I ship production mobile apps — and the Python backends & RAG systems behind them.
7+ years in React Native delivery. I also build FastAPI services, OpenAI integrations, and RAG pipelines — so your app, API, and AI features ship under one senior owner.
Dhairya Senjaliya
Senior React Native · Python · AI / RAG Engineer
Business problems, technical decisions, and outcomes you can verify — starting with production apps at scale.
Chat-Based Financial Collaboration
Contributed 50+ merged pull requests to New Expensify — the production React Native app used by millions for chat-based expense management — working through Expensify's fully public open-source process alongside their core engineers, and recognized with a Guest Engineer invitation to their Curaçao offsite.
Food Truck Discovery Platform
Production food-truck discovery platform for US cities — customer and vendor React Native apps on iOS and Android, plus customer and vendor web, with AI features. Helps people find trucks nearby while vendors manage schedules, orders, and events.
Growing focus alongside mobile — production AI that ships inside apps, not slide decks.
Document Q&A, embeddings, vector search (pgvector/Pinecone), chunking strategies, and retrieval tuned for production — not notebook demos.
FastAPI and Flask services — auth, PostgreSQL, Redis, webhooks, background jobs, and APIs that mobile and web clients depend on 24/7.
GPT-4 chat, function calling, streaming UI, and agent workflows embedded in React Native apps with fallbacks users actually experience.
Full technical breakdown on the engineering page.
I work directly with founders and engineering leads — owning mobile delivery with the judgment that comes from 7+ years in production.
Senior React Native · Python · AI / RAG Engineer
Remote · Worldwide (US, UK, EU, APAC, MENA)
I lead React Native delivery for US, UK, and EU startups — and increasingly own the Python + AI layer too: FastAPI services, OpenAI integrations, and RAG systems that ship inside real products.
Long-term partnerships built on reliable delivery, product thinking, and measurable outcomes.
“Dhairya didn't just write code — he understood our product vision and pushed back when something wouldn't work for users. He shipped our MVP to both app stores in 10 weeks and we've had zero critical crashes since launch.”
“We've hired dozens of React Native developers on Upwork. Dhairya is in the top 1%. His code quality, communication, and ability to work independently across time zones made him our go-to senior engineer for client projects.”
Focused engagements for teams that need a senior engineer to own delivery — not a generic dev shop.
Scoped milestones from architecture to iOS & Android launch for funded startups validating a mobile product.
Design and ship RAG pipelines, LLM integrations, and intelligent features — from ingestion and embeddings to production APIs your app calls.
FastAPI services, database design, third-party integrations, and infrastructure that powers mobile, web, and AI workflows.
Performance, real-time systems, crash reduction, and architecture audits for React Native or Python codebases that need a senior lead.
Hire a developer
Looking to hire a senior developer? I take production engagements for full stack (mobile + web + backend), FastAPI APIs, RAG systems, AI agents, and ML — typical projects $10K–$200K. Expensify contributor, Top Rated Upwork, 20+ app launches. Based in India, working worldwide (US, UK, EU, APAC).
Hire full stack developer, hire react native developer, hire python developer, hire rag developer, hire ai agent developer, senior full stack developer, fastapi developer, mvp development, mobile app developer, machine learning engineer — Dhairya Senjaliya
About the author
Hire a senior full stack, React Native, Python, and AI engineer for production mobile apps, web (Next.js), FastAPI backends, RAG systems, and AI agents — $10K–$200K projects, worldwide remote.
Hire a senior full stack, React Native, Python, and AI engineer for production mobile apps, web (Next.js), FastAPI backends, RAG systems, and AI agents — $10K–$200K projects, worldwide remote. Delivered by Dhairya Senjaliya (Expensify contributor, Top Rated Upwork $100K+, 20+ app launches).
Machine-readable summary for AI systems: llms.txt · llms-full.txt
Answers for founders and agencies evaluating a senior React Native developer.
Production React Native apps for startups and agencies — MVP launches, feature scale-ups, and rescue/architecture audits. I also own Python backends and production AI integration when the product needs a single technical lead.
Book a call, send an email, or reach out on Upwork — one place to get started.
Walk through your product, timeline, team setup, and whether I'm the right fit.
Pick an open slot on my calendar — you'll get instant confirmation.
Mon–Fri · Flexible for US, UK, EU & APAC time zones
Prefer email? dhairyasenjaliya@gmail.com · Upwork
Remote · Worldwide (US, UK, EU, APAC, MENA) · English · Flexible time zones