Senior Full Stack Developer

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EX Squared

WebsiteLinkedInAll Job Openings

501 - 1000 employees

Founded 2000

💼 Consulting

🤖 Artificial Intelligence

🤝 B2B

Consulting • Artificial Intelligence • B2B

EX Squared is a digital product and experience consultancy that helps enterprises move AI and digital initiatives from ambition into production. Since 2001 the firm has delivered strategy, UX/UI and multi-channel digital experiences plus engineering and IT infrastructure work, and specializes in GenAI, machine learning, computer vision, and NLP. EX Squared is a certified Optimizely and Sitecore partner and focuses on building enterprise-scale digital products and advanced AI-driven solutions for large B2B clients.

📋 Description

• Architect and develop full-stack applications from the ground up using React and Node.js. • Build scalable application logic and cloud infrastructure to support digital products and agentic workflows. • Design systems that enable autonomous agents to interact, make decisions, and execute tasks. • Develop and maintain REST and GraphQL APIs that allow applications and services to communicate effectively. • 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 to ensure fast and efficient user experiences. • Develop accessible user interfaces that comply with WCAG 2.1 AA standards. • Apply security principles throughout the development lifecycle, including authentication, authorization, API key management, and access auditing. • Implement functional and end-to-end automated tests using Jest and Cypress. • Define service-level objectives and apply observability practices across production services, including logs, metrics, and distributed traces. • Participate in technical research, solution design, and the resolution of complex engineering challenges. • Collaborate closely with developers, QA professionals, architects, and other stakeholders throughout the complete development lifecycle. • Create and maintain clear API documentation, interface contracts, and versioning standards.

🎯 Requirements

• 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.

🏖️ Benefits

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