Hi, I'm Deepak Singh.
Principal Mobile Engineer · iOS & React Native
12+ years shipping production iOS apps — from AI voice systems and on-device LLMs to BLE/IoT and consumer apps with millions of users.
Apps I've shipped
Selected iOS apps spanning healthcare, AI, IoT, audio, and consumer rewards. All currently available on the App Store.
All-in-one AI platform automating clinical workflows. I lead iOS for audio recording, PCM streaming, realtime speech-to-text, translation, and OpenAI voice integration.
View on App Store →Consumer rewards platform with 5M+ users. Built and maintained iOS apps spanning video streaming, surveys, feedback, and a B2B advertising framework distributed to partners.
View on App Store →Manage and optimize WiSA HT speakers, SoundSend, and Dolby Atmos audio systems. Built BLE and SwiftUI-based control workflows for ESP32 microcontrollers and WiSA transmitters.
View on App Store →IoT-driven workplace safety platform. Engineered offline-first workflows recording millions of sensor data points per day and uploading to cloud streaming pipelines.
View on App Store →Doctor-facing app for Asia's largest dental chain. Built socket-based realtime communication, Core Data persistence, secure cloud file storage, and multi-clinic scheduling.
View on App Store →Patient-facing companion to Clove Doctor. Built appointment booking, secure file uploads, REST integration, and offline caching for the consumer experience across Indian metros.
View on App Store →Experience
Twelve years across consumer, healthcare, IoT, and AI — from individual contributor to engineering leadership.
Principal iOS Engineer
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.
Senior iOS Developer
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.
Sr. iOS Developer
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.
Side projects on GitHub
Personal projects where I explore modern iOS, on-device AI, and clean architecture.
Debrief
On-device meeting notes
iOS app that records meetings, transcribes audio via Apple's Speech framework, and generates structured AI notes — action items, decisions, summaries — powered by Qwen 2.5 1.5B and Phi-2 running entirely on-device via GGUF inference. No cloud, no accounts, no data leaves the phone.
ThreadAI
Branching AI chat
Production-quality iOS AI chat with branching sub-thread conversations — fork any message into a sub-thread with full parent context, nested arbitrarily deep. Streaming responses, markdown + syntax highlighting, Keychain-stored API keys, MVVM + Clean Architecture.
More on GitHub → github.com/dsngeu
Skills
What I reach for day-to-day — sharpened over a decade of production iOS work.
Languages & Frameworks
Architecture
AI & Realtime
IoT & Hardware
Release & DevOps
Productivity & AI Tooling
Education
Master's in Computer Science
Looking for a Principal / Staff iOS Engineer?
I'm open to senior iOS, mobile architecture, and engineering leadership roles. Happy to talk about AI-powered mobile, BLE/IoT, healthcare, or anything ambitious.