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 to Expensify's production React Native platform used by millions for expense management and team collaboration — recognized with a Guest Engineer invitation to Curaçao.
Food Truck Discovery Platform
Production food truck discovery platform for US cities — consumer app helping users find trucks nearby, plus a companion vendor app for schedules, orders, and event management. Live on iOS, Android, and web.
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.
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