Sr. Full-Stack Developer at Monks · Buenos…

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Sr. Full-Stack Developer

Employment Type: Full-Time

Experience Level: Senior

Industry: Technology, Digital Marketing, Web Development

About .Monks

Monks is the industry’s Agentic Transformation Partner, architecting the future of real-time brands. As a global marketing and technology services company, we go beyond traditional boundaries to design and operate Agentic Operating Systems that help brands innovate, organize, and operate at the speed of culture.

At Monks, we value T-shaped talent—people with deep craft mastery and a horizontal fluency in AI that allows them to collaborate across disciplines and deliver outcomes. With a global team of nearly 6,000 digital experts across 33 countries, you'll find a diverse group of colleagues with different backgrounds and perspectives. We believe everyone has something of value to offer, and that sustaining a truly diverse, equitable and inclusive workplace begins with fostering an environment where people can be themselves, authentically, every day.

Job Summary

We are seeking a highly skilled Full-Stack Developer to drive the evolution of our proprietary central orchestration platform. In this role, you will bridge the gap between practical user experience and powerful server-side logic, helping us scale the internal tooling that enables our teams to operate more effectively and competitively.

The ideal candidate has a keen eye for UI execution, a proven "feel" for UX, and strong engineering fundamentals. You will translate complex management requirements into user-friendly, responsive interfaces while building high-performance APIs, robust bi-directional integrations, and automated workflows.

Key Responsibilities

Frontend Architecture & UI Execution

• Develop, implement, and maintain robust, responsive, and intuitive web applications using ReactJS and TypeScript.
• Utilize Material Design libraries (MUI) to build a consistent, professional, and highly functional internal toolkit.
• Design and manage scalable design systems to ensure consistency across internal tooling projects.
• Optimize frontend performance and scalability, ensuring the interface remains 100% stable, intuitive, and high-performing.

Backend Engineering & System Integration

• Develop and maintain robust server-side logic (utilizing PHP/Symfony as our core platform language), ensuring high performance, responsiveness, and reliability.
• Design, implement, and document secure RESTful APIs and Web Services that adhere to industry standards.
• Build and maintain complex, bi-directional data syncs across our enterprise stack (including Salesforce, NetSuite, Workday, and other custom internal tooling) to secure "One Source of Truth" across project data.
• Work with database systems, driving setup, maintenance, query optimization, and structuring.

Platform Evolution & Collaboration

• Evolve core platform features to meet adapting business needs, including time-tracking modules, timesheet approval workflows, and advanced data validation.
• Integrate AI-driven features like agentic workflows to automate internal processes and scale operational efficiency.
• Focus on reducing "gap time friction" and automating manual workflows to accelerate business velocity and eliminate operational bottlenecks.
• Debug, troubleshoot, and resolve complex full-stack issues, bottlenecks, and performance bugs.
• Provide technical guidance, documentation, and support to the wider Monk community on the platform’s capabilities.

Qualifications

• Experience: 3-5+ years of professional full-stack web development experience.
• Frontend Expertise: Strong proficiency in ReactJS, with a solid foundation in TypeScript, JavaScript (ES6+), HTML5, and CSS3. Strong understanding of responsive design and cross-browser compatibility.
• Backend Expertise: Strong backend development background. Experience with PHP and MVC frameworks (such as Symfony) is highly preferred; however, we are fully open to strong engineers from other language ecosystems who are willing to quickly adapt, leveraging AI-assisted coding and development tools to bridge any syntax gaps.
• Integration & APIs: Proven experience in REST API design, Web Services, and integrating third-party APIs (including authentication protocols like OAuth).
• Cloud & DevOps: Familiarity with modern cloud platforms (AWS, GCP, or Azure) and containerization/virtualization tools (e.g., Docker).
• Curiosity-First Mindset: You don’t wait for a manual; you play, break things, and ask "What if?" to adopt new tools and workflows.
• Collaboration: Experience working effectively in agile development environments (Scrum/Kanban). Excellent communication and alignment skills.
• Language: Excellent communication skills in English, both written and verbal.

Technical Skills

• Frontend Tooling: Familiarity with modern frontend build tools and UI frameworks/libraries (e.g., TailwindCSS, Styled Components, Material UI, Vite).
• Testing: Experience with full-stack testing practices and frameworks (e.g., Vitest, Jest, Playwright).
• Databases: Proficiency with database technologies such as SQL Server, PostgreSQL, or NoSQL databases.
• CI/CD & Infrastructure: Knowledge of DevOps practices, Git version control, and CI/CD pipelines.
• Security: Strong understanding of security principles and best practices in web application development (OWASP, data privacy, secure authentication).

Bonus Skills

• Experience with ERP and CRM integrations, specifically NetSuite and Salesforce.
• Familiarity with design tools such as Figma to facilitate developer-to-designer handoffs.
• Experience with container orchestration tools like Kubernetes.
• Experience or secondary proficiency in other programming languages (e.g., Node.js, Python).

#LI-Hybrid #LI-AS1

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.