Sr Fullstack Engineer
Confirmed on the employer's own hiring board on Oct 13, 2026. First seen by Alion on Aug 5, 2026.
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This post is to review candidates for a vacancy that will be opening soon. Please keep thisin mind and await our call.
Senior Fullstack Engineer
Build across the stack and ship features that hold up.
As part of our commitment to inclusion and in compliance with Law 2466 of 2025 from Colombia, we have available spaces for people with disabilities.
About the Role
We build production web applications for clients, and we like engineers who are comfortable owning a feature from the database to the interface. As a Senior Fullstack Engineer, you work across React / Next.js and Node / TypeScript to design, build, and ship features that stay reliable in production.
You'll work inside a Monks delivery team, alongside clients, product, and design, taking real ownership of the parts of the product you build.
We're all-in on agentic engineering. Tools like Claude Code and Codex are part of our everyday workflow, and we're looking for people who are genuinely fluent working alongside AI coding agents and excited to push those practices further.
Who You Are
- Comfortable across the whole stack: you move between frontend and backend without friction.
- Ownership-minded: you take a feature from idea to shipped, and you sweat the details.
- A pragmatic problem-solver: you pick the simplest thing that works and holds up.
- A clear communicator: you keep clients and teammates in the loop without noise.
What You'll Do
- Design, build, and maintain features across the frontend (React / Next.js) and backend (Node / TypeScript).
- Build and consume APIs, and model the data behind them.
- Review code, including AI-generated code, for quality and consistency.
- Collaborate with product, design, and other engineers to ship end to end.
- Troubleshoot and resolve production issues.
- Contribute to the team's standards, tooling, and practices.
What You Bring
- 5+ years building and shipping full-stack web applications.
- Strong TypeScript: React and Next.js on the front end, Node on the back end.
- Solid API design and data modeling.
- Experience building on AWS.
- Good testing habits and an eye for maintainable code.
- Strong English communication skills.
- Comfortable in a fast-paced, agile consulting environment.
Extra Credit
- You've worked on AI-heavy products or integrated LLMs.
- Deep PostgreSQL experience.
- You've built or maintained a design system.
- Familiarity with CI/CD and DevOps practices.
- Open-source work you're proud to link.
#LI-PC1
About Monks
Monks is the global, digital-first, data-driven, unitary operating brand of S4Capital plc, where our culture centers on how we show up for the work and for one another. That begins with the commitment to strive for mastery-taking deep pride in our craft and creating work that sets the bar. In everyday execution, we drive momentum by choosing bold action rather than waiting for certainty. Above all, our teams are stronger together, bringing diverse perspectives into a unified team that communicates with clarity, trust, and mutual respect.
This commitment to craft and innovation translates directly into widespread industry acclaim: Monks was named a Contender in The Forrester Wave™: Global Marketing Services and a leader in the 2026 Gartner® Magic Quadrant™ for Global Digital Marketing Agencies. It ranks among Cannes Lions' Top 10 Creative Companies (2022-25) and remains the only partner featured in AdExchanger’s Programmatic Power Players list every year (2020-24). Named Adweek’s first AI Agency of the Year (2023) and The One Show’s inaugural AI Pioneer Organization (2025), Monks was also awarded Business Intelligence Group’s 2026 Excellence in Artificial Intelligence Award in the Human-Machine Interaction Team category. Additionally, Monks.Flow earned AI-based Marketing Solution of the Year at the 2026 AI Breakthrough Awards and a 2026 Global Generative AI Award in the Agentic Marketing Innovation category. Finally, Monks achieved a record-breaking number of FWAs and continues to hold the most of any partner.
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.