Software Engineer:: .NET C# in Guadalajara MX / Hybrid

Guadalajara MX / Hybrid

Long Term contract

Responsibilities

Build & Deliver Integrations

● Build integration features, RESTful APIs, and shared libraries against defined contracts and patterns, contributing to the event-driven and asynchronous flows the team builds

● Contribute directly to integration logic in the existing product code, including the monolithic application, to help clear the current backlog

● Move between modern .NET services and older .NET Framework code, debug across service boundaries, and help diagnose failures in integration flows

● Follow established API standards for versioning, contracts, and deprecation

● Take a well-scoped design or task and drive it to a working, deployed result with guidance from senior engineers

Own Your Work

● Fully test your own work before it moves forward; write unit and integration tests and contribute to acceptance and end-to-end coverage for what you build

● Own your work through every stage of the SDLC to Production, and fix Production issues that arise from it

● Meet the team's quality and coverage bar before code goes to review

● If you build it, it is your responsibility to make sure it works correctly

Use AI Across the SDLC

● Use modern AI coding harnesses daily, such as Claude Code, Codex, OpenCode, or Pi, with a working understanding of what an agent is: a model paired with a harness

● Apply these tools across the SDLC, from writing and reviewing code to generating tests

Work Within the Team

● Take day-to-day direction from the Platform Integrations manager, senior engineers, and architects, and build to the contracts, patterns, and review standards that support the team's architectural direction

● Participate in code review, both submitting your work and giving feedback on peers' integration code

● Flag integration risks, blockers,



and design gaps early rather than working around them silently

● Document the work you deliver for long-term knowledge preservation

● Maintain a working-hours overlap with US Central Time sufficient for daily standups, code review, and real-time collaboration

Qualifications: Knowledge, Skills, and Abilities

Required

● 3+ years of professional software engineering experience building production systems

● Proficiency in C# and the .NET ecosystem, including exposure to .NET Framework codebases

● Experience building or contributing to production APIs and integration features

● Experience working in large, established codebases

● Daily hands-on use of modern AI coding harnesses (Claude Code, Codex, OpenCode, Pi, or similar), with a working understanding of what an agent is (model plus harness)

● Experience writing unit and integration tests, including using AI to help build them

● Willingness to own your work through the SDLC to Production and fix issues that arise from it

● Ability to work against a defined design and well-scoped tasks with guidance from senior engineers

Preferred

● Experience deploying and operating workloads on Azure

● Experience with event-driven architectures or enterprise messaging patterns

● Working command of distributed systems fundamentals across scaling, data storage, and correctness under failure

● Experience writing acceptance and end-to-end tests; experience with Playwright is desired

● Deeper understanding of harness mechanics, including memory, tool calls, and hooks, and how they shape agent behavior

● Experience with VB.NET

● Experience with API gateway technologies and API lifecycle management, including versioning and contracts

● Familiarity with event streaming platforms and asynchronous processing patterns

● Prior work in a fintech or financial services environment

● Experience integrating with third-party or external partner systems

📌 Software Engineer:: .NET C# in Guadalajara MX / Hybrid
🏢 XChange Software
📍 Guadalajara