Senior FullStack Developer (Node+React) - 6 months

At EX Squared LATAM, we are a digital transformation company focused on building innovative, high-impact technology solutions that drive real business value. We partner with top-tier clients across global, regional, and local markets, fostering a collaborative, inclusive, and innovation-driven culture where your ideas truly matter.

Role Overview

Our client is a Canadian digital agency that combines data, technology, and creativity to deliver high-performing campaigns, digital products, and connected customer experiences. With deep expertise across the automotive, financial services, telecommunications, and retail sectors, they have built integrated CRM journeys, robust digital experiences, and national loyalty programs for leading brands.

Their team takes a pragmatic, results-driven approach, creating solutions grounded in their clients' business realities and focused on measurable outcomes through strong collaboration and flawless execution.

Their Technology team is a distributed group of 50+ Developers, QA Engineers, and Architects building modern digital products on a leading-edge technology stack.

They are currently seeking an experienced Senior Full Stack Developer for a contract opportunity to join their team.

Location: Fully remote position within LATAM.

Contract Duration: Fixed term (6-8 months)

Language Requirement: Advanced English.

What you'll do

• Design, develop, and maintain full-stack applications using React and Node.js.
• Architect and build scalable cloud infrastructure to support modern web applications.
• Develop systems that enable agentic workflows and autonomous agent interactions.
• Design secure, scalable, and maintainable application architectures with security best practices built in.
• Research, analyze, and solve complex technical challenges independently and collaboratively.
• Collaborate closely with cross-functional teams to deliver high-quality solutions.
• Take ownership of projects from concept to deployment, demonstrating initiative and accountability.
• Continuously explore new technologies and contribute innovative ideas to improve products and processes.

Role scope

• Optimizing website performance: Making sure websites load quickly and efficiently.
• Developing APIs (Application Programming Interfaces): Creating interfaces that allows different applications to communicate with each other.
• Understanding the entire web development process: Having a holistic view of how the front end and back end work together.
• Working with different technologies: Being proficient in a variety of programming languages, frameworks, and tools. 

What you'll bring

• Be available to collaborate with the team in our Toronto office.
• Familiarity with AWS & Docker. Familiiarity with ECS Fargate, Aurora, OpenSearch, S3, EventBridge/SQS, Cognito, Bedrock.
• Third-party SaaS integration experience. Worked on integration with 3rd party tools like CreatorIQ, Frame.io, Microsoft 365 Graph, social media apis.
• 5+ years of working knowledge with modern frameworks and languages (REACT & NodeJS)
• Experience developing UI that is accessible - WCAG 2.1 AA compliant.
• Familiarity with OAuth2/OIDC, API key management, and access audit trail patterns.
• Exposure to working with RBAC/ABAC.
• Experience shipping with functional Jest and Cypress tests.
• Experience with Next.js or Nuxt.js SSR applications
• Experience with GraphQL and Apollo
• Experience building or integrating MCP-compatible REST/GraphQL APIs; familiarity with tool interface contracts, versioning, and consumer documentation.
• Familiarity with SLO definition and basic observability practices (logs, metrics, distributed traces) for production API services.
• Experience building or consuming agentic workflows 

What will make you stand out

• Hands-on experience with LLM structured output patterns: function/tool calling
• Familiarity with LLM evaluation approaches: building golden test sets, LLM-as-judge pipelines, and prompt regression testing; ability to quantify output quality with measurable metrics rather than vibes.

Why EX Squared?

At EX Squared, we believe in building strong, collaborative teams that create meaningful impact. You’ll work alongside talented professionals across the region, contributing to innovative projects while continuing to grow your career in a supportive, flexible, and people-focused environment.

We value curiosity, ownership, continuous learning, and open collaboration, creating an environment where professionals can thrive, grow, and make a difference.

What We Offer

• Competitive compensation in USD.
• Access to learning platforms and professional development opportunities.
• Flexible work environment.
• Collaborative and multicultural teams.

Eligibility Note

This opportunity is only available to candidates currently residing in Latin America or Brazil. Applications outside these regions will not be considered.

Ready to become an EXpert?

Join our EXperts team! #ApplyNow