Senior Backend Engineer Tech Lead (3-4 month long) - Remote - Latin America

FullStack; Rosario; Remote; ARS 212,899,000 - 319,348,000; Full time

Benefits offered by this job

100% remote work

Competitive pay

Continuing education opportunities

Opportunity to work with startups and

Fortune 500 clients

Job summary

FullStack is seeking a Senior Backend Engineer Tech Lead to join our client’s team for a 3–4 month project. You’ll work alongside designers and engineers, shaping architecture and driving backend excellence.

Requirements include 6+ years in software engineering, 2+ years in tech leadership, and strong experience with Node.js, TypeScript, AWS, and MongoDB. Advanced English is essential for collaboration with US clients.

Qualifications

• 6+ years of professional software engineering experience.
• 2+ years of technical leadership influencing architecture and engineering direction.
• Advanced English is required.
• Four-year college degree is required.
• Expertise in Node.js and TypeScript.
• Experience with Backend-for-Frontend (BFF) and mobile-focused API middleware.
• Experience with AWS services (EC2, ECS, Lambda, ElastiCache, S3, CloudFront).
• Solid background in MongoDB and deployment pipelines.
• Experience with AI tools and LangChain or similar.

Responsibilities

• Integrate into the client's team and collaborate with designers and engineers daily.
• Lead architectural decisions and influence engineering direction.
• Design and secure scalable microservices and APIs for high-scale systems.

Skills

Node.js

TypeScript

AWS

MongoDB

APIs

Microservices

LLM integration

Agile/Scrum

CI/CD

Frontend-backend integration

Education

Bachelor's degree

Tools

Salesforce OCAPI

CMS

LangChain

LlamaIndex

Job description

About FullStack

FullStack is your AI-native engineering partner, built to turn AI capability into certainty. Most companies can demo AI; few can get it to production and prove what it produced. We close that gap with three capabilities, AI built into your products from the start, elite vetted talent who apply it, and transparent execution that shows value every step of the way. With now over 600 customers in North America, FullStack is one integrated partner for all your AI engineering needs. With FullStack, you move forward with confidence.

We’re Most Proud Of

• Offering life-changing career opportunities to talented software professionals across the Americas.
• Building highly-skilled software development teams for hundreds of the world’s greatest companies.
• Having delivered hundreds of successful custom software solutions, which have positively impacted the lives and careers of millions of users.
• Our 4.1-star rating on GlassDoor.
• Our client Net Promoter Score of 68, twice the industry average.

The Opportunity

Join our talent network and connect with U.S. clients for flexible, project-based development work as a Senior Backend Engineer Tech Lead (3-4 month long).

• You will integrate directly into our client's team and work alongside their existing designers and engineers on a daily basis.

What We're Looking For

• 6+ years of professional software engineering experience.
• 2+ years of experience in technical leadership influencing architecture and engineering direction.
• Advanced English is required.
• Successful completion of a four-year college degree is required.
• Expertise in Node.js and TypeScript.
• Track record of architecting Backend-for-Frontend (BFF) systems and robust API middleware specialized for mobile platforms.
• Demonstrated experience working with AWS cloud services (specifically EC2, ECS, Lambda, ElastiCache, S3, and CloudFront).
• Solid background in MongoDB and optimizing backend deployment pipelines.
• Experienced with Salesforce OCAPI/API, CMS-driven content management, and mobile-specific third‑party integrations.
• Strong history of designing and securing scalable microservices and event‑driven architectures for high‑scale e‑commerce systems.
• Comfortable working with AI development tools, including LLM integration (LangChain or LlamaIndex) and agentic workflows.
• Skilled at representing engineering teams in client‑facing interactions and collaborating with external vendors.
• Ability to work through new and difficult issues and contribute to libraries as needed.
• Ability to create and maintain continuous integration and delivery of applications.
• Forensic attention to detail.
• A positive mindset and a can‑do attitude.
• Experience working on Agile/Scrum teams.
• Meaningful experience working on large, complex systems.
• Ability to take extreme ownership over your work. Every day is a challenge to ensure you are performing to the expectations you and your team have agreed upon.
• Ability to identify with the goals of FullStack's clients and dedicate yourself to delivering on the commitments you and your team make to them.

Nice To Have

We’re Seeking Engineers Who Are AI‑enthusiastic In Their Workflow. Professional Experience Or Personal Project Work With The Following Is a Significant Plus

• Cursor, Windsurf, or Google Antigravity.
• Claude Code, Gemini CLI, Codex, or Copilot CLI.

Work Authorization Requirements

• Applicants must be currently authorized to work in the country of this job posting on a full‑time basis.
• FullStack will not sponsor applicants for work visas now or in the future.

What We Offer

• Competitive pay.
• 100% remote work.
• The ability to work with leading startups and Fortune 500 companies.
• Continuing education opportunities.
• Opportunity to grow and expand your career.

Our talent network is committed to fostering a diverse, inclusive, and accessible environment where IT professionals can find opportunities that match their skills. We welcome individuals of all races, religions, genders, sexual orientations, national origins, abilities, and experiences. Our focus is on connecting talent with projects based on qualifications, ensuring a fair and transparent process that values diverse perspectives and global collaboration.

Learn more about our Applicants Privacy Notice.