Senior .NET Developer (Multiple Roles)

Ocho People; Belfast City District; Hybrid; GBP 39,000 - 65,000; Full time

Benefits offered by this job

25 days annual leave

Pension contribution

Annual bonus scheme

AWS certification support

Job summary

Ocho People in Belfast seeks a Senior .NET Developer to join a hybrid team. You will work three days per week in the office on a major trading platform upgrade, using C#, .NET Core and SQL Server, and evolving microservices. You will gain hands-on AWS exposure as the platform migrates.

You will collaborate with senior engineers and product teams, delivering robust high-performance systems for global markets and benefiting from a strong engineering culture and career progression.

Qualifications

• 5+ years of professional .NET development experience.
• Strong experience with C# and .NET Core.
• Solid experience with SQL Server and relational database design.
• Experience building and maintaining microservices architectures.
• Based in or able to commute to Belfast for hybrid working, three days per week in the office.

Responsibilities

• Lead development of core components within the trading platform upgrade programme.
• Design and build scalable, high performance services using C#, .NET Core and SQL Server.
• Architect microservices that support real time trading workflows.
• Drive adoption of AWS services as part of the platform's cloud migration.
• Mentor junior and mid level developers across the team.
• Collaborate with architects to define technical standards and best practice.
• Review code and champion quality across the development lifecycle.
• Partner with QA and DevOps to improve deployment pipelines and system reliability.
• Troubleshoot and resolve complex production issues within trading systems.
• Contribute to sprint planning and technical roadmap discussions.

Skills

C#

.NET Core

Microservices

SQL Server

AWS exposure

Tools

SQL Server

Job description

Senior .NET Developer

• Senior .NET Developer, Belfast, hybrid working with three days per week in the office
• Salary up to £65,000 depending on experience
• Join a major upgrade of a trading platform, working with C#, .NET Core, SQL Server and microservices
• Genuine hands on exposure to AWS, with support towards AWS certifications
• Work for a global markets and financial services business investing heavily in its technology estate

About the Company

Our client is a global markets infrastructure and financial services business, providing trading, technology and data solutions to institutions worldwide. With a substantial international footprint and decades of expertise in financial markets, the business is investing heavily in its technology estate, including a major upgrade of its core trading platform. It is a stable, well regarded employer with a strong track record of developing engineers technically and supporting career progression.

The Role

This is a rare opportunity to join a senior engineering team at the centre of a major trading platform upgrade, working with modern .NET technologies and cloud infrastructure. You will operate with real autonomy, contributing to architecture decisions alongside experienced engineers and stakeholders across the business. The role suits a developer who enjoys solving complex problems in high performance, low latency systems and wants genuine exposure to AWS as the platform modernises. You will collaborate closely with fellow senior developers, architects and product teams to deliver a platform used across global markets.

Key Responsibilities

• Lead development of core components within the trading platform upgrade programme
• Design and build scalable, high performance services using C#, .NET Core and SQL Server
• Architect microservices that support real time trading workflows
• Drive adoption of AWS services as part of the platform's cloud migration
• Mentor junior and mid level developers across the team
• Collaborate with architects to define technical standards and best practice
• Review code and champion quality across the development lifecycle
• Partner with QA and DevOps to improve deployment pipelines and system reliability
• Troubleshoot and resolve complex production issues within trading systems
• Contribute to sprint planning and technical roadmap discussions

What You'll Need

Essential:

• 5+ years of professional .NET development experience
• Strong commercial experience with C# and .NET Core
• Solid experience with SQL Server and relational database design
• Experience building and maintaining microservices architectures
• Based in or able to commute to Belfast for hybrid working, three days per week in the office

Desirable / Nice to Have:

• Exposure to AWS or another major cloud platform
• Experience within trading, exchange or financial markets technology
• Interest in pursuing AWS certifications

Why Apply?

• Salary up to £65,000 depending on experience
• Hybrid working, three days per week in the Belfast office
• 25 days annual leave plus bank holidays
• Pension contribution and annual bonus scheme
• Direct exposure to AWS, with the business actively supporting AWS certifications
• Join a genuinely large scale trading platform upgrade, not routine maintenance work
• Work alongside experienced engineers in a senior, high trust team
• Clear path for technical growth within a stable, global business