Cyprian is available for hire
Hire CyprianCyprian Aarons
Verified Expert in Engineering
Python Developer
Harare, Harare Province, Zimbabwe
Toptal member since August 13, 2026
Bio
Cyprian is a senior Python engineer with 8 years of software experience, now focused on applied AI. He builds FastAPI services, API integrations, and retrieval-based LLM workflows with LangGraph and LangChain, and has led small engineering teams as a CTO while staying hands-on in the code. Recent work spans insurance enquiries, healthcare workflows, and operational logistics software.
Portfolio
Self-employed
LangGraph, LangChain, FastAPI, Python, React, Next.js, Fintech, AI Integration...
Africai
Python, Redis, FastAPI, HTML, JavaScript, Automated Testing...
Freelance Clients
Python, FastAPI, Node.js, TypeScript, Vue, React, Next.js, Fintech...
Experience
- Git - 8 years
- Python - 8 years
- FastAPI - 5 years
- Docker - 5 years
- Redis - 5 years
- Retrieval-augmented Generation (RAG) - 4 years
- LangChain - 3 years
- LangGraph - 2 years
Work Experience
Senior AI Engineer
2025 - PRESENT
Self-employed
- Built a retrieval-based insurance enquiry workflow for Zimnat with LangGraph and FastAPI, answering policy, claims, and renewal questions from approved source material.
- Built production AI systems for insurance, healthcare, government, and fintech teams, adapting LangGraph and FastAPI workflows to client infrastructure and compliance constraints.
- Designed a healthcare debt-recovery workflow across voice and messaging channels, separating the conversation layer from protected tool services with tenant and identity checks, audit records, and human handoff.
- Developed Python and FastAPI services on AWS for a psychometric assessment platform for PSC Zimbabwe.
Technologies: LangGraph, LangChain, FastAPI, Python, React, Next.js, Fintech, AI Integration, Amazon Web Services (AWS), AWS Lambda, Back-end, API Architecture, API Design
Chief Technology Officer
2023 - 2025
Africai
- Served as technical owner of an AI platform with a three-developer team, setting architecture, release planning, and CI/CD while writing production Python.
- Reduced API response times with Redis caching, query optimization, and asynchronous Python refactoring, and integrated OpenAI and Stability.ai generation into product workflows.
- Translated priorities from non-technical investors into concrete build plans under significant ambiguity, guiding hands-on delivery across the platform.
Technologies: Python, Redis, FastAPI, HTML, JavaScript, Automated Testing, Large Language Models (LLMs), Agentic AI, SQL, Expo, React Native, Artificial Intelligence (AI), CSS, TypeScript, PostgreSQL, APIs, Full-stack, React, Next.js, Fintech, Amazon Web Services (AWS), Retrieval-augmented Generation (RAG), AWS Lambda, Back-end, API Architecture, API Design
Full-stack Engineer (Contract)
2021 - 2024
Freelance Clients
- Built a React Native/Expo operations app and FastAPI services for CST UK covering reception, deliveries, visitor passes, and devices, with HaloPSA integration, live updates, staff notifications, and health checks.
- Developed back-end functionality for Coindraw, a Web3 competition platform, covering payment, draw, and prize workflows.
- Built real-time Vue dashboards for Vanti on top of Go-based telemetry services for an IoT platform.
- Delivered Solidity smart contracts, DeFi, and NFT platform work for international clients through FreeFlow.
Technologies: Python, FastAPI, Node.js, TypeScript, Vue, React, Next.js, Fintech, AI Integration, API Architecture, API Design, Web, Web Development, eCommerce
Founder/CTO
2018 - 2023
Topiax.xyz
- Founded and led Topiax.xyz to deliver AI, back-end, and full-stack products from discovery through production for clients across insurance, healthcare, fintech, and logistics.
- Architected reusable Python, FastAPI, and TypeScript systems with secure integrations, automated testing, and production delivery practices that shortened the path from ambiguous idea to maintainable software.
