Available for Select SaaS & AI Architecture Initiatives

Engineering Mission-Critical SaaS, AI & Mobile Systems

I'm Kuldeep Singh, a Principal Full-Stack Engineer and Systems Architect with 18+ years building production software. I design systems for maintainability, predictable scaling, and controlled technical debt, staying hands-on through implementation, database tuning, and deployment.

Discuss Your Project View Case Studies Hire on Upwork (Top Rated Plus)

18+

Years In Production

6,300+

Upwork Hours

4.8/5

Rating (42 Contracts)

Top Rated+

Upwork Status

kuldeep-architecture.ts — prod-env

v18.0 Production

                import { SaaSEngineering, ProductionRAG } from '@systems/core';
                 
                // Hands-On Technical Authority (2008 – Present)
                export const architectProfile = {
                  lead: 'Kuldeep Singh (mrsadioura)',
                  corePillars: [
                    'SaaS Product Engineering',
                    'AI / RAG / Automation',
                    'React Native Mobile',
                    'Backend & Distributed Systems'
                  ],
                  handsOnImplementation: true,
                  controlledTechnicalDebt: true
                };
                 
                export async function solveBottlenecks() {
                  return 'Ready to take ownership of your critical software outcome.';
                }
              

Kuldeep Singh

Independent Systems Architect • Collaborating with US, UK & Global Tech Teams

Commercial Relevance

Problems I Get Called In To Solve

Clients don't hire frameworks. They bring me in when software is technically difficult, commercially critical, and somebody senior needs to own the outcome.

SaaS Platforms Hitting Scale Ceilings

Queries taking 10+ seconds, runaway cloud bills, and database connection exhaustion under customer concurrency. I audit the data path, profile bottlenecks, and implement indexing, caching, and queueing.

AI Prototypes That Hallucinate in Production

Replacing fragile naive vector wrappers with production-grade RAG: semantic chunking, pgvector HNSW indexing, cross-encoder reranking, and verbatim citation guardrails.

React Native Performance & Background Crashes

Resolving JavaScript thread blocking, timer drift, battery drainage, and background service termination on iOS and Android with custom native bridges and MMKV storage.

Early MVPs Needing Enterprise Production Architecture

Transforming rapidly built prototypes into hardened, multi-tenant architectures with role-based access control (RBAC), database isolation, and clean CI/CD pipelines.

Offline-First & Field Data Synchronization

Applications that must operate flawlessly in zero-connectivity environments, reconciling complex mutation queues and high-resolution photo payloads upon reconnection.

Race Conditions in Billing, Webhooks & Telemetry

Eliminating duplicate payments, dropped carrier activations, and race conditions with atomic Redis key locking, BullMQ worker queues, and idempotent pipelines.

18+ Years In Production

2008 – Present

Senior Technical Authority

Architecture First. Hands-On Execution.

I bridge the gap between high-level architectural strategy and hands-on code execution. I design systems for maintainability, predictable scaling, and controlled technical debt, while staying hands-on through implementation and deployment.

Whether it is engineering carrier-grade telecom backends for Moolah Wireless, building patented IoT geofencing platforms for GeoLock & GeoCampus, or architecting secure enterprise document ERPs for institutions like ICICI Bank, KFC, and Flipkart, I build software that stands up to production reality.

1. SaaS Product Engineering

Multi-tenant database schemas, Stripe/Razorpay billing, enterprise RBAC, and Next.js.

2. AI / RAG / Automation

pgvector HNSW, semantic chunking, cross-encoder reranking, and citation guardrails.

3. React Native Mobile

Low-power geofencing, hardware timers, offline MMKV storage, and 60 FPS UI.

4. Backend & Scaling

High-throughput Node.js APIs, BullMQ worker queues, Redis hot-caching, and PostgreSQL.

Discuss Your Project Explore Services Subsystem

Evidence-Based Showcase

Selected Engineering Case Studies

Presented by the concrete business problem solved, the architectural strategy chosen, and the measurable production outcome.

AI & RAG Architecture >97% Precision

Production RAG Document Intelligence

Enterprise AI

Enterprise document intelligence engine with pgvector, semantic chunking, and deterministic citation guardrails.

Problem Naive vector search on corporate PDFs hallucinated, lost table structure, and lacked verifiable citations.

Approach Hierarchical chunking with PostgreSQL pgvector HNSW indexing, Cohere cross-encoder reranker, and citation regex validation.

Outcome >97% retrieval accuracy with sub-1.4s end-to-end response time and 100% verbatim source attribution.

Python FastAPI PostgreSQL pgvector Cohere Rerank OpenAI LangChain

Read Case Study Page

React Native Mobile 60 FPS Native

RepPilot

Mobile Systems

High-performance fitness tracking application with millisecond-accurate interval timers and real-time community chat.

