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Senior Backend Engineer
Build the services everything else relies on.
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 systems for clients where the backend has to be correct, scalable, and observable. As a Senior Backend Engineer, you design and build the services, APIs, and data layers that the rest of the product depends on.
You'll work inside a Monks delivery team, alongside clients, product, and other engineers, owning the parts of the system that have to be right.
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
- Ownership-minded: you treat the services you build as yours to keep healthy.
- Rigorous: correctness, performance, and observability are habits, not afterthoughts.
- A pragmatic problem-solver: you build the simplest thing that scales.
- A clear communicator: you explain technical trade-offs plainly.
What You'll Do
- Design, build, and maintain scalable services in Node / TypeScript.
- Design and implement REST (and where it fits, GraphQL) APIs.
- Model data and safeguard its integrity and performance in PostgreSQL.
- Review code, including AI-generated code, for quality and consistency.
- Troubleshoot and resolve complex backend issues.
- Contribute to the team's standards, tooling, and architecture.
What You Bring
- 5+ years in backend development with strong Node / TypeScript.
- Solid REST API design and implementation.
- Strong PostgreSQL and relational data modeling.
- Experience building on AWS (e.g. Lambda, SQS, SNS, S3).
- A good grasp of service architecture and distributed systems.
- Good testing habits.
- Strong English communication skills.
- Comfortable in a fast-paced, agile consulting environment.
Extra Credit
- You've integrated LLMs or built AI-backed services.
- Experience with event-driven systems and message queues.
- Docker and Kubernetes.
- Depth in another ecosystem (Python, Go) you can bring across.
- Open-source work you're proud to link.
#LI-PC1
#LI-Remote
About Monks
Monks is the global, digital-first, data-driven, unitary operating brand of S4 Capital plc. With a legacy of innovation and specialized expertise, Monks combines an extraordinary range of global Marketing and Technology Services to redefine how brands interact with the world. Through Monks.Flow, its flagship AI ecosystem for marketing orchestration, Monks transforms marketing into a growth engine, collapsing timelines and connecting brands to culture in real time. By deploying bespoke intelligent agents across disciplines and delivering culturally relevant, high-impact creative and digital solutions, Monks solves key critical business challenges across the entire brand enterprise to help brands sustain long-term impact.
Monks was named a Contender in The Forrester Wave™: Global Marketing Services, 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, Monks was also awarded Business Intelligence Group’s 2025 Excellence in Artificial Intelligence Award in both the Organizational and AI Product categories. As a trusted partner to cutting-edge innovators in tech, Monks earned titles such as Optimizely Experimentation Partner of the Year (2025), runner-up for the Adobe Firefly Partner Award (2024), and Workato’s AI Visionary Customer Impact Award (2024). Additionally, 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.
