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Full Stack Engineer at Agent. Remote Location: Costa Rica. Job Title: Senior Full Stack Engineer. Location:. Remote (Preference for candidates based in Costa Rica). Type:. Full-time. Experience:. 5+ years. Industry:. B2B SaaS. About Our Client. Our client is a rapidly growing B2B SaaS company revolutionizing demand generation. Their real-time platform offers . cost-per-lead media inventory at scale. , along with intelligent automation to streamline campaign planning, purchasing, and management across multiple publishers.. As they expand their engineering and AI Ops teams, they are looking for experienced, hands-on engineers who thrive in fast-paced environments and love solving complex problems with scalable, modern technology.. The Role – Senior Full Stack Engineer. We’re looking for a . Senior Full Stack Engineer. who will be instrumental in building and scaling core features across our client’s real-time demand platform. You'll collaborate cross-functionally with product, AI Ops, and research teams to bring intelligent automation and optimization into the user experience.. You’ll work in a remote-first team, with strong ownership of your work, a startup mindset, and the opportunity to shape both product and engineering practices.. What You’ll Do. Design, develop, and maintain full-stack applications for a high-scale SaaS platform. Drive improvements in architecture, performance, code quality, and system reliability. Work closely with AI Ops and Research teams to implement smart, data-driven functionality. Champion clean code, testing, and continuous refactoring. Collaborate in an agile, feedback-driven product environment. Mentor other engineers and contribute to team growth. Tech Stack. Frontend:. React, TypeScript, JavaScript. Backend:. Node.js, RESTful APIs. Database:. PostgreSQL, SQL. Cloud Infrastructure:. AWS. Practices:. Clean code, CI/CD, refactoring, testing, automation. Who You Are. 5+ years of professional experience in full stack software engineering. Strong command of modern . JavaScript/TypeScript. , . React. , . Node.js. , and . SQL/PostgreSQL. Hands-on experience with . AWS. or similar cloud platforms. Experience working on . SaaS products. , preferably in or for the . U.S. market. Skilled problem-solver with an analytical mindset and a bias for action. Curious about . AI. and how it can enhance automation and decision-making. Comfortable in a dynamic, startup-style environment. A team player who enjoys cross-functional collaboration. Nice to Have. Experience with automation, AI Ops, or high-volume data applications. Exposure to AdTech, B2B media, or performance marketing. Contributions to developer tools or internal platforms. Creative projects or side builds that showcase initiative and curiosity. Team & Growth. Join a small, growing team: currently . 4 engineers + 1 lead. High-ownership culture with room for leadership and technical growth. Collaborate with cross-disciplinary teams, including AI researchers and product leadership. Interview Process. Recruiter Interview (30 min). – Introductory conversation to learn more about you and share details about the role. Technical Assessment. – A practical exercise to evaluate your coding and problem-solving skills. Team Lead Interview. – Deep dive into technical experience, collaboration, and engineering practices. Product Manager Interview. – Focus on cross-functional communication and product thinking. CEO Interview. – Final conversation to align on vision, culture, and growth. Compensation. Salary Range:. $4,500 – $6,500 USD/month. Employment Type:. Full-time, Remote. Perks & Benefits. 100% remote. Flexible working hours. High-impact work with ownership and autonomy. Opportunity to work on a platform powered by intelligent automation and AI. Collaborative, fast-moving team with startup energy. #LI-NC1