Senior .NET Developer - Azure DevOps - Financial Services

Rothstein Recruitment; Greater London; On-site; GBP 65,000 - 90,000; Full time

Job summary

Rothstein Recruitment seeks a Senior Developer for a well-established Financial Services organisation in Greater London. You will design and build features across the full stack using .NET and C#, collaborating with product owners and stakeholders to deliver robust software.

You will own CI/CD pipelines, embrace DevOps practices, and focus on observability and reliability in Azure-hosted environments. The role blends hands-on coding with leadership and a product-minded, data-driven approach.

Qualifications

• Hands-on, full-stack development across frontend and backend.

Responsibilities

• Design and build features across front and back end throughout the development lifecycle.
• Designing, building, deploying, and supporting software across front and backend stacks.
• Building and maintaining CI/CD pipelines for Azure hosted solutions.
• Instrument services with observability to monitor health and releases.
• Operate live services including release management and incident response.
• Take part in learning paths; contribute to operations and SRE practices.
• Product-minded approach: focus on customer outcomes and data-informed decisions.

Skills

C#

NET stack

Frontend development

Backend development

CI/CD pipelines

DevOps practices

Observability

Site Reliability Engineering

Infrastructure as Code

GitHub Actions

Octopus Deploy

SOLID principles

Clean code

UX

Azure Monitor

OpenTelemetry

Tools

GitHub Actions

Octopus Deploy

Azure Monitor

Application Insights

Datadog

Grafana

Prometheus

OpenTelemetry

Job description

Excellent opportunity opens to join an established Financial Services Organisation as their new Senior Developer. With a strong foundation in .NET and C#, you will be essential to the designing and building of features across the stack, as well as act as a visible figure within the firm engaging multiple stakeholders.

Duties/Responsibilities

• Design and build product features across the front and back end, engaging fully in the development lifecycle of applications and tools and contributing hands-on to all development tasks, from coding to reviewing and releasing to production. Collaborate closely with team members, product owners, and stakeholders.
• Designing, building, deploying, and supporting software across front and backend stacks
• Building and maintaining automated CI/CD pipelines and test automation to facilitate a seamless, repeatable route to production for Azure hosted solutions
• Operating and supporting environments up to and including production, instrumenting services with meaningful observability so we can trust our releases and respond quickly when something goes wrong
• Live the "you build it, you run it" model. Implement and refine DevOps practices, building and owning CI/CD pipelines, managing infrastructure as code, and instrumenting services with observability (metrics, logs, and traces) so their health is visible. Take part in operating live services, including release management, alerting, and incident response, while actively reducing toil, technical debt, and manual effort through automation.
• Take ownership of personal learning paths, continually acquiring new skills, particularly across operations, SRE, and observability, to enhance team solutions and individual performance.
• You will also have a product mindset: you care about customer outcomes, and you want to make data-informed decisions.

Skills, Knowledge, and Experience

• You are a capable, hands-on software developer who enjoys designing and building product features across the front and back end. The operations and SRE focus in this role is something you bring in addition to strong development skills, not instead of them, and you should be equally happy shipping product features as you are improving how we run them.
• You have developed modern component-oriented front end applications using frameworks and libraries and have a good appreciation of UX (User eXperience).
• Solid working knowledge of C# and the .NET stack. Our current tech stack is primarily Microsoft / Azure focused; C# is our primary language.
• Advocate of key principles such as SOLID and CLEAN code, applying to all areas of development. Keen to write code that is self-explanatory and easy to maintain.
• You have a sound grasp of modern engineering principles and prefer working in small iterations that optimise feedback. You like to validate hypotheses via experiments.
• Alongside your development work, a genuine interest in operations and Site Reliability Engineering, and you care about how services actually behave in production, not just whether they pass their tests.
• Experience (or a strong desire to grow) building and maintaining CI/CD pipelines and automating the path to production. We use GitHub Actions and Octopus Deploy, but an understanding of the principles behind CI/CD is more important than the specific tooling you have used. You will have worked in an environment that deploys regularly to production.
• An appreciation of observability, using metrics, logs, and traces (for example Azure Monitor / Application Insights, Datadog, Grafana/Prometheus, or OpenTelemetry) to understand system health, and an interest in SLIs/SLOs and alerting.
• Comfort with, or enthusiasm to learn, Infrastructure as Code to provision and manage environments in a repeatable, reviewable way.
• A willingness to take part in operational duties such as releases, incident response, and keeping live services healthy and reliable.

Nice to have

• Experience with Okta (or a comparable identity and access management platform, such as Microsoft Entra ID) for authentication and authorisation.
• Hands-on experience with Terraform for Infrastructure as Code.