AI SaaS Developer

Stealth Manager - White Label Agency; Brasil; Remote; BRL 180,000 - 300,000; Full time

Job summary

Stealth Manager - White Label Agency is seeking an AI SaaS Developer to design, build, and launch AI-powered software products from the ground up. The role focuses on full-stack engineering, AI integrations, and SaaS delivery to support digital marketing and advertising automation.

You will own the product lifecycle from concept to launch and continuous improvement, building AI tools for ad research, campaign automation, and analytics, while ensuring security, scalability, and cost efficiency in

Qualifications

• 4+ years of full-stack software development experience, including at least one SaaS product launched to paying customers.
• Strong proficiency in TypeScript/JavaScript and/or Python.
• Experience with modern web frameworks such as Next.js, React, or FastAPI.
• Hands-on experience with LLM APIs, including prompt engineering, tool use, and AI agents.
• Experience building or deploying MCP servers, or strong API integration experience with the ability to learn MCP quickly.
• Experience with Meta Marketing API or another advertising API, such as Google Ads or TikTok Ads.
• Experience with OAuth, subscription billing platforms such as Stripe, databases, and cloud hosting.
• Strong written communication skills and the ability to work independently in a remote environment.

Responsibilities

• Own product development from idea and technical specification to prototype, launch, and ongoing improvement.
• Build full-stack SaaS applications, including web interfaces, user accounts, databases, background jobs, and AI-powered features.
• Develop AI agents, prompts, and workflows using LLM APIs such as OpenAI and Anthropic Claude.
• Build MCP servers and integrations with advertising platforms and APIs, including Meta Marketing API and Meta Ad Library API.
• Implement subscriptions, billing, free trials, access levels, and integrations with checkout systems, CRMs, and course platforms.
• Develop data collection, search, reporting, and AI-driven recommendation features.
• Ensure product reliability, security, scalability, and compliance with platform requirements.
• Implement safeguards for advertising automation, including paused-by-default ads, budget limits, approval steps, and spend alerts.
• Monitor product usage, resolve bugs, manage technical support escalations, and optimize AI, API, hosting, and data costs.
• Create product documentation, user guides, and training materials for internal teams.
• Collaborate with cross-functional teams to define requirements, prioritize features, and prepare products for launch.
• Maintain a visible product roadmap and backlog, share regular progress updates, and report key product metrics.

Skills

Full-stack development

SaaS product experience

TypeScript/JavaScript

Python

LLM APIs

API integrations

Remote work

Tools

Next.js

React

FastAPI

Stripe

Meta Marketing API

Google Ads

TikTok Ads

Job description

AI SaaS Developer

About the Role

We’re looking for an AI SaaS Developer to design, build, and launch AI-powered software products from the ground up. This role is ideal for a hands-on developer who enjoys turning ideas into real products, combining full-stack engineering, AI integrations, and SaaS development to solve practical business problems.

You’ll own the product lifecycle from initial concept and prototyping to launch, paying users, and continuous improvement, with a focus on digital marketing, affiliate marketing, and advertising automation.

What You’ll Build

• AI Ad Research Tools: Searchable ad libraries, AI-powered ad analysis, ad copy generation, and trend alerts to help affiliate marketers identify opportunities and improve campaign performance.
• AI Advertising Automation: Tools that connect AI assistants to advertising platforms, allowing users to create and manage Facebook and Instagram campaigns through natural-language instructions, with safeguards and approval workflows.

These are examples of initial projects. You’ll also develop new AI SaaS products as business opportunities emerge.

Key Responsibilities

• Own product development from idea and technical specification to prototype, launch, and ongoing improvement.
• Build full-stack SaaS applications, including web interfaces, user accounts, databases, background jobs, and AI-powered features.
• Develop AI agents, prompts, and workflows using LLM APIs such as OpenAI and Anthropic Claude.
• Build MCP servers and integrations with advertising platforms and APIs, including Meta Marketing API and Meta Ad Library API.
• Implement subscriptions, billing, free trials, access levels, and integrations with checkout systems, CRMs, and course platforms.
• Develop data collection, search, reporting, and AI-driven recommendation features.
• Ensure product reliability, security, scalability, and compliance with platform requirements.
• Implement safeguards for advertising automation, including paused-by-default ads, budget limits, approval steps, and spend alerts.
• Monitor product usage, resolve bugs, manage technical support escalations, and optimize AI, API, hosting, and data costs.
• Create product documentation, user guides, and training materials for internal teams.
• Collaborate with cross-functional teams to define requirements, prioritize features, and prepare products for launch.
• Maintain a visible product roadmap and backlog, share regular progress updates, and report key product metrics.

Requirements

• 4+ years of full-stack software development experience, including at least one SaaS product launched to paying customers.
• Strong proficiency in TypeScript/JavaScript and/or Python.
• Experience with modern web frameworks such as Next.js, React, or FastAPI.
• Hands-on experience with LLM APIs, including prompt engineering, tool use, and AI agents.
• Experience building or deploying MCP servers, or strong API integration experience with the ability to learn MCP quickly.
• Experience with Meta Marketing API or another advertising API, such as Google Ads or TikTok Ads.
• Experience with OAuth, subscription billing platforms such as Stripe, databases, and cloud hosting.
• Strong written communication skills and the ability to work independently in a remote environment.

Nice to Have

• Experience building data collection pipelines, search systems such as Elasticsearch, or vector databases at scale.
• Hands-on experience running Facebook ads or working in affiliate marketing.
• Experience navigating Meta App Review.
• A portfolio or GitHub showcasing AI-powered or advertising technology products in production.

How Success Is Measured

• Product milestones delivered against the roadmap.
• Active users, paying subscribers, retention, and cancellations.
• Product reliability, uptime, and error rates.
• Bug resolution and support response times.
• AI, API, data, and hosting costs per paying user.

4+ years of full-stack software development experience, including at least one SaaS product launched to paying customers., Strong proficiency in TypeScript/JavaScript and/or Python., Experience with modern web frameworks such as Next.js, React, or FastAPI., Hands-on experience with LLM APIs, including prompt engineering, tool use, and AI agents., Experience building or deploying MCP servers, or strong API integration experience with the ability to learn MCP quickly., Experience with Meta Marketing API or another advertising API, such as Google Ads or TikTok Ads., Experience with OAuth, subscription billing platforms such as Stripe, databases, and cloud hosting., Strong written communication skills and the ability to work independently in a remote environment.