Pengjia Z.

I help businesses automate repetitive work, repair software, and deliver focused web and mobile features. I am a senior machine learning engineer and data scientist, and founder of Traft NZ Limited. My background includes enterprise AI, natural language processing, data engineering, cloud systems and software integration. Services you can hire me for: AUTOMATION & DATA • API integrations and workflow automation: connect systems, synchronize data, and automate one clearly defined process. • Excel and CSV scripts: clean, merge, validate, transform and export data. • PDF and document extraction: turn agreed document formats into structured data. • Automated reports and presentations: generate recurring outputs from your data and approved templates. AI & SOFTWARE ENGINEERING • RAG and AI agent pilots: connect a defined knowledge source or tool workflow, with evaluation and clear acceptance criteria. • Technical audits and feasibility reviews: investigate code, architecture or automation opportunities and provide actionable findings. • Bug fixes, regression tests and deployment repairs: diagnose and resolve a specific issue. WEBSITES & WEB APPS • Features for existing web applications: API connections, exports, admin screens and workflow improvements. • Responsive landing pages with your content, branding, forms and deployment. • Business websites and CMS setup with an agreed page count. • Internal web apps and PWAs for a defined business workflow, roles and data. MOBILE APPS • Features and repairs for existing mobile apps, including API integration. • Tightly scoped cross-platform mobile MVPs, or paid discovery to define a realistic first release. I prefer small, well-defined projects with useful deliverables: working code, appropriate tests, setup instructions and a clear handover. We agree inputs, scope and acceptance criteria before implementation. For larger ideas, I can start with an audit, discovery milestone or one focused pilot. Tell me what you need to change, what systems or files are involved, and what a successful result looks like.