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About the Role

We are seeking a Mid-Senior Full-Stack Engineer to join our Product Engineering team. This role is responsible for building and maintaining web applications for our advertising platform, including campaign management, billing, and dashboards. You will work across our frontend (React/TypeScript) and backend (Java/Spring Boot) stack, delivering features end-to-end.

Responsibilities

• Design and implement full-stack features across React (TypeScript, Tailwind CSS, Vite) and Spring Boot (Java 17, PostgreSQL) codebases
• Build and maintain RESTful APIs with proper authentication, authorization, and input validation
• Design and evolve PostgreSQL database schemas using Flyway migrations
• Develop responsive, accessible UI components following existing design patterns and component libraries
• Integrate with third-party advertising platform APIs (Google Ads, Meta Marketing API, Adform)
• Implement and maintain OAuth flows for external platform connections
• Build complex business logic including billing calculations, invoice generation, and payment processing workflows
• Write efficient database queries and optimize application performance for large datasets
• Collaborate with the data engineering team on Snowflake integrations
• Participate in code reviews, providing constructive feedback and maintaining code quality standards
• Troubleshoot production issues across the full stack using AWS CloudWatch logs and application monitoring
• Contribute to CI/CD pipeline maintenance and deployment processes

Requirements

• 4-6 years of professional software engineering experience in full-stack web development
• Strong proficiency in Java (11+) and Spring Boot, including Spring Security, Spring Data JPA, and RESTful API design
• Strong proficiency in React (16+) with TypeScript, including hooks, state management, and modern component patterns
• Solid experience with PostgreSQL including schema design, query optimization, indexing strategies, and migrations
• Experience with CSS frameworks (Tailwind CSS preferred) and building responsive layouts
• Familiarity with cloud services, particularly AWS (S3, SES, Lambda, ECS, CloudWatch)
• Experience integrating with third-party REST APIs and OAuth 2.0 authentication flows
• Understanding of Git workflows, pull request processes, and collaborative development practices
• Ability to independently own features from technical design through deployment
• Strong debugging skills across frontend and backend, including browser DevTools and server-side logging
• Must be able to work primarily between the hours of 9:30 AM - 6:30 PM ET
• Must have a player/coach mentality, willing to both execute and lead
• Ability to juggle multiple projects concurrently and set and meet deadlines
• Skilled at receiving and providing direct feedback
• Collaborative mindset and great teamwork skills
• Entrepreneurial & adaptable; great learning skills
• Curious, research-minded, data-informed
• Able to search for possible solutions and apply them
• Creative confidence
• Proactive communicator
• A sense of humor and a love of online culture
• Thrives in a start-up culture

Skills

• React
• TypeScript
• Tailwind CSS
• Vite
• Java
• Spring Boot
• PostgreSQL
• Flyway
• RESTful APIs
• OAuth
• Snowflake
• AWS
• Git
• CloudWatch

Experience Level

• Mid-Senior

About the Company

• The COOL company is a global leader in AI-powered advertising technology, helping brands, agencies, and publishers simplify advertising and amplify performance.
• Powered by COOL AI, our intelligent platform unifies creative generation, media activation, optimization, and attribution into one continuously learning system.
• Our innovation and growth have earned industry-wide recognition, including being named a 7-time recipient of the Inc. 5000 list of America's Fastest-Growing Private Companies, a 2-time Deloitte Technology Fast 500 honoree, recognized on Crain's New York Fast 50, honored by the Digiday Media Awards for helping modernize digital media, and named one of Adweek's Top 10 Fastest Growing Solution Providers globally.
• We're building the future of advertising, where every signal becomes intelligence and every optimization drives performance.
• As we continue to grow globally, we're looking for curious, ambitious people who want to work with cutting-edge AI technology, solve complex challenges, and help redefine what's possible in modern advertising.