income

Prior experience with Java (including SpringBoot) and/or Python for cross-platform integrations, greenfield and Legacy systems is hugely advantageous

Familiarity with Sybase and PostgreSQL, including database management and optimization

Key Attributes:

Articulate, energetic person able to work alone or as part of a team

Excellent attention to detail but an ability to think laterally to solve business problems

Excellent interpersonal skills, both written and verbal, with the ability to work eUectively with both technical and non-technical collaborators

A passion for continuous learning and improving software engineering practices

Ability to learn quickly, work under pressure and to tight deadlines

Demonstrated ability to mentor and grow junior engineers

Creative, results driven, self-motivated and solutions oriented

Demonstrates a can-do attitude, exhibits self-confidence