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Senior Full Stack Engineer (NodeJS + React)

Location: Colombia

.Monks Technology Services, part of Media.Monks and S4 Capital, is a global consulting firm mastering AI-powered transformations for the Fortune 100. We combine long-term strategic thinking, deep enterprise experience, and a human-centered approach to help clients transform business processes and dominate their industries.

About the Role

As a Senior Full Stack Engineer (NodeJS + React), you’ll own features end-to-end—from technical design through build, test, and deployment—delivering modern React single-page applications and NodeJS microservices/APIs. You’ll work across greenfield and existing systems in a roughly 65/35 frontend-to-backend split, collaborating closely with product, design, and engineering partners to ship high-quality software with a strong focus on maintainability and automated testing.

Responsibilities

• Design and build new user-facing features and complex UI components using React
• Develop and maintain NodeJS microservices and backend APIs with a focus on performance, reliability, and reusability
• Design, build, and support RESTful APIs that integrate cleanly with frontend and downstream services
• Write comprehensive unit and integration tests to ensure stability and code quality
• Contribute to technical design discussions and architectural decisions for new features and components
• Troubleshoot bugs, identify bottlenecks, and implement sustainable fixes and improvements
• Collaborate with product managers, designers, and engineers in an agile delivery environment
• Own the full development lifecycle, including occasional setup of CI/CD pipelines for new services
• Other duties as assigned

About You

Qualifications & Skills

• 8+ years of professional software development experience (10+ preferred)
• Strong proficiency building modern frontend applications with React and its ecosystem
• Deep expertise in backend development with NodeJS (or similar), including building services outside of monolithic frameworks
• Proven experience designing, building, and maintaining RESTful APIs
• Strong experience with PostgreSQL, including ORM basics and query knowledge
• Hands-on experience with Docker for containerization and orchestration
• Demonstrated commitment to automated testing, including unit and integration test coverage
• High ownership, autonomy, and excellent communication/collaboration skills
• Nice-to-have: Strong SQL proficiency
• Nice-to-have: Experience with Jest (or similar testing frameworks)
• Nice-to-have: Experience with additional backend languages such as Python

.Monks Technology Services does not discriminate on the basis of race, sex, color, religion, age, national origin, marital status, disability, veteran status, genetic information, sexual orientation

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About Monks

Monks is the global, purely digital, unitary operating brand of S4Capital plc. With a legacy of innovation and specialized expertise, Monks combines an extraordinary range of global marketing and technology services to accelerate business possibilities and redefine how brands and businesses interact with the world. Its integration of systems and workflows delivers unfettered content production, scaled experiences, enterprise-grade technology and data science fueled by AI—managed by the industry’s best and most diverse digital talent—to help the world’s trailblazing companies outmaneuver and outpace their competition.

Monks was named a Contender in The Forrester Wave™: Global Marketing Services. It has remained a constant presence on Adweek’s Fastest Growing lists (2019-23), ranks among Cannes Lions' Top 10 Creative Companies (2022-23) and is the only partner to have been placed in AdExchanger’s Programmatic Power Players list every year (2020-24). In addition to being named Adweek’s first AI Agency of the Year (2023), Monks has been recognized by Business Intelligence in its 2024 Excellence in Artificial Intelligence Awards program in three categories: the Individual category, Organizational Winner in AI Strategic Planning and AI Product for its service Monks.Flow. Monks has also garnered the title of Webby Production Company of the Year (2021-24), won a record number of FWAs and has earned a spot on Newsweek’s Top 100 Global Most Loved Workplaces 2023.

We are an equal-opportunity employer committed to building a respectful and empowering work environment for all people to freely express themselves amongst colleagues who embrace diversity in all respects. Including fresh voices and unique points of view in all aspects of our business not only creates an environment where we can all grow and thrive but also increases our potential to produce work that better represents—and resonates with—the world around us.