Senior Full-Stack Engineer at Koast.ai
Seeking a Senior Full-Stack Engineer to Shape the Future of AI-Powered Advertising
At Koast, we're transforming Meta media buying through cutting-edge AI workflows. Join our tight-knit engineering team (just 2 people today!) as our third key hire. You'll own critical systems end-to-end—from architecture to deployment—while building features that optimize global ad campaigns reaching millions.
Your Core Responsibilities
- Backend Development
Lead our Node.js + TypeStack services—designing data models, implementing features, and managing CI/CD pipelines independently. - Frontend Excellence
Develop responsive React components using modern hooks and state management, ensuring flawless cross-browser experiences. - AI Integration
Implement LLM-powered features including prompt engineering, response streaming, and cost-efficient API usage. - Full Feature Ownership
Drive features from concept to production—prototyping, coding, deploying, and monitoring with complete autonomy.
Required Skills & Experience
- 5+ years with Node.js & TypeScript—proven experience scaling production systems
- 3+ years with React—expertise in hooks, state management, and debugging
- Product-focused mindset—you deliver complete features, not just code
- Hands-on LLM experience—prompt engineering, streaming, and cost optimization
- AI-assisted development—regular use of tools like Copilot or Cursor
Bonus Qualifications
- NestJS or similar Node frameworks
- Next.js/React Server Components
- DevOps expertise: GitHub Actions, testing, monitoring
- Design system proficiency: Tailwind, MUI, or similar
Our Engineering Culture
These values define how we work—if they resonate with you, we'll make a great team:
- Technical Excellence: You pursue mastery beyond minimum requirements
- Innovation: You solve complex problems with creative solutions
- Ownership: You deliver on commitments and keep teams informed
- Perseverance: You tackle challenges head-on until they're solved
- Collaboration: You communicate clearly and share knowledge generously
Why Join Koast?
- Foundational Impact: Shape our architecture and core features used by 100+ customers
- Cutting-Edge Domain: Pioneer AI-driven advertising at scale with top brands
- Career Growth: Start as a contractor with potential for full-time role and equity
- Flexible Work: Remote-first with focus on results, not schedules
🎯 Pro Tip: Include a 1-2 minute video explaining why you're excited about this role—we'll prioritize your application!
How to Apply
Email [email protected] with "Koast to the moon" in the subject line. Include your resume, GitHub/portfolio, and optionally your intro video. Tell us what makes you uniquely qualified to drive impact at Koast.
Let's build the future of autonomous advertising together!