You will get AI RAG with pgvector and FastAPI (Semantic Search, Embeddings, OpenAI)
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Top Rated
Project details
Production-ready RAG and semantic search for documents, knowledge bases, and product corpora. I deliver retrieval pipelines that actually return the right answer with citations. Recent shipped work: MyAnswer AI PDF Manager (chat with PDF, DOC, DOCX, PPTX, PPT, TXT; per-chat scope; education and counseling use cases). Notesight AI transcription with WhisperX, async processing, and semantic search. FastAPI plus PostgreSQL plus pgvector reference backend (JWT auth, embeddings, vector similarity recommendations with cosine distance, Alembic migrations, Python three point thirteen). What you get: Document ingestion (PDF, DOCX, web, transcripts) with chunking, deduplication, and metadata. Embeddings via OpenAI, Cohere, or open-source models. Storage in pgvector, Pinecone, or Weaviate with metadata filters. Hybrid search (vector and lexical), rerankers, and answer synthesis with citations. FastAPI or NestJS query API with rate limits and audit logs. Tests, Docker, and CI ready for AWS or Vercel.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$700
|
Standard
$2,200
|
Advanced
$4,500
|
|---|---|---|---|
| Delivery Time | 5 days | 14 days | 25 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
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HG
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Jan 22, 2026
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Edgard W.
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Dominik G.
Dec 26, 2025
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Really enjoyed working with this developer. Communication was easy, fast, and straight to the point. He understood what I needed very quickly and delivered exactly what we discussed - often even better than expected.
What stood out most was his problem-solving mindset. Instead of just following instructions, he actively thought along, suggested improvements, and helped avoid potential issues early on.
Everything was delivered on time, changes were handled quickly, and the overall collaboration felt relaxed and efficient. No unnecessary back and forth - just solid work and great results.
Would definitely work with him again and highly recommend him.
What stood out most was his problem-solving mindset. Instead of just following instructions, he actively thought along, suggested improvements, and helped avoid potential issues early on.
Everything was delivered on time, changes were handled quickly, and the overall collaboration felt relaxed and efficient. No unnecessary back and forth - just solid work and great results.
Would definitely work with him again and highly recommend him.
CH
Cliffe H.
Dec 2, 2024
Full Stack Developer for Next.js Line of Business web app
Alex was great to work with! He is very knowledgeable and did an admirable job getting our application up and running. He was flexible with the work assigned, and was able to complete all that was asked of him with proficiency. We would definitely work with Alex again!
IA
Inktank A.
Mar 3, 2023
Need Angular Frontend Developer for educational platform. Cross-platform web and mobile Development
About Alexander
React Native Developer | Mobile App Developer | iOS Android Expo
100%
Job Success
Zaporizhia, Ukraine - 7:55 pm local time
I've spent thousands of hours building exactly that: React Native + Expo iOS/Android clients, Node and NestJS services, Python where the pipeline or AI piece belongs on the server, PostgreSQL / MongoDB / GraphQL data layers. Repeat clients, hire-again rate around 85%.
The work has spanned SaaS (including a Product Hunt Product of the Year workspace product), mobile at real scale (fitness and audio platforms with very large user bases), banking and healthcare-style flows, marketplaces, and open source. Production AI shipped where it earned its keep: video transcription, segmentation, async processing.
What I deliver:
- React Native + Expo mobile apps, iOS and Android, App Store and Play Store ready
- Full-stack ownership: React frontend, Node and NestJS backend, TypeScript end-to-end
- Python services when the AI or data pipeline lives on the server
- Production-ready apps with auth, APIs, testing, and ops
Tech stack: React Native, Expo, React, Next.js, Node.js, NestJS, TypeScript, Python, PostgreSQL, MongoDB, GraphQL.
Senior React Native Developer, React Native Developer, Mobile App Developer, React Developer, Full Stack Developer, iOS Developer, Android Developer, TypeScript Developer, Node.js Developer.
Steps for completing your project
After purchasing the project, send requirements so Alexander can start the project.
Delivery time starts when Alexander receives requirements from you.
Alexander works on your project following the steps below.
Revisions may occur after the delivery date.
Corpus and retrieval design
Pick embeddings model, vector store, chunking strategy, and query API shape. Define citations, access scoping, and eval set.
Evals, deploy, hand off
Run eval set, fix retrieval quality, deploy to AWS or Vercel, hand off with runbook and dashboard for monitoring.