Full Stack Engineer Apas.ai

Skills / Requirements

• AI-coding Tools
• Application security
• Automated Testing
• Claude Code
• Codex
• Identity Management
• Multi-tenant SaaS
• Node.js
• OAuth 2.0
• OpenID Connect
• OWASP Top 10
• Performance Tuning
• Python
• React
• Relational Database Design
• Responsive Web Design
• REST API
• Single Sign-On
• TypeScript
• Vibe Coding
• Vulnerability Testing

Why Apply

This role is ideal for someone adept at using AI coding tools like Claude Code and Codex to accelerate development. You'll need to refine AI-generated code, ensuring it's secure and production-ready, which aligns perfectly with vibe coding practices.

What You'll Be Doing

You'll transform a working prototype into a market-ready application, focusing on security and scalability. This involves identity management, authentication, and ensuring the application runs smoothly on desktops and iPads. Post-launch, you'll incorporate user feedback and enhance the product.

Pay and Career Growth

You'll work closely with the founders, providing a direct line to decision-making and influence over the product's direction. The role offers the opportunity to grow with the company as the team expands post-MVP. Compensation specifics aren't provided, but the role's responsibilities suggest a competitive package.

Benefits and Perks

• Collaboration with founders
• competitive salary
• Growth Opportunities
• Remote Work

Is This Role Right for You?

Original Job Description

Role
We have a B2B software tool that is 70–80% built using AI-assisted (“vibe-coded”) development. Your job is to take it to MVP: harden it, secure it, and get it ready for market with real user load.
This role is 100% focused on this one product. You’ll own the path from working prototype to production-ready application, including identity management, authentication, authorization, single sign-on, security, and vulnerability testing. Where the existing code holds up, you’ll build on it. Where it doesn’t, you’ll be prepared to rebuild parts of it from scratch.
The product is a web application only for Phase 1, which takes it from prototype to MVP. No native desktop or mobile apps (iPhone, Android, or App Store downloads) are in scope for this phase. It must work well in modern browsers on desktop and on iPad, since many of our users work from iPads.
After MVP, we want you to stay on and help scale the product as we grow the team around it. Once we go to market and get real customer feedback, your work will be to:

Incorporate customer feedback into the product

Fix anything that breaks, quickly and reliably

Build new features and help scale the product as the company grows
You’ll work directly with the founders. You’ll be expected to identify trade-offs, write them down, and explain them clearly so we can make decisions quickly. You’ll also document every meaningful code change so the product stays maintainable as the team grows.
DevOps and infrastructure are already in place. This is a full-stack application development role.

Employment
This is a full-time position of 40 hours per week. You will be employed in Brazil through our employer of record, working for APAS.AI or its sister company, both based in the United States.

Must Have
Experience

5+ years of hands-on full-stack development experience

Proven experience building at least one application from start to finish, from initial architecture through production release to real users

Experience maintaining a live production application: debugging issues, shipping fixes, and releasing new features based on user feedback
Technical

Strong proficiency in modern web development: a front-end framework (e.g., React), a back-end language (e.g., Node.js/TypeScript or Python), and REST/JSON API design

Responsive web design that works well on desktop browsers and iPad, including touch interactions and testing on iPad Safari

Relational database design and operation: schema design, migrations, indexing, query optimization, and data integrity

Multi-tenant SaaS architecture: isolating each customer organization’s data, users, and permissions within one platform

Identity management, authentication, and authorization, including role-based access control, OAuth 2.0, and OpenID Connect

Single sign-on implementation (SAML, OIDC, or providers such as Okta, Microsoft Entra ID, or Auth0)

Application security: secure coding practices, OWASP Top 10, input validation, session management, secrets handling, and encryption in transit and at rest

Vulnerability testing and remediation: dependency scanning, static analysis, and fixing issues found in security testing

Audit logging of user actions and access events

Automated testing: unit, integration, and end-to-end tests, with enough coverage to ship changes safely

Preparing applications for real-world user load: performance tuning, scalability, and load testing

Third-party API integration (identity providers, email, and other external services)

Regular, hands-on use of AI coding tools such as Claude Code and Codex to speed up development, with the judgement to review, test, and correct what they produce

Comfortable taking over AI-generated code, hardening it, and rebuilding components from scratch when that’s the better option
Communication and documentation

Ability to identify software trade-offs, write them up clearly, and recommend a path forward

Strong written and verbal communication skills in English

Strong documentation habits: clear commit messages, change logs, and written records of code changes and design decisions

Available for real-time collaboration with a team on US Eastern Time for part of each workday

Nice to Have

SOC 2 or similar security compliance experience (useful after MVP, when selling to larger customers)

Security certifications or formal penetration testing background (e.g., OSCP)

Experience building LLM-powered product features (e.g., retrieval-augmented generation, AI assistants)

Subscription billing integration (e.g., Stripe)

Accessibility standards (WCAG)

Progressive web app (PWA) experience, such as offline support for iPad users

Location
Brazil, Remote