- Translated complex business requirements into shipped products and public engineering work, combining hands-on implementation with technical direction, client communication, and long-term platform decisions.
Technologies: Python, FastAPI, Node.js, TypeScript, JavaScript, React, Next.js, Fintech, API Architecture, API Design, Web, Web Development, eCommerce
Lead Engineer
2019 - 2021
Freshideas
- Joined as a senior front-end developer and was promoted to lead engineer, leading a cross-functional team that delivered eCommerce and SaaS products for clients.
- Led technology development for an eCommerce platform service used by major retail companies in Zimbabwe.
- Owned engineering coordination and releases across eCommerce and SaaS client accounts, improving delivery through CI/CD and automated testing.
Technologies: NodeBox, HTML, JavaScript, Artificial Intelligence (AI), Expo, React Native, CSS, TypeScript, PostgreSQL, APIs, Full-stack, React, Next.js, Fintech, Back-end, API Architecture, API Design, Web, Web Development, eCommerce
Project History
AfricAI Generative AI Platform
AfricAI is an AI platform where I served as chief technology officer and technical owner for a three-developer team. I set the architecture, release planning, and CI/CD, and wrote production Python myself. I integrated OpenAI and Stability.ai generation into product workflows behind internal service interfaces, and reduced API response times with Redis caching, query optimization, and asynchronous Python refactoring. I also translated priorities from non-technical investors into concrete build plans under significant ambiguity.
CST Goods-In
https://cyprian.topiax.xyz/work/cstCST Goods-In is a real-time mobile operations platform for visitors, deliveries, passes, devices, and staff notifications. As the senior full-stack contractor, I built a mobile-first React Native and Expo app backed by FastAPI and Supabase, with WebSocket updates and HaloPSA, Slack, and SendGrid integrations. The project centralized front-desk workflows in one app, with live status updates, health checks, and staff alerts so problems surfaced as they happened. It shipped to production for CST UK.
Semai AI Support
https://cyprian.topiax.xyz/work/semaiSemai AI Support is a controlled agentic support system that turns approved business information into useful customer answers while preserving clear human handoff for complaints, sensitive cases, and unresolved questions. I designed the AI workflow, API, retrieval, tool boundaries, escalation behavior, and operator surfaces using Python, FastAPI, LangGraph, LangChain, OpenAI-compatible model access, and React. The system includes knowledge maintenance, conversation review, and feedback loops so teams can improve support safely over time.
MedReclaim AI
https://cyprian.topiax.xyz/work/medreclaimMedReclaim AI is an implementation-ready healthcare debt-recovery platform designed for WhatsApp, Telegram, SMS, voice, and email. As the AI systems architect, I designed the LangGraph gateway and FastAPI tool server with tenant and identity checks, PHI filtering, audit logs, payment and document flows, and human handoff. The architecture separates conversation from sensitive actions so regulated teams can automate useful workflows without uncontrolled decisions.
Education
2017 - 2021
Bachelor's Degree in Software Engineering
Harare Institute of Technology - Harare, Zimbabwe
Skills
Libraries/APIs
Node.js, React, Vue
Tools
Expo, Git
Languages
JavaScript, HTML, CSS, Python, SQL, TypeScript
Frameworks
React Native, Next.js, LangGraph
Paradigms
API Architecture, Automated Testing
Platforms
Amazon Web Services (AWS), Web, Linux, AWS Lambda, Docker
Storage
PostgreSQL, Redis
Other
Software Engineering, Artificial Intelligence (AI), APIs, Large Language Models (LLMs), Agentic AI, Full-stack, API Integration, AI Agents, AI Integration, Retrieval-augmented Generation (RAG), Back-end, API Design, CI/CD Pipelines, Software Architecture, Web Development, Supabase, Fintech, eCommerce, FastAPI, LangChain
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