I’m looking for a senior full-stack developer to help me build a private, action-capable AI platform that integrates with business systems such as BigChange, Outlook (Microsoft Graph), Google Drive, and later Xero, using OpenAI as a reasoning engine.
This is not a chatbot or prompt-engineering project. It’s a secure internal SaaS-style system with real write access to APIs.
What the platform will do
Chat-style interface (similar to ChatGPT)
Secure user login and role-based permissions
Interpret user intent via OpenAI
Execute validated actions via APIs (e.g. create purchase orders in BigChange)
Read/write data to external systems (BigChange required, Xero later)
Store knowledge and precedent in a vector database
Allow file uploads and document ingestion
Full audit logging and approval workflows
Designed to be extended and improved over time
Required experience (non-negotiable)
Senior full-stack development experience (5+ years)
Strong API integration experience (REST, OAuth, webhooks)
Experience with OpenAI / LLM APIs in production systems
Clear understanding of secure backend architecture
Experience building SaaS platforms or internal tools
Comfortable designing systems where AI plans but backend executes
Preferred tech stack (flexible but indicative)
Frontend: React / Next.js
Backend: Python (FastAPI) or Node.js (NestJS)
Databases: PostgreSQL, Redis
Vector DB: Pinecone / Qdrant / Weaviate
Auth: OAuth / JWT
Cloud: AWS / GCP / Azure
Very important
OpenAI must not hold API keys or perform actions directly
All actions must be validated and executed by the backend
Accuracy, safety, and auditability matter more than speed
Nice to have
Microsoft Graph API experience
Accounting or FM system integrations
Experience building approval workflows
Product-minded approach (not just coding to spec)
Engagement
Initial build: 6–8 weeks
Ongoing improvement work expected
Looking for someone I can work with long-term
Please do not apply if you only build chatbots, landing pages, or no-code automations.
Bilingual Consultancy Website + Resource Library Category: Amazon Web Services, Backend Development, CI / CD, Cloud Security, CMS, Dynamics, Frontend Development, SEO Writing, System Administration, Web Security Budget: $8 - $15 USD
09-Feb-2026 11:00 GMT
European Investor Database Research Category: Data Analysis, Data Collection, Data Entry, Database Management, Excel, Lead Generation, Research, Web Search Budget: €30 - €250 EUR
B2B Social Media Design and Video Editing Category: Adobe Creative Suite, B2B Marketing, Content Creation, Graphic Design, Social Media Marketing, Video Editing, Video Production, Video Services Budget: ₹600 - ₹1500 INR
09-Feb-2026 10:59 GMT
Indian Accent Male Voiceover Artist Category: Audio Production, Audio Services, Customer Service, Hindi Translator, Voice Acting, Voice Assistance Devices, Voice Over, Voice Talent Budget: ₹400 - ₹750 INR
09-Feb-2026 10:58 GMT
Metal Rescue Tower Review and Stamp Category: AutoCAD, Building Engineering, CAD / CAM, Civil Engineering, Construction Engineering, Engineering, Project Management, Safety Consulting Budget: $250 - $750 USD
09-Feb-2026 10:58 GMT
Databricks Architect for Data Engineering Category: Architecture, Big Data, Cloud Computing, Data Analytics, Data Architecture, Data Integration, Data Management, Data Processing Budget: ₹750 - ₹1250 INR
09-Feb-2026 10:57 GMT
ICE Raids: fear as a feature not a bug Community Impact Essay Category: Article Writing, Content Writing, Essay Writing, Ghostwriting, Immigration Law, Journalism, Non Fiction Writing, Public Relations, Research Writing, Technical Writing Budget: $250 - $750 USD
Public Consultation Report Category: Consulting, Data Analysis, Data Collection, Grant Writing, Public Relations, Qualitative Research, Report Writing, Research Budget: £1500 - £3000 GBP