[Hiring] Senior Full-Stack Software Engineer @3Pillar

Role Description

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.

• 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.

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.

Requirements

• 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.

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.