Senior .Net Developer

Isio; Manchester; Híbrido; GBP 90.000 - 130.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Hybrid work model

Career development

Equal opportunities employer

Descripción de la vacante

Isio is seeking a senior backend developer to design and build backend services for our investment technology platform. You’ll own features end-to-end, shaping requirements, implementing REST/GraphQL APIs with C#, .NET, and ASP.NET Core, and ensuring reliable, secure production systems.

You’ll collaborate with product and engineering peers, drive architectural decisions, and contribute to testing, logging, metrics and tracing to deliver observable, maintainable services.

Formación

• Strong C# and .NET experience with production applications using ASP.NET Core.
• Solid understanding of asynchronous programming, multithreading and concurrency.
• Experience with asynchronous messaging, retries, idempotency and error handling.
• Strong relational database fundamentals (PostgreSQL, SQL Server) and SQL proficiency.
• Experience with Docker and cloud environments (AWS or Azure).
• Familiarity with Kubernetes, CI/CD, and infrastructure as code tools (Terraform/Helm).
• Knowledge of security, testing, observability, logging, and tracing in distributed systems.
• Excellent communication and ability to translate requirements into technical solutions.

Responsabilidades

• Own backend features and services from design to production support.
• Design and develop REST and GraphQL APIs, background processing, and integrations.
• Build reliable asynchronous workflows with correct retries and data consistency.
• Model relational data with scalable schemas and efficient access patterns.
• Define API contracts and safe database deployments with backwards compatibility.
• Incorporate testing, logging, metrics, and tracing for reliability.
• Contribute to code reviews and mentor other developers.
• Ensure security and proper access control across services.

Conocimientos

C#

.NET

ASP.NET Core

REST APIs

GraphQL

Asynchronous programming

Multithreading

SQL

PostgreSQL

SQL Server

Docker

AWS

Azure

Kubernetes

Terraform

Helm

Linux

CI/CD

Testing

Observability

Security

Git

Educación

Bachelor’s degree in Computer Science or related field

Herramientas

Docker

Kubernetes

Terraform

Helm

Git

PostgreSQL

SQL Server

Descripción del empleo

We’re looking for a senior developer to design and build backend services for our investment technology platform, supporting portfolio management, financial analytics, reporting and integrations. This is a hands-on engineering role with ownership from design through to production.

You’ll work closely with product stakeholders and other engineers, contribute to architectural decisions and build software with reliability, security and maintainability at its core.

This is an exciting time to join as we continue to invest in and develop our technology offering following the acquisition of AI-driven investment manager Collidr.

What does the role entail

• Own backend features and services throughout their lifecycle, from shaping requirements and designing solutions to implementation, testing, deployment and production support.
• Design and develop REST and GraphQL APIs, background processing and integrations using C#, .NET and ASP.NET Core.
• Build reliable asynchronous workflows, accounting for message delivery, retries, idempotency and data consistency.
• Design and develop relational data models and data access patterns with performance, scalability and efficient resource use in mind.
• Design API contracts and database schema changes with backwards compatibility and safe deployment in mind.
• Build automated testing, structured logging, metrics and tracing into services to support reliable delivery and visibility into production behaviour.
• Make well-reasoned technical decisions that meet business requirements and uphold high standards of reliability, security, performance and maintainability.
• Contribute to code reviews, share knowledge and mentor other developers.

What we’re looking for

• Strong C# and .NET experience: You have built and maintained production applications using ASP.NET Core, including designing and developing REST and GraphQL APIs.
• A solid understanding of asynchronous programming, multithreading and concurrency: You can write efficient, thread-safe code and reason about shared state, cancellation, synchronisation and resource management.
• Experience with asynchronous messaging: You understand message delivery guarantees, retries, idempotency and error handling.
• Strong relational database fundamentals: You have worked with PostgreSQL, Microsoft SQL Server or similar databases and are comfortable with SQL, schema design, indexing, transactions and query performance.
• Experience with Docker and cloud environments: You understand how backend applications are packaged, configured, deployed and supported on a cloud platform such as AWS or Azure.
• Strong software engineering practices: You write clean, maintainable code and consistently apply principles including KISS, DRY and SOLID, alongside defensive programming, meaningful validation and robust error handling.
• Good testing and observability practices: You write useful unit and integration tests and use structured logging, metrics and distributed tracing to understand application behaviour and support production services.
• An understanding of application security: You design services with authentication, authorisation and secure handling of sensitive data in mind.
• Experience with version control systems such as Git: You are comfortable with branching, pull requests and collaborative code review.
• Ownership and clear communication: You can translate business requirements into well-designed technical solutions, explain trade-offs and work effectively with technical and non-technical colleagues.
• Strong familiarity with AWS and Kubernetes.
• Experience with Helm and infrastructure as code tooling such as Terraform.
• Experience designing or working with modular monoliths and distributed systems.
• Experience building financial systems, investment platforms or related applications.
• Familiarity with Linux environments.
• Experience with CI/CD pipelines and automated deployment processes.
• Experience with caching strategies, including cache invalidation and consistency.

Why Join Isio

Isio is a fast-growing professional services business, that offers career development through an evolving client base, diverse and meaningful work, nationwide opportunities, and a culture that rewards high performance and accountability.

We hold ourselves to the highest standards and our values guide how we advise our clients, how we operate as a business and how we work together as a team. We call it the Isio Attitude. We encourage our people to be bold, to communicate with conviction, and to deliver advice that matters.

You can find out more about Isio and the benefits we offer on our career's website Isio - Careers & Benefits.

About Isio

A progressive advisory firm, partnering with clients of all sizes to deliver expertise in pensions, employee benefits and wealth advisory services.

Working with pension trustees, employers, individuals, families and their offices, we are supported by talented colleagues across 10 UK offices. With a Big 4 heritage we combine a strong focus on quality with a fresh perspective challenging traditional thinking.

Our culture shapes our work; we foster a supportive environment where we develop our people to grow and fulfil their potential. We invest in our services, products and technology, and provide clear, expert solutions for our clients. This brings clarity, confidence, and better outcomes for everyone.

At Isio, we are committed to fostering an inclusive, equitable and diverse workplace, in which our colleagues feel they belong, regardless of background or difference. We uphold the values of respect, fairness, and inclusion in our actions and decisions. We believe that by adhering to these principles, we will create a stronger, more innovative, and supportive environment for all, as well as ensuring that the advice and support we provide to our clients is more creative, more insightful and leaves a lasting impact.

We can offer a hybrid, flexible approach to work, supporting a work-life balance that works for you. Isio Group is an equal opportunities employer, and we welcome applications from all suitably qualified candidates.

If you think you may require a reasonable adjustment to be made for any reason at any stage of your recruitment process, please ask us [e-mail]