Problem JavaScript event loops drifted workout timers by seconds, and apps crashed inside concrete gym basements.

Approach Hardware monotonic clock native bridges in Swift and Kotlin, paired with MMKV storage and Reanimated 3.

Outcome Sub-15ms timer precision, rock-solid 60 FPS transitions, and full offline streak persistence across iOS & Android.

React Native TypeScript MMKV Storage XMPP Chat Reanimated 3

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Telecom OS & SaaS 100k+ Devices

Moolah Wireless

Carrier Grade

Carrier-grade mobile OS backend and automated SIM provisioning pipeline for a nationwide telecom device distributor.

Problem High-latency data balance deductions and race conditions during concurrent bulk SIM provisioning.

Approach Event-driven Node.js & MySQL microservices with Redis hot-caching and BullMQ idempotent webhook queues.

Outcome Maintained 99.98% uptime SLA with sub-65ms quota check latency across 100k+ active connected devices.

Node.js MySQL Cluster AWS EC2/S3 Redis BullMQ

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EdTech & IoT US Patented

GeoLock & GeoCampus

US Patent

Patented distraction-free learning and parenting platform featuring dynamic safe-zones and real-time school lockdown modes.

Problem Standard continuous GPS polling drained mobile batteries in 4 hours, and OS background killers terminated services.

Approach Tiered motion-triggered sensing architecture with React Native native bridges and MongoDB 2dsphere indexing.

Outcome Awarded United States Patent; operates throughout an entire school day consuming under 5% total phone battery.

React Native Swift/Kotlin Bridges Node.js MongoDB 2dsphere AWS IoT

Read Engineering Case Study

Offline PWA & GIS 100% Offline

Offline Field Data PWA

Industrial PWA

Industrial environmental inspection PWA operating in remote zero-connectivity zones with client photo compression.

Problem Field inspectors lost multi-point polygon audits when cellular dropped, and multi-megabyte photos broke uploads.

Approach Constructed Dexie.js IndexedDB local storage, client Web Worker photo compression, and MapLibre offline vector tiles.

Outcome Cut sync payload sizes by over 85% with resilient background sync to Supabase (PostgreSQL RLS).

Next.js PWA Dexie IndexedDB MapLibre GL Supabase RLS Web Workers

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B2B SaaS Analytics 3.5x Speedup

SQOR.io Analytics

SaaS Cockpit

Real-time B2B analytics platform unifying CRM, MRR telemetry, and predictive churn forecasting alerts.

Problem Disparate metrics across tools; cohort calculations took 12+ seconds and froze mobile browsers.

Approach Next.js React frontend with virtualized HTML5 canvas charting, backed by asynchronous Python statistics workers.

Outcome 3.5x faster query performance rendering 50,000+ data points smoothly with real-time Slack anomaly bots.

Next.js Python FastData Node.js PostgreSQL HTML5 Canvas

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Explore All 8 Architectural Case Studies

Senior Delivery Model

How I Work With Engineering Leaders

A disciplined, predictable framework designed for clarity, transparency, and rapid delivery.

Discovery & Architecture

Reviewing domain models, constraints, and scalability targets before writing code.

Technical Specification

Documenting schema design, API contracts, security bounds, and state machines.

Milestone Planning

Breaking delivery into weekly, reviewable milestones with clear acceptance criteria.

Hands-On Implementation

Clean, typed, maintainable coding executed directly by me with daily git commits.

Automated Testing & CI/CD

Unit, integration, and end-to-end pipeline verification preventing regressions.

Staging & Review

Interactive walkthroughs on isolated staging instances with client stakeholders.

Production Deployment

Zero-downtime rolling releases, database migrations, and health check monitoring.

Monitoring & Iteration

Log aggregations, error tracking (Sentry), query profiling, and performance tuning.

Direct Senior Engagement Guarantee

I work directly with founders, CTOs, and product teams. I remain hands-on with the code and architecture rather than handing development over to an unknown junior team.

Collaboration Options

Flexible Engagement Models

Tailored to your current stage, whether you need targeted architectural advisory or comprehensive product delivery.

Advisory

Architecture Consultation

For technical reviews, codebase audits, database indexing, and migration roadmaps.

3 to 5-day deep code audit
Written report & prioritized fixes
Live architectural debrief

Book Consultation

Delivery

Project Engagement

For building a defined platform, production RAG engine, MVP, or major subsystem from scratch to production.

Fixed milestone deliverables
Weekly staging releases
Full IP and code handover

Discuss Scope

Ongoing

Engineering Retainer

Dedicated monthly senior engineering capacity (20–40 hrs/week) for high-growth SaaS and product iteration.

