Senior .NET Platform Engineer - Greenfield AWS Trading

Templeton & Partners - Innovative & Inclusive Hiring Solutions; Madrid; On-site; EUR 60,000 - 90,000; Full time

Job summary

Templeton & Partners is seeking a senior .NET developer to lead hands-on design and delivery of high-quality software for electronic trading and pricing workflows in Madrid. The role focuses on a greenfield fixed income solution on AWS and modern .NET tech, with emphasis on reliability and production-grade delivery.

You will own complex platform components, mentor teams, and contribute to testing, observability, and secure coding, collaborating with trading, product and infrastructure partners

Qualifications

• Expert-level C# and .NET/.NET Core experience.
• Strong experience designing, building and supporting ASP.NET Core Web APIs and RESTful services.
• Advanced understanding of multi-threading, asynchronous programming, performance tuning and distributed system design.
• Proven experience with SQL and NoSQL databases.
• Hands-on experience with Docker and modern deployment patterns.
• Strong experience delivering API-based service-oriented or microservice architectures.
• Automated testing across unit, integration and behavioural levels.
• Experience with messaging and event-driven architectures (RabbitMQ, TIBCO, SignalR).
• CI/CD and source control tooling (Git, TeamCity).
• Agile delivery experience and production reliability focus.
• Experience supporting production systems and incident diagnosis.

Responsibilities

• Design, build and maintain high-quality .NET software components across the full software delivery lifecycle.
• Take hands-on ownership of technically complex platform components, ensuring they are robust and well documented.
• Apply strong engineering judgement to architecture, design, implementation, testing and operations.
• Work closely with trading, product, architecture, infra and partner teams to deliver solutions aligned to business priorities.
• Contribute to strong engineering practices including automated testing, observability, secure coding, CI/CD and release management.

Skills

C# / .NET

ASP.NET Core API

Multi-threading

Asynchronous programming

Distributed systems

SQL / NoSQL

Docker

Microservices

Automated testing

RabbitMQ / Event-driven

CI/CD / Git

Agile

Production support

Fixed Income

AWS

Observability / IaC

Tools

Git

TeamCity

Job description

Templeton & Partners is seeking a senior .NET developer to lead hands-on design and delivery of high-quality software for electronic trading and pricing workflows in Madrid. The role focuses on a greenfield fixed income solution on AWS and modern .NET tech, with emphasis on reliability and production-grade delivery.

You will own complex platform components, mentor teams, and contribute to testing, observability, and secure coding, collaborating with trading, product and infrastructure partners