Open to principal / staff iOS & AI engineering roles

Hi, I'm Deepak Singh.

Principal Engineer · iOS & AI Full-Stack

12+ years shipping production iOS apps — from AI voice systems and BLE/IoT to consumer apps with millions of users. Now also building AI full-stack products in production — agentic RAG and analytics platforms in Python, TypeScript and PostgreSQL.

Noida, India Instant Systems, Inc. 12+ yrs experience
Deepak Singh
📱 6 apps live
⭐ 147K+ ratings
12+
Years building iOS
6+
Apps shipped to App Store
5M+
Users reached
147K+
App Store ratings on shipped work
AI Full-Stack · 2026 — Present

AI products in production

Backend and full-stack AI systems I design, build, deploy and support — using Claude Code and OpenAI Codex as coding agents while owning architecture, specs, code review and production.

💬
In production

Insy.ai

Agentic RAG HR assistant · Odoo ERP

An AI assistant inside the company's production Odoo 14 HR ERP that answers employee HR-policy questions. Policy Word documents are parsed, chunked, embedded with OpenAI and searched with pgvector; agent tool calling adds live ERP data — leave balances, profile, manager, HR partner and buddy. Answers stay private to the logged-in employee. Shipped as a separate module with an admin console and a web/mobile chat widget, without changing any of the ~64 existing production modules.

PythonPostgreSQLpgvectorRAGTool CallingOpenAIOdoo
📊
In production

VaSi.ai (Learnee)

Operations & business analytics platform

One view for Learnee's leadership of system health, API traffic, search-cluster capacity, usage patterns, revenue, expenses and app users. A Firebase Functions backend in TypeScript runs scheduled agents that pull from Cloud Logging, BigQuery/GA4, Elasticsearch and Learnee's own APIs, apply rules, and store results in PostgreSQL. Rules decide what's wrong; Claude only explains it — with fixed-text fallbacks and role-based JWT access per module.

TypeScriptFirebase FunctionsBigQueryCloud LoggingElasticsearchPostgreSQLClaude
Live on the App Store

Apps I've shipped

Selected iOS apps spanning healthcare, AI, IoT, audio, and consumer rewards. All currently available on the App Store.

Career

Experience

Twelve years across consumer, healthcare, IoT, and AI — from individual contributor to engineering leadership, and from iOS into AI full-stack.

2026 — Present
Alongside iOS lead

AI Full-Stack Engineer

Instant Systems, Inc.Noida · Hybrid

Expanded from iOS into backend and full-stack AI — building and running AI products in Python, TypeScript and PostgreSQL, with Claude Code and OpenAI Codex as coding agents.

  • Insy.ai — agentic RAG HR assistant (in production). Built the retrieval pipeline (document parsing, chunking, OpenAI embeddings, pgvector search) and agent tool calling over live ERP data inside the company's Odoo 14 HR ERP, shipped as an isolated module without touching ~64 existing production modules.
  • VaSi.ai (Learnee) — analytics platform (in production). Built a Firebase Functions backend of scheduled agents pulling from Cloud Logging, BigQuery/GA4, Elasticsearch and internal APIs into PostgreSQL, with rule-based monitoring, Claude-written explanations with fallbacks, and JWT role-based access.
  • Own the full lifecycle — architecture, specs and implementation plans, code review of agent-written code, deployment and production support.
PythonTypeScriptPostgreSQLpgvectorRAGFirebase FunctionsGoogle CloudClaude CodeOpenAI Codex
Oct 2021 — Present
5 yrs

Principal iOS Engineer

Instant Systems, Inc.Noida · Hybrid

Lead the iOS practice across two flagship products — Sully.ai (AI clinical assistant) and WiSA (wireless audio hardware) — owning team direction, technical architecture, and stakeholder partnership end-to-end.

