[Hiring] Senior Full Stack Developer @EX Squared

Role Description

Our client is seeking an experienced Senior Full Stack Developer to join their technology team. In this role, you will design and build scalable digital applications from the ground up using React and Node.js, while also creating the cloud infrastructure required to support them.

The position has a strong focus on:

• Agentic workflows
• API development
• Third-party integrations
• Application security
• Accessibility
• Production-ready engineering practices

You will collaborate with a distributed team of developers, QA professionals, and architects to research and solve complex technical challenges. This opportunity is ideal for a proactive and collaborative developer who takes ownership of their work, approaches problems with an innovative mindset, and knows when to seek support from the team.

Location: Fully remote position within LATAM.

Contract Duration: Fixed-term contract for six months, with the possibility of extension.

Language Requirement: Advanced English.

Qualifications

• At least five years of professional experience working with modern development frameworks and languages.
• Strong hands-on experience with React and Node.js.
• Ability to develop full-stack applications from scratch and deploy the infrastructure required to host them.
• Experience with AWS and Docker.
• Familiarity with AWS services such as ECS Fargate, Aurora, OpenSearch, S3, EventBridge, SQS, Cognito, and Bedrock.
• Experience integrating third-party SaaS tools and external APIs.
• Experience developing accessible interfaces that comply with WCAG 2.1 AA standards.
• Familiarity with OAuth 2.0, OpenID Connect, API key management, and access audit trail patterns.
• Exposure to role-based and attribute-based access control models, including RBAC and ABAC.
• Experience delivering applications with functional and automated tests using Jest and Cypress.
• Experience developing server-side rendered applications using Next.js or Nuxt.js.
• Experience with GraphQL and Apollo.
• Experience building or integrating MCP-compatible REST or GraphQL APIs.
• Understanding of API interface contracts, versioning, and consumer documentation.
• Familiarity with service-level objectives and production observability practices.
• Experience building or consuming agentic workflows.
• Advanced English communication skills and the ability to collaborate effectively with an international team.
• Strong ownership, initiative, problem-solving skills, and a collaborative, ego-free approach.

Requirements

• Hands-on experience implementing structured LLM outputs through function or tool calling.
• Familiarity with LLM evaluation approaches, including golden test sets, LLM-as-judge pipelines, and prompt regression testing.
• Ability to define measurable metrics for evaluating AI output quality.
• Previous experience with AWS Bedrock or similar generative AI platforms.
• Experience integrating platforms such as CreatorIQ, Frame.io, Microsoft 365 Graph, or social media APIs.
• An innovative mindset and genuine interest in experimenting with emerging technologies.
• The ability to work independently while communicating proactively and knowing when to ask for support.

Benefits

• 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. Applications outside these regions will not be considered.

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