Senior Developer (C# / .Net)

Full-time

Contract Type: Long term contract

About the Position

We are seeking a Senior Developer (C# /.Net) to join our team in Spain, specializing in robust software solutions for electronic trading and pricing workflows. This role offers a compelling chance to help build a brand-new greenfield platform in the fixed income electronic trading space, developed on AWS and current.NET technologies, where engineering excellence, reliability, and production-ready delivery are central.

Responsibilities

• Architect, develop, and maintain reliable.NET software components throughout every stage of the delivery lifecycle.
• Assume direct, hands-on ownership of technically demanding platform components, keeping them resilient, maintainable, scalable, and properly documented.
• Exercise sound engineering judgment across architecture, design, implementation, testing, and operational concerns.
• Collaborate closely with trading, product, architecture, infrastructure, and partner technology teams so that delivered solutions match business priorities.
• Help strengthen engineering standards, including test automation, observability, secure coding, CI/CD, and sound release management.

Requirements

• Expert command of C# and .NET/.NET Core, underpinned by a firm grasp of object-oriented design, SOLID principles, and clean architecture.
• Substantial background designing, developing, and supporting ASP.NET Core Web APIs and RESTful services running in production.
• Advanced knowledge of multi-threading, asynchronous programming, performance optimization, and distributed system design.
• Demonstrated experience across SQL and NoSQL databases, covering data modeling, performance factors, and operational support.
• Practical exposure to containerization technologies such as Docker, along with current deployment approaches.
• Solid track record designing and delivering API-driven service-oriented or microservice architectures.
• Rigorous approach to automated testing, spanning unit, integration, and behavior-driven testing with tools such as NUnit, Moq, and Cucumber.
• Wide-ranging experience with messaging and event-driven architectures based on technologies like RabbitMQ, TIBCO, SignalR, or comparable platforms.
• Considerable experience with continuous integration, continuous delivery, and version control tooling such as Git, TeamCity, or equivalent.
• Real-world experience working within Agile delivery teams and helping refine the software lifecycle.
• Background supporting live production systems, troubleshooting incidents, and enhancing reliability, monitoring, and operational readiness.
• Advanced English (required). Spanish is a plus.

We Offer

• Full-time and permanent employment contract or contractor mode.
• Remote location in Spain (other EU or LATAM countries will be taken into account).
• Professional growth possibilities & learning opportunities.
• Possibility to join a multicultural team & work in the international environment.
• Variety of benefits to support your physical, emotional, and financial wellbeing: private medical insurance, life insurance, lunch and transport card as part of the flexible remuneration pack, and online language classes.
• Smart Office Pack.

About the Company

Talan – Positive Innovation

Talan is an international consulting group specializing in innovation and business transformation through technology. With over 7,200 consultants in 21 countries and a turnover of €850M, we are committed to delivering impactful, future-ready solutions.

Talan at a Glance

Headquartered in Paris and operating globally, Talan combines technology, innovation, and empowerment to deliver measurable results for our clients. Over the past 22 years, we’ve built a strong presence in the IT and consulting landscape, and we’re on track to reach €1 billion in revenue this year.

Our Core Areas of Expertise

• Data & Technologies: We design and implement large-scale, end-to-end architecture and data solutions, including data integration, data science, visualization, Big Data, AI, and Generative AI.
• Cloud & Application Services: We integrate leading platforms such as SAP, Salesforce, Oracle, Microsoft, AWS, and IBM Maximo, helping clients transition to the cloud and improve operational efficiency.
• Management & Innovation Consulting: We lead business and digital transformation initiatives through project and change management best practices (PM, PMO, Agile, Scrum, Product Ownership), and support domains such as Supply Chain, Cybersecurity, and ESG/Low-Carbon strategies.

We work with major global clients across diverse sectors, including Transport & Logistics, Financial Services, Energy & Utilities, Retail, and Media & Telecommunications.

If you are passionate about data, development & tech, we want to meet you!

Talan Spain’s commitment to non-discrimination based on gender, race, ideology, or any other reason, in accordance with the company’s "Equality Plan" and the current regulations on gender equality between women and men (Royal Decree-Law 6/2019).

I'm interested

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Posted by

Lucas Rosso

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