  • Lead the Sully.ai iOS team of 3 — own roadmap prioritization, release planning, and stakeholder alignment. Decide what ships each cycle based on customer impact and engineering risk; close the loop with product, design, backend, and clinical operations.
  • Hired to fix Sully.ai's critical audio-corruption issue — shipped the fix. Rebuilt the audio capture and PCM streaming layer (AVAudioEngine + WebSockets) to deliver clean recordings into the OpenAI realtime transcription, translation, and clinical-note pipeline.
  • Built a reusable Swift BLE framework for WiSA (IC) — abstracts ESP32 microcontroller and WiSA transmitter communication into a clean API. Powers the iOS app that controls WiSA-ready hardware across 40+ audio brands including Bang & Olufsen, Harman Kardon, Klipsch, and LG.
  • Client-facing technical lead — run discovery and architecture conversations directly with WiSA stakeholders. Translate audio-hardware constraints into mobile workflows and push back on scope when timelines aren't realistic.
  • Cut release prep from 1+ hour of manual work to a single-click deploy by automating signing, TestFlight, and App Store delivery via Fastlane + GitHub Actions.
  • Established production observability — introduced LogRocket + Firebase structured logging, audio-pipeline instrumentation, and a triage rotation that surfaces issues before users report them.
  • Standardized AI-augmented workflows (Cursor, Claude, MCP) across the iOS team — accelerating code review, debugging, and documentation.
SwiftSwiftUIAVFoundationOpenAIWebSocketsPCM StreamingTwilioBLEESP32VIPERClean ArchitectureFirebaseFastlaneReact Native
Oct 2017 — Dec 2021
4 yrs 3 mos

Senior iOS Developer

Instant Systems, Inc.Noida

Took two products from zero to App Store while growing from individual contributor to team lead — culminating in managing a cross-platform mobile team and owning client relationships.

  • FactorLab / SmartTagIt — built and led mobile (iOS + Android). Took SmartTagIt from zero to App Store as the iOS owner, then expanded into managing a 3-person cross-platform mobile team. Ran planning, code review, hiring input, and direct client communication.
  • IoT data pipeline at scale — engineered offline-first iOS workflows capturing millions of sensor data points per day with background uploads to cloud streaming infrastructure. Chose Realm over Core Data after benchmarking — write-heavy sensor data made the difference.
  • Clove Dental — shipped Patient & Doctor apps from scratch. Owned the full lifecycle: architecture, REST + socket-based realtime communication, Core Data persistence, secure cloud file storage, App Store submission, and post-launch iteration. Apps power Asia's largest dental chain.
  • Technical voice in client meetings — defined scope, estimated, surfaced risk early, and proposed alternatives when requirements clashed with mobile platform realities.
  • Built patterns that outlived the project — reusable networking, caching, and crash-debugging conventions adopted as the default starting point for new iOS work.
SwiftUIKitCore DataRealmMVVMSocketsBackground UploadsFirebase
Jan 2014 — Nov 2017
3 yrs 11 mos

iOS Engineer

TechAheadNoida · On-site

Contributed to Swagbucks (5M+ users) and reusable framework components spanning video streaming, surveys, feedback, advertising monetization, and partner integrations.

  • Developed and maintained multiple production iOS applications using Swift, UIKit, Objective-C, VIPER, REST APIs, and iOS SDK frameworks.
  • Built and optimized video streaming workflows for high-volume media consumption — improving playback experience, loading performance, and stability.
  • Designed feedback and survey features using VIPER, improving user interaction and structured data collection.
  • Developed and maintained an advertising iOS framework distributed to B2B partners for monetization integrations.
  • Built reusable UI components, networking layers, and shared utilities to support faster feature development across multiple apps.
SwiftObjective-CUIKitVIPERVideo StreamingB2B SDK
Toolkit

Skills

A decade of production iOS depth, plus the backend and AI stack I ship with today.

🧩

Languages & Frameworks

Swift SwiftUI UIKit Objective-C React Native TypeScript Expo Expo Modules AVFoundation Combine Core Data Realm
🗄️

Backend & Data

Python TypeScript PostgreSQL pgvector Firebase Functions Firebase Hosting BigQuery Cloud Logging Cloud SQL Elasticsearch JWT & Role-Based Access Server Deployment
🏛️

Architecture

Clean Architecture MVVM VIPER MVC Coordinator Dependency Injection Modular Design
🤖

AI & Realtime

OpenAI APIs On-device LLMs (GGUF) SFSpeechRecognizer PCM Streaming WebSockets Twilio RAG Agentic AI / Tool Calling Claude API Prompt Design
📡

IoT & Hardware

BLE ESP32 WiSA Background Uploads Sensor Pipelines Offline-first
🚀

Release & DevOps

GitHub Actions Fastlane TestFlight App Store Connect Firebase LogRocket XCTest
⚡

Productivity & AI Tooling

Cursor Claude Code OpenAI Codex MCP Workflows Code Review at scale Mentoring
Background

Education

Master of Computer Applications (MCA)

Graphic Era University
2011 — 2014

Bachelor of Computer Applications (BCA)

HNB University
2008 — 2011
Let's work together

Looking for a Principal iOS or AI Full-Stack Engineer?

I'm open to principal / staff iOS, AI full-stack, and engineering leadership roles. Happy to talk about AI-powered products, RAG and agents, realtime audio, BLE/IoT, healthcare, or anything ambitious.