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Concord Servicing

Senior Software Engineer, .NET

Concord Servicing

. Design, build and maintain applications and APIs in C# on .NET, including ASP.NET Core, Web API and background services .

Posted 10/25/2026full-timeMexico City • MexicoSeniorWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in designing and maintaining applications and APIs using C# and .NET, with a strong focus on security practices and regulatory compliance. Proven ability to lead technical design, mentor engineers, and collaborate across teams to deliver robust software solutions.

Highest-signal resume keywords
C# DevelopmentASP.NET CoreREST APIsSQL ServerAutomated Testing

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
C#ASP.NET CoreWeb APIEntity FrameworkDapperSQL ServerAutomated TestingDependency InjectionHTMLCSS
Soft Skills
Technical CommunicationProblem SolvingMentoring
Tools & Technologies
GitCI/CD PipelinesAgileScrum
Industry Keywords
Data RetentionAccess ControlsSecurity PracticesFinancial Data Protection

Tech Stack

Tools & technologies
ASP.NETEntity FrameworkJavaScriptSQL.NET

About the role

Key responsibilities & impact
  • Design, build and maintain applications and APIs in C# on .NET, including ASP.NET Core, Web API and background services
  • Write testable, well-documented code and review peers' work against agreed standards
  • Lead technical design for multi-component features and mentor other engineers
  • Build and maintain integrations with internal and third-party systems through APIs and messaging
  • Own features end to end: refine requirements, estimate, build, test, deploy and support in production
  • Collaborate with Product, Compliance, Security and Data teams to translate business and regulatory requirements into technical solutions
  • Implement security practices protecting sensitive financial data, including encryption, authentication and authorization
  • Apply regulatory and audit requirements such as data retention and access controls
  • Troubleshoot production issues, identify root causes and fix underlying problems
  • Monitor security trends and emerging technologies and recommend worthwhile adoption

Requirements

What you’ll need
  • Bachelor's degree in Computer Science or a related field, or equivalent experience
  • 7+ years of professional software development, with C# and .NET as your primary stack
  • Hands-on experience with ASP.NET Core, REST APIs, Entity Framework or Dapper, and dependency injection
  • Strong SQL Server skills, including database design, query tuning and indexing
  • Experience with automated testing (xUnit, NUnit or similar)
  • Experience with Git, CI/CD pipelines, and Agile/Scrum methodologies
  • Working knowledge of HTML, CSS and JavaScript
  • Ability to explain a technical trade-off to a non-technical audience and turn business rules into working software
  • A track record of diagnosing and fixing hard problems in production systems, with careful attention to data accuracy
  • Fluent English

Benefits

Comp & perks
  • Grocery Vouchers
  • Internet Bonus
  • Medical Insurance
  • Life Insurance
  • Dental Insurance
  • Law Benefits