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Senior Full-Stack Developer

Digital Ninjas
Australia

Apply Now

Job Details

Full-time

Qualifications

CRM software
Data modelling
SQL
Database design
PostgreSQL
Fundraising
GitHub
APIs
SaaS
AI

Full Job Description

Australia

Full-time

About The Role

We are looking for a senior full-stack developer to help build and scale SMSNinja, a modern messaging platform designed for charities and fundraising teams.

SMSNinja combines two-way SMS, AI-assisted reply drafting, and team review workflows to help organisations manage supporter conversations more effectively. We are rebuilding the platform on a modern multi-tenant architecture and need an experienced developer who can help turn a strong foundation into a reliable production product.

This is a hands-on role for someone who is comfortable working across frontend, backend, database design, third-party integrations, and production delivery.

What You’ll Work On

Build new product features across the messaging inbox, admin tools, and settings flows
Improve and extend AI-assisted workflows for drafting and reviewing SMS replies
Develop background job and processing flows for async tasks, retries, and syncing
Integrate and harden webhook-driven systems such as Twilio
Design and ship database migrations to support new functionality safely
Improve reliability, observability, and operational safety across the platform
Support fundraising-related integrations and related product workflows
Help shape the product architecture as the platform grows

Our Stack

Next.js
React
TypeScript
Supabase
PostgreSQL / SQL migrations
Tailwind CSS
Twilio
OpenAI APIs
Vercel

What We’re Looking For

Strong experience building production web applications with TypeScript and React
Comfortable using AI to increase workflow velocity
Strong experience with Next.js
Confidence working on both frontend product work and backend application logic
Solid experience with relational databases, schema design, and migrations
Experience integrating third-party APIs and webhook-based systems
Ability to debug production issues and ship pragmatic fixes quickly
Comfortable owning work end to end, from implementation through rollout

Strong Advantages

Experience with Supabase
Experience with Twilio or other messaging platforms
Experience with queue or job processing systems
Experience building multi-tenant SaaS products
Experience working with AI-powered product features
Experience in fundraising, nonprofit tech, CRM, or supporter engagement tools

What Success Looks Like

In this role, you’ll help take an already-started platform and move it forward through the next phase of delivery. That means shipping reliably, improving system quality, and making sound product and technical decisions without creating unnecessary complexity.

You should be someone who can:

work independently
make sensible technical tradeoffs
communicate clearly
keep momentum without cutting corners on important platform concerns like auth, tenant isolation, and integration reliability

Ideal Profile

You’re likely a strong fit if you:

enjoy building real products, not just prototypes
can move between UI, APIs, data modeling, and infrastructure concerns
are pragmatic, fast, and technically rigorous
are comfortable in an evolving product environment
like taking ownership of meaningful product and platform work

Engagement

Open to contract, fractional, or the right longer-term arrangement depending on fit and availability.

To Apply

Please apply using the form below and include:

– a short introduction

– links to relevant projects or GitHub work

– a summary of your experience with Next.js, TypeScript, and backend/product delivery

– any relevant experience with messaging, AI workflows, or fundraising/nonprofit platforms

Apply Now

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