Senior Dotnet Developer

CompanyHalian | Managed Services, Recruitment Agency & Contract Staffing

LocationLondon Area, United Kingdom

Posted At1/16/2026

UK Visa Sponsorship Analytics

Occupation Type

Programmers and software development professionals

Occupation Code Skill LevelHigher Skilled

Sponsorship Salary Threshold

£54,700 (£28.05 per hour)

Occupation rate applies

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Description

Senior Backend Engineer (.NET Core) – Fintech / Payments

We are looking for an experienced Senior Backend Engineer to join an engineering team building secure, scalable systems within the fintech space. This role is suited to a backend specialist with strong .NET Core experience who enjoys working on complex, high-throughput platforms where performance, reliability, and security are essential.

You will contribute to the design and evolution of backend services, work on distributed systems, and help maintain high engineering standards across the team.

Key Responsibilities

Design, develop, and maintain secure, high-performance backend services using .NET Core
Build, evolve, and maintain RESTful APIs
Contribute to microservices-based and distributed system architectures
Work across both greenfield and existing systems with a focus on scalability and maintainability
Participate in technical design discussions and influence engineering best practices
Optimise database performance, queries, and data access patterns
Identify and resolve performance and reliability issues

Collaborate closely with product, frontend, and QA teams in an Agile environment

Participate in code reviews and support continuous improvement

Skills & Experience

Strong commercial experience as a Senior Backend Engineer using .NET Core
Proven experience building scalable backend systems in production environments
Experience designing secure, high-performance RESTful APIs
Solid understanding of distributed and asynchronous backend systems
Experience working with cloud platforms such as AWS or Azure
Strong SQL Server experience, including query and performance optimisation
Experience with ORMs such as Entity Framework Core or Dapper
Exposure to message-based or event-driven systems (e.g. RabbitMQ, Kafka)
Experience with automated testing frameworks (e.g. xUnit, NUnit)
Comfortable working in Agile delivery environments
Strong problem-solving and communication skills

Nice to Have

Experience working in the payments or broader fintech domain

Exposure to highly regulated or high-availability systems

Mentor junior and mid-level engineers

Location & Working Pattern

Central London office
Hybrid working: 3 days per week on-site

There is a 2 - 3 stage interview process with interview slots now available.

Apply now to be considered.