Senior Full-Stack SaaS Lead Developer

About BeautyScale
BeautyScale is the leading growth partner in the beauty industry, working with ambitious brands and some of the world's most influential retailers and distributors across 50+ markets. Our platform combines retail distribution, investment, an AI-powered sales platform, and premium industry intelligence.
Our next growth engine is BeautyScale AI CRM, a production SaaS designed to help beauty teams manage sales, communication, campaigns, tasks, meetings, analytics, and AI-assisted workflows from one platform.
The Role
You will take hands-on technical ownership of BeautyScale AI CRM. Your primary responsibility is to strengthen, scale, and continuously improve a live multi-tenant SaaS used by commercial teams. You will work directly with the founders, make pragmatic architecture decisions, and ship reliable features across the frontend, backend, AI services, infrastructure, and integrations. This is not a coordination-only role.
What You'll Do
• Own the technical roadmap, architecture, delivery, and production reliability of BeautyScale AI CRM.
• Build end-to-end features across React and TypeScript, Go APIs, and our C# AI service.
• Improve AI agents, RAG, vector search, tool execution, memory, and human approval workflows.
• Design secure multi-tenant systems using PostgreSQL, pgvector, Redis, and background workers.
• Maintain Docker and Railway deployments connected to GitHub, including health checks and observability.
• Build and maintain integrations with email, calendars, communication tools, billing systems, APIs, and webhooks.
• Write tested, maintainable code, review changes, document decisions, and resolve production issues quickly.
• Contribute when needed to Central, our internal commercial and operations platform.
What We're Looking For
• Minimum 5 years of professional full-stack software development experience.
• Required: you have personally built or led a production SaaS used by paying customers.
• Strong production experience with Go and React with TypeScript.
• Experience with C# and ASP.NET Core is a strong advantage.
• Strong knowledge of PostgreSQL, Redis, background jobs, APIs, authentication, and multi-tenant architecture.
• Production experience with Docker, Railway or a comparable cloud platform, and GitHub workflows.
• Practical experience integrating LLM APIs, RAG, agents, vector search, or AI-powered product features.
• Strong judgment on security, performance, testing, observability, and production reliability.
• Excellent spoken and written English, with clear technical communication.
• Based in the Philippines and available full-time and exclusively for BeautyScale.
• Highly autonomous, product-minded, accountable, and comfortable working directly with founders.
How to Apply
Apply through LinkedIn and answer every screening question precisely. Send your CV, LinkedIn profile, GitHub profile, and links to SaaS products or technical work you personally built. Briefly explain your role, the stack, the number of users or paying customers, and what you owned in production.
You may also contact apply@beauty-scale.co or WhatsApp +33 7 66 36 59 33.
Our process includes a 30-minute interview followed by a practical technical assessment.

Work arrangement
No