Koast.ai: Senior Full-Stack Engineer: Exciting Early-Stage Startup
Headquarters: Tampa, Florida URL: https://koast.ai Are you an experienced engineer looking for an exciting start-up opportunity in the process of finding PMF? Keep reading! We’re Koast, on a mission to revolutionize Meta media buying with AI-powered workflows. We’re looking for a talented Senior Full-Stack Engineer to join our growing engineering team (currently 2 people!). As the third member of our technical team, you’ll take full ownership of core systems, from data models to production deployments. You’ll play a crucial role in building features that power sophisticated ad campaigns reaching millions of people globally. What You’ll Do Daily Backend MasteryArchitect, implement, and operate our Node.js + TypeScript services - data models through CI/CD - without hand-holding. Front-End CraftsmanshipShip React components using hooks and state libs, nail pixel-perfect UIs, and squash cross-browser quirks. LLM Feature IntegrationDesign prompts, manage streaming, and build rate-limit/cost controls around GPT-class models. End to End Feature LifecycleTake features from spec → prototype → code → deploy → monitor, owning each step without hand-holding. Must-Have Technical Experience Node.js & TypeScript (5+ yrs) — you’ve owned production services from spec to scale. React (3+ yrs) — modern hooks, state libs, and deep browser-debug skills. End-to-End Product Mindset — you think in features, not tickets, and drive them all the way home. LLM-Powered Features — hands-on prompt design, streaming integrations, and cost/rate-limit handling. AI-Augmented Dev — Copilot/Cursor (or similar) are your daily co-pilots. Nice-to-Have (Will Make Us Smile) NestJS or another opinionated Node framework Next.js / React Server Components Dev-ex tooling: GitHub Actions, automated testing, observability, profiling Design-system fluency: Tailwind, MUI, Chakra, or custom component libs How You Work We live by these values - if they sound like you, you’ll fit right in.... Mastery: You push beyond “good enough,” constantly honing your craft. Push the Boundaries: You tackle ambitious challenges and unlock new possibilities. Embrace the Challenge: You collaborate shoulder-to-shoulder when the stakes are high. Responsibility: You own your commitments, deliver on time, and keep teammates aligned. Dedication: You dive head-first into tough problems, iterating until they’re solved. Collaboration: You communicate clearly, share knowledge freely, and build together. Why Koast.ai? Early-Stage ImpactYour work will define our architecture and ship features that 100+ customers rely on every day. AI & Ads at ScaleJoin the frontier of AI-powered media buying - supercharge budgets and decision-making in real time for some of the best ad teams in the world. Growth & OwnershipStart as a contractor, grow into a full-time role, and potentially earn equity. Remote & FlexibleWork from anywhere on your schedule—just deliver high-quality code (and have fun doing it!).
Headquarters: Tampa, Florida
URL: https://koast.ai
Are you an experienced engineer looking for an exciting start-up opportunity in the process of finding PMF?
Keep reading!
We’re Koast, on a mission to revolutionize Meta media buying with AI-powered workflows. We’re looking for a talented Senior Full-Stack Engineer to join our growing engineering team (currently 2 people!). As the third member of our technical team, you’ll take full ownership of core systems, from data models to production deployments. You’ll play a crucial role in building features that power sophisticated ad campaigns reaching millions of people globally.
What You’ll Do Daily
-
Backend Mastery
Architect, implement, and operate our Node.js + TypeScript services - data models through CI/CD - without hand-holding. -
Front-End Craftsmanship
Ship React components using hooks and state libs, nail pixel-perfect UIs, and squash cross-browser quirks. -
LLM Feature Integration
Design prompts, manage streaming, and build rate-limit/cost controls around GPT-class models. -
End to End Feature Lifecycle
Take features from spec → prototype → code → deploy → monitor, owning each step without hand-holding.
Must-Have Technical Experience
-
Node.js & TypeScript (5+ yrs) — you’ve owned production services from spec to scale.
-
React (3+ yrs) — modern hooks, state libs, and deep browser-debug skills.
-
End-to-End Product Mindset — you think in features, not tickets, and drive them all the way home.
-
LLM-Powered Features — hands-on prompt design, streaming integrations, and cost/rate-limit handling.
-
AI-Augmented Dev — Copilot/Cursor (or similar) are your daily co-pilots.
Nice-to-Have (Will Make Us Smile)
-
NestJS or another opinionated Node framework
-
Next.js / React Server Components
-
Dev-ex tooling: GitHub Actions, automated testing, observability, profiling
-
Design-system fluency: Tailwind, MUI, Chakra, or custom component libs
How You Work
We live by these values - if they sound like you, you’ll fit right in....
-
Mastery: You push beyond “good enough,” constantly honing your craft.
-
Push the Boundaries: You tackle ambitious challenges and unlock new possibilities.
-
Embrace the Challenge: You collaborate shoulder-to-shoulder when the stakes are high.
-
Responsibility: You own your commitments, deliver on time, and keep teammates aligned.
-
Dedication: You dive head-first into tough problems, iterating until they’re solved.
-
Collaboration: You communicate clearly, share knowledge freely, and build together.
Why Koast.ai?
-
Early-Stage Impact
Your work will define our architecture and ship features that 100+ customers rely on every day. -
AI & Ads at Scale
Join the frontier of AI-powered media buying - supercharge budgets and decision-making in real time for some of the best ad teams in the world. -
Growth & Ownership
Start as a contractor, grow into a full-time role, and potentially earn equity. -
Remote & Flexible
Work from anywhere on your schedule—just deliver high-quality code (and have fun doing it!).
