Senior Full Stack Engineer - North America (Remote)

Linkby•Quebec, QC

3d•$155,000 - $185,000•Remote

About The Position

Linkby is seeking a Senior Full Stack Developer to join their AI-augmented team and help build and scale the next generation of their publishing marketplace. This role involves end-to-end feature ownership, from database to UI, with a focus on shipping high-quality, scalable, and resilient web applications. The developer will collaborate closely with leadership and product managers, contribute to technical direction, and mentor teammates. Key responsibilities include designing and implementing web applications, shipping features end-to-end, deploying and managing cloud-native applications on AWS, influencing architecture decisions, building AI-powered platform capabilities, ensuring platform speed, reliability, and security, implementing security best practices and data privacy compliance, and driving continuous improvement through various development practices. The role emphasizes working in fast-moving environments, shipping quickly, and influencing architecture and system scaling.

Requirements

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. You can articulate why you'd choose one over the other for a given problem.
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 and can debug a production outage at 2 AM without them.
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.
A track record of influencing architecture, scaling systems, and making pragmatic trade-offs.
Strong communication skills: you can advocate for smart technical decisions with leadership, while ensuring the team feels heard and supported.
Valid work authorization in North America.

Nice To Haves

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.