.NET Engineer

Insightful Technology; Greater London; Hybrid; GBP 55,000 - 75,000; Full time

Benefits offered by this job

Performance bonuses

Travel expenses after probation

WFH on Wednesdays

Gym membership after year one

5 days Christmas leave

Eye test & glasses allowance

Job summary

Insightful Technology in London is seeking an experienced .NET/C# backend engineer to own the core product backend. You will develop, test and optimise APIs, services and integrations, ensuring high performance and security.

You will work with product and engineering teams, maintain deployments via CI/CD, and contribute to design decisions in a fast-paced environment with strong emphasis on technical excellence.

Hybrid working with Wednesday remote option and generous leave and wellness perks.

Qualifications

• Experience engineering software with C#, .NET, ASP.NET, and MS SQL Server.
• Experience building APIs, web services, and system integrations.
• Experience building and supporting event-driven distributed systems.
• Strong understanding of performance and scalability.

Responsibilities

• Develop, test and support .NET applications, APIs and integrations.
• Improve reliability, usability and business value of systems.
• Collaborate with product, engineering and other teams to translate requirements.
• Maintain system integrations between internal platforms and external services.
• Support deployment, troubleshooting and production incidents.
• Participate in code reviews and knowledge sharing.

Skills

C#

.NET

ASP.NET

SQL Server

Entity Framework

LINQ

Async programming

OOP fundamentals

Design patterns

CI/CD

Unit testing

AI coding tools

Tools

CI/CD tooling

Job description

At Insightful Technology, we build intelligent solutions that help organisations manage risk, protect data and stay compliant in an ever-changing world. Our products power global enterprises, financial institutions and regulated organisations.

If you want to be part of a team building extraordinary technical solutions in a compelling working environment where ideas move quickly, people support each other and innovation is part of everyday life, you’ll feel right at home here.

Role overview

We are looking for an experienced and highly skilled .NET / C# developer to act as the primary backend engineer for our mobile communication compliance product. The role is suited for someone with a deep understanding of backend technologies and microservice/event driven systems. You will be working closely with fellow developers, product colleagues and other stakeholders.

The engineer will build, run, maintain, optimise, and support the product’s backend systems deployed on servers in our own datacentres. They will take ownership of the performance, security, and evolution of the core technical functionality of the product. Success will be defined by a stable and performant product: minimal downtime, fast recovery, predictable performance, high stakeholder confidence, and the ability to adapt to incoming product and business requirements in a fast-paced environment.

This role would suit a driven problem-solver who combines strong technical judgement with curiosity, pragmatism and a genuine commitment to technical excellence.

Key responsibilities

• Develop, enhance, test and support .NET-based applications, APIs and integrations.
• Work on customer-facing, operational and internal systems, helping to improve reliability, usability and business value.
• Collaborate with product, engineering and other teams within the business to understand requirements and translate them into workable technical solutions.
• Build and maintain system integrations between internal platforms and external communications platforms or services.
• Support the ongoing improvement and maintenance of existing applications, including troubleshooting defects, performance issues and production incidents.
• Contribute to technical design decisions, ensuring solutions are secure, supportable and aligned to good engineering practice.
• Write clean, maintainable code and follow agreed standards for version control, testing, deployment and documentation.
• Participate in code reviews, peer support and knowledge sharing within the team.
• Assist with release activity, deployment processes and post-release support where required.
• Work with Git and CI/CD tooling to support structured software delivery.
• Contribute to a collaborative, delivery-focused team culture and support continuous improvement in the way they develop and support software.
• In addition to the duties listed above, the jobholder is expected to perform other ad-hoc duties assigned by the Head of Engineering and/or the Lead Engineer from time to time.
• All colleagues are encouraged to take responsibility for personal development initiatives within the scope of their role, and to encourage the development of others.

Required experience and skills

Mandatory

• Experience engineering software using C#, .NET, ASP.NET, and Microsoft SQL Server.
• Experience building APIs, web services, and system integrations.
• Experience building and supporting event-driven distributed systems.
• Experience with relational databases and large data volumes.
• Experience engineering software systems from a performance and high-throughput perspective.
• Excellent understanding of C# version 12, .NET version 8, preferably their more recent versions.
• Excellent understanding of Entity Framework Core, LINQ, and collections.
• Excellent understanding of ASP.NET, associated concepts, error handling, and request lifecycle.
• Excellent understanding of asynchronous programming, generics, data types, and memory management in C#.
• Excellent understanding of object-oriented programming and software engineering fundamentals.
• Very good understanding of complexity, performance, and scalability of software systems.
• Very good understanding of enterprise design patterns and modern enterprise architecture patterns.
• Good understanding of process-related concepts such as tasks, threads, processes, and concurrency.
• Good understanding of relational databases, database fundamentals, performance aspects, and indexes, ideally Microsoft SQL Server.
• Good understanding of unit testing and associated technologies.
• Experience leveraging AI as a coding tool and AI agents to accelerate the software engineering process.
• Experience working in a fast-paced, continuously evolving, and challenging environment.
• Understanding of software testing, particularly test automation and relevant technologies.
• Understanding of CI / CD concepts, pipelines, relevant systems and technologies.
• Two performance-based bonuses per annum
• Travel expenses once the probation period is over
• Option to WFH on Wednesdays
• Free gym membership after year one
• +5 days Christmas leave
• Eye test and glasses allowance

Job details

• Location: London, UK, in-office
• Employment type: Full-time, permanent
• Experience: 7–10 years
• Salary: £55000–£75000 per year, depending on experience
• Reports to: Lead Engineer
• We are only accepting applications from within the United Kingdom.