Senior Full-Stack Engineer — AI-Driven Marketplace Platform

Linkby; United States; Remote; USD 120,000 - 190,000; Full time

Benefits offered by this job

Competitive salary + equity package

Flexible remote work + optional office

Generous paid time off

Health & wellness benefits

Opportunities for fast growth

High autonomy and ownership

Job summary

Linkby is a remote-first adtech startup building an AI-native publishing marketplace. We’re seeking a Senior Full Stack Developer to own features from database to UI, mentor teammates, and influence architecture over the next 12–24 months.

You’ll ship end-to-end features, deploy on AWS, and build AI-powered capabilities like semantic matching between brands and publishers. We value fast delivery, security, and thoughtful trade-offs in a high-velocity environment.

Qualifications

• Proficiency in both front-end (JavaScript/TypeScript, Vue/React) and back-end (Node.js, Golang) technologies.
• Fluency in databases (PostgreSQL, Clickhouse), APIs (REST/GraphQL), and cloud infrastructure (AWS/GCP).
• Real experience directing agentic coding workflows: you’ve used tools like Cursor or Claude Code to scaffold entire features, caught the subtle bugs they introduce, and know where they reliably fall short.
• Proficiency operating in both human-in-the-loop and human-on-the-loop paradigms - you know when a task needs you steering every step versus when you set constraints and let an agent run, then review the output.
• Strong understanding of software engineering principles, design patterns, and best practices - AI tools make you faster, but you know what’s happening under the hood.
• Experience integrating LLM APIs or ML models into production applications - not just calling an endpoint, but handling prompt management, output validation, cost control, and graceful degradation.
• Comfort working in fast-moving environments: you bias for shipping, iterate quickly, and bring others along with you.
• Bonus: background in adtech, programmatic advertising, or marketplace platforms with proven track record in developing and scaling high-traffic, large-scale applications.

Responsibilities

• Design and implement high-quality, scalable and resilient web applications.
• Ship features end-to-end in partnership with product managers and designers: design APIs, optimize queries, polish UI and own the outcomes.
• Deploy and manage cloud-native applications on AWS, ensuring high availability, performance, and security.
• Contribute to and influence architecture decisions that will shape how we scale the marketplace over the next 12–24 months.
• Build AI-powered platform capabilities - semantic matching between brands and publishers, in-app agents, campaign performance prediction, etc.
• Keep the platform fast, reliable, and secure under load; proactively address bottlenecks and production issues.
• Implement security best practices (e.g. OWASP guidelines) and ensure compliance with data privacy regulations (e.g. GDPR, CCPA) across all development stages, including secure coding, data encryption, and access control.
• Drive continuous improvement through code reviews, agentic workflows, automated testing, and CI/CD practices.
• Mentor teammates through code reviews, pairing, and career development.

Skills

JavaScript/TypeScript

Vue/React

Node.js

Golang

PostgreSQL

GraphQL/REST

AWS

CI/CD

Tools

Cursor

Claude Code

Job description

Linkby is a remote-first adtech startup building an AI-native publishing marketplace. We’re seeking a Senior Full Stack Developer to own features from database to UI, mentor teammates, and influence architecture over the next 12–24 months.

You’ll ship end-to-end features, deploy on AWS, and build AI-powered capabilities like semantic matching between brands and publishers. We value fast delivery, security, and thoughtful trade-offs in a high-velocity environment.