Custom Mission-Critical Systems Engineering
Turn complex domain requirements into resilient, mathematically verifiable production platforms. Specializing in offline-first native Android POS, clinical compliance ledgers, and sub-20ms edge architectures.
Built with Industrial-Grade Mathematical Correctness
Offline-First Local Persistence
SQLite Write-Ahead Logging (WAL) and FIFO transactional sync outboxes ensure your software runs 100% offline with zero lost transactions during cloud network failures.
64-Bit Integer Currency Math
Say goodbye to floating-point drift. All financial calculations, invoice subtotals, and GST/tax lines are computed using integer paisa arithmetic with formal invariant assertions.
Tamper-Evident WORM Ledgers
Immutable append-only audit ledgers cryptographically verified via SHA-256 blocks for healthcare regulatory compliance (CDSCO/NABH) and financial audit readiness.
The 8-Week 0-to-1 Production Sprint
Domain Modeling & RFC Blueprint
We define strict type-safe domain entities, state transition machines, database schemas, and API contracts before touching UI pixels.
Core Invariants & Persistence Engine
Implementation of core business logic, database migrations, outbox synchronization queues, and automated Vitest/Jest unit invariant suites.
High-Density UI & Real-Time Integration
Polished, keyboard-first administrative dashboards, mobile native views (Android Jetpack Compose), and sub-20ms edge synchronization.
Production Hardening & Sovereign Handover
Edge CDN configuration, rate limiting, zero-trust telemetry, full IP transfer, and comprehensive engineering team documentation.
Systems Built from Scratch
RetailOS — Offline-First POS
Engineered in Kotlin & Jetpack Compose with Room SQLite, transactional sync outbox, zero-float financial ledgers, and ESC/POS thermal printing.
RxCompliance — Clinical AST Engine
Python FastAPI and PostgreSQL architecture with dynamic AST rules, Drug-Drug Interaction clinical decision support, and append-only WORM ledgers.
Custom Systems Build FAQ
How fast can an MVP or custom system be built?
A typical 0-to-1 mission-critical platform is engineered and deployed to production within 6 to 8 weeks. We eliminate agency bloat by moving directly from architectural domain contracts to production-ready code with continuous automated CI/CD verification.
Who owns the intellectual property and codebase?
You own 100% of all intellectual property, source code, commit history, and design assets. There are zero proprietary runtime dependencies or vendor lock-ins. All code is transferred directly to your organization’s private GitHub or GitLab repository.
How is this different from working with a traditional software agency?
Traditional agencies assign junior developers who learn on your dime, resulting in superficial code with fragile architectures and hidden bugs. Here, you work directly with a seasoned systems architect who designs the data model, writes the core invariants, and ensures enterprise-grade resilience from Day 1.
What happens after the system is launched?
Every build concludes with comprehensive architectural documentation, database ER diagrams, and a structured handover workshop for your incoming engineering team. Ongoing fractional CTO advisory or technical governance is available to support your team through post-launch scaling.
What technology stacks do you specialize in?
We select the highest-leverage modern technologies: Next.js 15, TypeScript, Cloudflare Edge Workers / D1 SQL, PostgreSQL (Drizzle / Prisma), Python FastAPI for AST engines, and Kotlin / Jetpack Compose with Room SQLite for offline-first Android systems.
Commission a Custom System Build
Direct line to Harvinder Singh. Outline your project concept, target launch milestone, or technical specifications. I will review and confirm a 1-on-1 executive briefing call.
I work with ambitious founders, engineering leads, and fast-moving teams to build reliable 0-to-1 platforms, resolve system bottlenecks, and architect clean software that scales.
Whether you need an MVP built from scratch, a deep codebase review, or full-stack technical leadership, feel free to reach out.
Send a Message
Select what you're looking for and drop your details. I read and respond to every note.