Direct sprint participation
Rapid feature engineering
Production triage & on-call

Inquire on Availability

Leadership

Fractional CTO

Strategic technical leadership and architecture guidance for startups without a full-time CTO.

Technical strategy & stack design
Hiring & technical vetting
Board & investor advisory

Discuss Leadership

Career Milestones

18+ Years of Production Engineering Impact

A timeline of senior leadership, architecting SaaS platforms, and shipping critical systems.

2020 — PRESENT (6+ YEARS)

Principal Full Stack Engineer & AI Solutions Architect

Independent Consultant • Global Tech Clients

Architecting enterprise SaaS platforms, AI/RAG automation pipelines, and high-concurrency cloud systems for US, UK, and European clients.

Architected carrier-grade backend APIs for Moolah Wireless, scaling across 100,000+ connected devices with 99.98% uptime SLA.
Engineered the low-power tracking engine for GeoLock & GeoCampus, recognized with an awarded United States Patent.
Developed production RAG systems with PostgreSQL pgvector HNSW indexing, cross-encoder reranking, and citation guardrails.
Top Rated Plus on Upwork with 6,300+ tracked engineering hours and 4.8/5.0 verified client feedback across 42 contracts.

2015 — 2020 (5 YEARS)

Senior Full Stack & Systems Architect

Enterprise Solutions & High-Growth Tech

Led full-stack engineering designing compliance-heavy platforms, document management ERPs, and high-speed web services.

Built enterprise document ERP platform VR SecureDocs deployed across institutional clients including ICICI Bank, KFC, and Flipkart.
Led migration of legacy backends to decoupled microservices using Node.js, Docker, and AWS RDS.
Engineered high-throughput multi-country travel SaaS portals with real-time inventory synchronization.

2008 — 2015 (7 YEARS)

Software Engineer & Web Applications Developer

Digital Consultancies & Software Firms

Developed dynamic web portals, database-driven applications, and custom CMS/e-commerce architectures during the rise of modern web frameworks.

Delivered 150+ custom web applications, e-commerce stores, and high-volume portals using PHP, JavaScript, and MySQL.
Pioneered cross-browser responsive interfaces and payment gateway integrations (PayPal, Authorize.Net, Stripe).
Optimized relational databases through query normalization, indexing, and server-level caching.

ACADEMIC FOUNDATION

Bachelor of Technology (B.Tech) in Computer Science & Engineering

Information Technology & Distributed Computing

Comprehensive academic foundation in Data Structures, Algorithms, Computer Networks, Operating Systems, and Distributed Computing.

Verified Client Feedback

Feedback from Founders & Engineering Leaders

Verified reviews from clients who brought me in to architect and ship their software.

"Kuldeep is an experienced full stack software engineer and his contributions to our work at Moolah have helped us grow and scale our technology. We will continue to build and work with Kuldeep on projects into the future. He is also a great communicator and team leader."

Telecom Engineering Leadership

Moolah Wireless Inc. (Verified Upwork Review)

"Awesome experience as always! The site looks and works just how I pictured it—super happy with how it all turned out. Completed in just a couple of days and was always available to solve issues promptly."

Founder, AITools Platform

AI Categorization & Prompt Directory

"Kuldeep was extremely helpful and knowledgeable when it came to creating our front-end application. Originally my understanding was the process would be quite difficult, however he executed it cleanly into a high-performance web app."

Product Lead, US SaaS

Identity withheld under NDA (Verified Upwork Contract)

"Kuldeep is very knowledgeable, good communicator, and fast. Delivered our OpenAI API pipeline ahead of schedule with great architectural advice."

Founder, AI Startup

Verified Upwork Review

"Very skilled, competent, and professional. He managed the desktop, web, and mobile versions simultaneously with great attention to detail. Would hire again."

Technical Founder

Desktop & Mobile Productivity Platform

"A++++++++++++++++++++ Work. Amazing problem solving skills. Because of your work we were able to do our LIVE launch successfully. Thanks a ton Kuldeep!"

Technical Director

Live Product Launch

Let's Connect

Ready to Architect Something Exceptional?

Whether you need end-to-end SaaS engineering, an AI integration pipeline, or high-level architectural advisory, I'm ready to discuss your goals.

Direct Communication

I respond promptly to technical inquiries, project scopes, and retainer proposals.

Direct Email

[email protected]

Upwork Profile (Top Rated Plus)

Hire Directly on Upwork (6,300+ hrs, 4.8★)

Profiles & Code

GitHub • LinkedIn

Current Local Time Chandigarh, India (Remote Available)

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