Senior Full Stack Developer – SaaS & AI - with vibe coding experience

Semcom Visual Communication; Sydney; Hybrid; AUD 140,000 - 180,000; Full time

Job summary

Semcom Visual Communication in Sydney is seeking a senior full stack developer to build and scale a SaaS platform with a focus on security, performance, and multi-tenant architecture.

You’ll work on frontend and backend systems, integrate AI-assisted development tools, review code, and guide projects from design through deployment in a hybrid Sydney-based role with possible remote work across Australia.

Qualifications

• Experience building and scaling SaaS platforms with strong security practices.
• Ability to review AI-generated code and work within an existing codebase.
• Strong autonomy and ability to guide projects from design to deployment.

Responsibilities

• Build and evolve new systems to support business teams.
• Review architecture for performance, security, and scalability.
• Implement multi-tenant data separation and secure permissions.
• Develop frontend/backend functionality and integrate third-party APIs.
• Introduce automated testing and continuous improvement.

Skills

React

TypeScript

JavaScript

Node.js

PostgreSQL

SQL

Supabase

REST APIs

Webhooks

Multi-tenant SaaS

Authentication

Application security

Git

GitHub

Tools

Lovable

Cursor

Replit

Bolt

AI-assisted development tools

Job description

Senior Full Stack Developer - SaaS & AI - with vibe coding experience

Semcom Visual Communication - Sydney CBD NSW

Sydney | Contract / Full-Time | 3-12 Months

We are looking for an experienced Senior Full Stack / SaaS Developer to help further develop, scale and secure an advanced proprietary business platform.

Candidates should be experienced in building, improving and developing internal, client‑facing and supplier‑facing workflow management, procurement, reporting, logistics and business automation software and be experienced with working with vibe coding tools as well as traditional coding.

What You'll Do

• Build and develop new systems as required by the business teams
• Review and improve the existing application architecture
• Strengthen security, authentication, MFA and permissions
• Review multi-tenant data separation and Row Level Security
• Secure database, file storage, APIs and backend functions
• Build and maintain third-party integrations
• Improve performance, scalability and maintainability
• Refactor and develop frontend/backend functionality
• Introduce automated and security testing
• Provide ongoing technical guidance

Skills We're Looking For

Strong experience with:

• React / TypeScript / JavaScript
• Node.js
• PostgreSQL / SQL
• Supabase or similar backend platforms
• REST APIs / Webhooks
• Multi-tenant SaaS architecture
• Authentication and role‑based permissions
• Application security
• Git / GitHub

AI-Assisted Development Experience

Experience with modern AI-assisted development tools such as Lovable, Cursor, Replit, Bolt or similar platforms is highly desirable.

However, we are not looking for someone whose experience is limited to prompting AI tools.

You should be comfortable:

• Reviewing AI-generated code
• Working directly in an existing codebase
• Debugging independently
• Writing custom application logic
• Writing SQL
• Creating secure database policies
• Building backend functions
• Integrating external APIs
• Refactoring code where required
• Reviewing application security independently

We are looking for someone who can combine the speed of modern AI-assisted development with proper software engineering discipline.

Engagement

Initial engagement is expected to be approximately 3-6 months, with the potential for an ongoing relationship.

Sydney‑based candidates are preferred, as we would require you to work initially from our offices in Pyrmont to understand the needs and requirements of the business, followed by a hyrid working model thereafter. Strong remote candidates within Australia may also be considered.

About You

You are a senior, hands‑on developer who can work independently, understand business workflows quickly and combine modern AI-assisted development with strong software engineering discipline.

We are ideally looking for an experienced individual developer or consultant rather than a large agency.

You can find out more about our business at www.sem.com.au