Job Description:

Senior .NET Developer

Who We Are:

Born digital, UST transforms lives through the power of technology. We walk alongside our clients and partners, embedding innovation and agility into everything they do. We help them create transformative experiences and human-centered solutions for a better world.

UST is a mission-driven group of 29,000+ practical problem solvers and creative thinkers in more than 30 countries. Our entrepreneurial teams are empowered to innovate, act nimbly, and create a lasting and sustainable impact for our clients, their customers, and the communities in which we live.

With us, you’ll create a boundless impact that transforms your career—and the lives of people across the world.

Visit us at UST.com.

You Are:

UST is searching for a hands-on Senior .NET Developer who can turn ambiguous business or technical problems into practical, production-ready solutions. The successful candidate will work independently, collaborate effectively with product, architecture, quality, security, and operations partners, and take ownership from discovery and design through implementation, release, and production support.

The opportunity:

· Take unclear or incomplete requirements, identify the real problem, surface assumptions and risks, and propose a practical path forward.

· Own solution delivery end to end, including discovery, technical analysis, design, implementation, testing, deployment, observability, and production follow-through.

· Design, build, and maintain reliable backend services and web APIs using C#, modern .NET, ASP.NET Core, REST, JSON, and established engineering practices.

· Evaluate solution options and explain trade-offs across architecture, performance, scalability, security, operability, delivery effort, and long-term maintainability.

· Create focused proofs of concept when they reduce uncertainty, then convert validated approaches into supportable production solutions.

· Apply SOLID principles, object-oriented design, design patterns, clean code practices, and appropriate modern architecture patterns without over-engineering.

· Write and maintain automated unit and integration tests, contribute to quality gates, and partner with QA to cover negative, boundary, and regression scenarios.

· Perform constructive code reviews, challenge weak assumptions, voice technical or delivery concerns early, and help the team resolve issues transparently.

· Troubleshoot complex defects and production incidents using logs, traces, metrics, database analysis, and structured root-cause investigation.

· Improve existing systems through refactoring, performance tuning, technical-debt reduction, secure coding, and better documentation.

This position description identifies the responsibilities and tasks typically associated with the performance of the position. Other relevant essential functions may be required.

What you need:

· Good experience working with Queues (Service Bus preferred).

· 5+ years of professional software development experience, with strong recent hands-on experience in C# and modern .NET/.NET Core.





· Demonstrated experience designing and developing web-based backend applications and RESTful APIs.

· Proven experience working with Microservices Architecture.

· Strong knowledge of object-oriented design, SOLID principles, clean code, design patterns, dependency injection, asynchronous programming, and exception handling.

· Experience with SQL Server or comparable relational databases, including data modeling, T-SQL, query optimization, transactions, and troubleshooting.

· Experience with ORM technologies such as Entity Framework and with API contracts using JSON and common web-service standards.

· Practical experience with automated unit and integration testing and with testable application design.

· Working knowledge of source control, pull requests, code reviews, CI/CD pipelines, and disciplined release practices.

· Ability to reason about modern distributed-system patterns such as microservices, service-oriented architecture, domain-driven design, asynchronous messaging, event-driven design, and CQRS, choosing them only when appropriate.

· Strong troubleshooting and production-support capability, including log and stack-trace analysis, root-cause analysis, and permanent remediation.

· Ability to work independently, communicate clearly with technical and non-technical stakeholders, raise concerns constructively, and follow solutions through to production.

· Practical experience using AI-assisted development tools within a professional SDLC, with evidence of validation, security awareness, and measurable engineering value.

· Bachelor’s degree in Computer Science, Computer Engineering, or a related discipline, or equivalent professional experience.

· AI-Enabled SDLC Expectations

· The candidate should be able to use approved AI tools efficiently across the SDLC while preserving engineering judgment and accountability.

· Use GitHub Copilot, Claude, or comparable approved tools to accelerate code exploration, implementation scaffolding, refactoring, test generation, debugging, documentation, and design analysis.

· Preferred, Not Required

· Azure or other cloud-platform exposure is a plus, not a prerequisite.

· Exposure or understanding to Azure services, cloud-native architectures, containers, messaging services, monitoring, or infrastructure-as-code tools.

Benefits

Employees receive mandatory and non-mandatory benefits such as fourteen (14) days of vacation beginning on the date of hire, vacation premium, ten (10) paid holidays, a Christmas Bonus of thirty (30) days’ pay, Monthly Food Vouchers, Saving Fund, and health insurance. Certain employees may be eligible for additional Company benefits beginning on the date of hire, including dental, disability and life insurance plans; four (4) days of personal time off per year, up to three (3) days of paid medical leave per year, and up to three (3)



days of paid bereavement leave per year.

What we believe:

We proudly embrace the values that have shaped UST since day one. We build our culture of Humility, Humanity, and Integrity. These values inspire us to nurture a people-first, human centric culture that fosters diversity, prioritizes sustainable solutions, and keeps our people and clients at the forefront of all decisions.

Humility:

We will listen, learn, be empathetic and help selflessly in our interactions with everyone.

Humanity:

Through business, we will better the lives of those less fortunate than ourselves.

Integrity:

We honor our commitments and act with responsibility in all our relationships.

An Equal Opportunity Workplace, Free of Discrimination and Harassment

At UST, we strive to provide a work environment free of discrimination and harassment. We are an equal opportunity employer and employment decisions are based on merit and business needs. Our Human Rights Policy further illustrates our stand on this. We are committed to following fair employment practices that provide equal opportunities to all employees. We do not discriminate or allow harassment on the basis of race, color, religion, disability, gender, national origin, sexual orientation, gender identity, gender expression, age, genetic information, military status, or any other legally protected status. At UST, we value diversity and believe that a diverse workplace builds a competitive advantage.

Un lugar de trabajo con igualdad de oportunidades y libre de discriminación y acoso

En UST, nos esforzamos por proporcionar un ambiente de trabajo libre de discriminación y acoso. Somos un empleador que ofrece igualdad de oportunidades y basa las decisiones de empleo en los méritos y las necesidades del negocio. Estamos comprometidos a seguir prácticas de empleo justas que brinden igualdad de oportunidades a todos los empleados. No discriminamos ni permitimos el acoso por motivos de raza, color, religión, discapacidad, género, origen nacional, orientación sexual, identidad de género, expresión de género, edad, información genética, estado militar o cualquier otro estado legalmente protegido. En UST, valoramos la diversidad y creemos que un lugar de trabajo diverso construye una ventaja competitiva.

UST reserves the right to periodically redefine your roles and responsibilities based on the requirements of the organization and/or your performance.

#UST

#LI-NF1

#LI-Remote

Skills:

.NET, Design Patterns, Microsoft SQL Server, Microservices, Azure Service Bus, CI/CD, GitHub Copilot, REST, Unit Testing, JSON, CQRS

About Company:

UST is a general digital transformation solutions provider. For more than 20 years, UST has worked side by side with the world’s best companies to make a real impact through transformation. Powered by technology, inspired by people and led by purpose, UST partners with their clients from design to operation. With deep domain expertise and a future-proof philosophy, UST embeds innovation and agility into their clients’ organizations. With over 30,000 employees in 30 countries, UST builds for boundless impact—touching billions of lives in the process.

📌 Senior .NET Developer (Guadalajara)
🏢 Ust
📍 Guadalajara