Senior Full Stack Developer, Node, React

EX Squared

. Architect and develop full-stack applications from the ground up using React and Node.js .

Posted 9/30/2026contractRemote • ColombiaSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in architecting and developing full-stack applications using React and Node.js, with a strong focus on building scalable cloud infrastructure and integrating third-party APIs. Proficient in developing accessible interfaces compliant with WCAG 2.1 AA standards and implementing automated testing practices.

Highest-signal resume keywords

React DevelopmentNode.js DevelopmentAWS ServicesGraphQL API DevelopmentAutomated Testing with Jest and Cypress

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Full-Stack Application DevelopmentREST API DevelopmentGraphQL API DevelopmentCloud Infrastructure DesignAccessible Interface DevelopmentOAuth 2.0API Key ManagementRBAC and ABAC ModelsServer-Side Rendering with Next.jsMCP-Compatible API Integration

Soft Skills

Problem-SolvingCollaborationInitiativeEffective CommunicationOwnership

Tools & Technologies

AWSDockerMicrosoft GraphCypressJestEventBridgeS3OpenSearchCognitoBedrock

Industry Keywords

WCAG 2.1 AA ComplianceService-Level ObjectivesProduction ObservabilityAgentic WorkflowsSaaS Integration

Tech Stack

Tools & technologies

ApolloAWSCloudCypressDockerGraphQLJavaScriptJestNext.jsNode.jsNuxtReact

About the role

Key responsibilities & impact

Architect and develop full-stack applications from the ground up using React and Node.js
Build scalable application logic and cloud infrastructure for digital products and agentic workflows
Design systems enabling autonomous agents to interact, make decisions, and execute tasks
Develop and maintain REST and GraphQL APIs
Build and integrate MCP-compatible REST and GraphQL APIs
Integrate third-party SaaS platforms and external services, including Microsoft Graph and social media APIs
Optimize website and application performance
Develop accessible interfaces compliant with WCAG 2.1 AA standards
Apply authentication, authorization, API key management, and access auditing throughout development
Implement functional and end-to-end automated tests using Jest and Cypress
Define service-level objectives and apply production observability practices, including logs, metrics, and distributed traces
Participate in technical research, solution design, and resolution of complex engineering challenges
Collaborate with developers, QA professionals, architects, and stakeholders across the development lifecycle
Create and maintain API documentation, interface contracts, and versioning standards

Requirements

What you’ll need

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 RBAC and ABAC access control models
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
Ability to collaborate effectively with an international team
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 CreatorIQ, Frame.io, Microsoft 365 Graph, or social media APIs
Strong ownership, initiative, problem-solving skills, and a collaborative, ego-free approach

Benefits

Comp & perks

Competitive compensation in USD
Access to learning platforms and professional development opportunities
Flexible work environment
Collaborative and multicultural teams
Supportive, flexible, and people-focused environment
Continuous learning and open collaboration