Sr Full-Stack Software Engineer .NET+React+AI REQ_157

3Pillar; Toluca; Remote; MXN 1,292,000 - 2,216,000; Full time

Benefits offered by this job

Major Medical Insurance

Life Insurance (optional)

Home office

Udemy - E-learning

26 days Christmas bonus

Discretionary Time Off

Job summary

3Pillar invites you to join a fast-moving, AI-enabled software team building a brand-new MVP. As a Sr Full-Stack Engineer, you'll craft backend in C#/.NET Core and frontend in React/TypeScript, with daily delivery flows and AI-assisted coding.

You’ll own scalable cloud-native services on AWS, implement secure APIs, and collaborate across LatAm and US time zones in a remote-first environment. The role emphasizes high-quality architecture, automated testing, and continuous learning.

Qualifications

• 5+ years building production apps with C#/ .NET Core and React (TypeScript).
• Daily use of AI-assisted coding tools (Cursor, Copilot, Claude Code).
• Cloud-native AWS with Docker containerization.
• Strong database and API design with PostgreSQL or MS SQL Server and ORMs.
• English communication for daily cross-functional work; LatAm time zone alignment.

Responsibilities

• AI-accelerated feature delivery using AI coding tools to complete user stories daily.
• Backend development of scalable microservices with C#/.NET Core, Web APIs, EF Core.
• Frontend development with React, TypeScript, Hooks, Context API, Zustand/Redux.
• Cloud infrastructure and pipelines on AWS with Lambda, SQS/SNS, Cognito, ECS, Docker.
• Document management features and e-signature integrations.
• Quality assurance with automated reviews, static analysis, and unit testing.

Skills

C# / .NET Core

React (TypeScript)

AI-assisted engineering

AWS

REST APIs

English communication

Tools

Claude Code

GitHub Copilot

Cursor

OpenAI

Docker

Entity Framework Core

PostgreSQL

MS SQL Server

Job description

Sr Full-Stack Software Engineer .NET+React+AI

Greetings, Future Tech Savant

Embark on an exciting journey into the realm of software development with 3Pillar! We extend an invitation for you to join our team and gear up for a thrilling adventure. At 3Pillar, our focus is on crafting cutting-edge technologies that revolutionize industries. As a Software Engineer, you'll play a vital role in our dynamic team, contributing to exciting projects that redefine urban living, establish new media channels for enterprise companies, or drive innovation in healthcare. This opportunity goes beyond code – it's about creating epic solutions that leave a lasting impression in the market. If your passion for programming fuels your drive to make a real-world impact, consider this your pass to the captivating world of Product Development!

Role Overview

We are looking for a high-velocity, adaptable Full Stack Software Engineer to join a fast-paced, high-impact product team building a brand-new MVP from the ground up.

In this role, you will work alongside an established engineering squad utilizing modern AI-assisted software development techniques to deliver code at exceptional speed. Rather than traditional multi-week sprint cadences, this team operates on a rapid, daily delivery flow—leveraging AI coding assistants to generate up to 95% of initial code drafts while maintaining high standards for technical architecture, automated testing, and security guardrails.

Core Responsibilities

• AI-Accelerated Feature Delivery: Utilize AI coding tools (Claude Code, GitHub Copilot, Cursor, OpenAI) to rapidly execute end-to-end user stories, refactor legacy logic, and prototype features at elevated daily cadences.
• Backend Development: Design and maintain scalable, cloud-native microservices using C# / .NET Core, Web APIs, Entity Framework Core, and modern event-driven architectures.
• Frontend Development: Build clean, responsive, and maintainable user interfaces with React (TypeScript, Functional Components, Hooks, Context API, Zustand/Redux).
• Cloud Infrastructure & Pipelines: Work with cloud services on AWS (Lambda, SQS/SNS, Cognito, ECS, Docker) and ensure integration into automated review pipelines and CI/CD workflows.
• Document Management & Signatures: Implement document lifecycle features, template creation, dynamic field population (first/last name, dynamic metadata), and e-signature integrations.
• Quality Assurance & Safeguards: Oversee automated code review guardrails, static code analysis, and unit testing (xUnit, NUnit, Jest, RTL) to validate AI-generated code outputs.

Minimum Qualifications

• 5+ Years of Hands-On Engineering Experience: Proven track record building and scaling production applications with C# / .NET Core and React (TypeScript).
• Proficiency in AI-Assisted Engineering: Hands-on daily experience using modern AI coding assistants (Cursor, GitHub Copilot, Claude Code) with strong prompt and context engineering skills.
• Cloud Native Architecture: Functional expertise using AWS services (Lambda, ECS, SQS/SNS) and containerization (Docker).
• Database & API Design: Strong proficiency with relational databases (PostgreSQL or MS SQL Server), ORMs, SQL query optimization, and RESTful microservice design.
• Timezone & Location Alignment: Located in LatAm (Mexico or Brazil strongly preferred) to support real-time, daily synchronous collaboration with US team members.
• Communication: Business-fluent English skills (written and spoken) for continuous daily cross-functional collaboration.

Nice-to-Have Experience

• Document Signature & eSign Integration: Prior experience integrating e-signature workflows (e.g., DocuSign, native PDF dynamic field population, automated e-signing templates).
• Cloud Certifications: Formal AWS certifications (Developer, Solutions Architect) or demonstrated deep knowledge of cloud-native infrastructure.
• NoSQL / Document Stores: Working experience with document databases (e.g., MongoDB).
• Kanban / High-Velocity Execution: Comfort working in dynamic, non-standard Agile environments focused on short, hourly/daily story completion cycles.
• Key Transcript-Driven Adjustments Applied
• Targeted AI Focus: Reframed AI tools from a secondary skill to a central operational model (95% target AI-assisted code generation, rapid daily cadences).
• DocuSign / Dynamic PDF Fields: Added document dynamic field auto-population and e-signature template experience under core responsibilities and preferred qualifications.

Benefits

• Vacations. According to the law from your first anniversary
• Discretionary Time Off (employees are able to take time off when necessary)*
• 26 days of Christmas bonus
• 75% vacation bonus
• Foo coupons
• Major Medical Insurance
• Life Insurance (optional)
• Savings Box (optional)
• Law benefits: IMSS, Afore, Infonavit
• Home office
• Udemy - E-learning

What is it like working for 3Pillar Global?

At 3Pillar, We Offer a World Of Opportunity

• Flexible Work Environment: Whether it's the office, your home, or a blend of both, we embody a remote-first approach from interviews through onboarding.
• Global Exposure: You will be part of a global team, learning from top talent around the world across cultures while speaking English daily.
• Well-being Focus: We dedicate focused efforts to company-wide well-being initiatives—from mental health support to generous time-off policies.
• Accelerated Growth: Our professional services model enables rapid career development across diverse projects, technologies, and client industries.