[ENGINEERING DOSSIER] · SERIES 2026 · REF: MS-BACKEND
CLASSIFICATION: PUBLIC · VERIFIED
MUSTAFA SHAIKH
Senior Backend Engineer — Distributed Systems, Event Architecture & Data Integrity
Islamabad, Pakistan · Remote (UTC+5) · Open to Relocation
// ABSTRACT
I build backend systems that stay correct when the network doesn't. Event-driven services, offline-first sync, and data models engineered to survive production partitions without financial drift. Six years across regulated fintech, B2B marketplaces, and offline retail infrastructure.
01 // Operational Status & Availability
TABLE 1.0| Parameter | Specification | Details |
|---|---|---|
| Engagement Target | Senior Backend Engineer / Distributed Systems | High-integrity transactional systems |
| Primary Architecture | Event-driven dispatch, BullMQ, offline-first sync, PostgreSQL schemas | TypeScript, Java, Go, AWS |
| Current Deployment | NoreOS — Solo-architected offline-first retail operating system | Live at noreos.com ↗ |
| Work Mode & Terms | Remote (async-aligned worldwide) or Relocation-ready | Timezone: PKT (UTC+5) |
| Direct Channels | [email protected] | Download Résumé [PDF] ↓ |
02 // Selected Systems & Architectural Case Studies
Production backend systems engineered under real network partitions and strict data consistency gates.
| Ref | System & Role | Timeline | Architectural Scope & Invariants | State | Dossier |
|---|---|---|---|---|---|
| 01 | NoreOS Founder & Solo Architect | 2024 – Present | Offline-first retail operating system. Local durable mutation queues, strict schema-per-tenant PostgreSQL isolation, 80% coverage gate (535 tests + 396 E2E flows), 10 script-correct locales. | Live (noreos.com) | Read → |
| 02 | AIO Dispatch Senior Backend Engineer | 2025 – Present | Real-time at-least-once order delivery across ~500 production devices. BullMQ persistence, Redis Pub/Sub routing, SSE device ACK, 6-hour auto-recovery backoff, 10K connection load test. | In Production | Read → |
| 03 | Fintech & B2B Software Engineer | 2022 – 2024 | Monolith to microservices migration at Small World Financial Services; centralized i18n platform; serverless PII chat masking and automated dispute resolution at Dastgyr. | Production Shipped | Read → |
FIG. 01 // DISTRIBUTED SERVICE TOPOLOGY
BUFFERED QUEUE · SCHEMA ISOLATION · LIVE TOPOLOGY
TOPOLOGY MODEL: EVENT-DRIVEN BUS RENDER: STATIC BLUEPRINT
03 // Field Notes & Technical Specifications
Essays on failure handling, idempotency design, and offline data models.
| Ref | Title & Core Invariant | Date | Length | Document |
|---|---|---|---|---|
| 01 | At-least-once delivery is easy; exactly-once is a product decision Idempotency Keys · Device ACK · Retry Budgets | OCT 2025 | 6 min read | Read → |
| 02 | Offline-first is a data-model problem, not a sync button Local Queues · Schema-per-Tenant · Tombstones | AUG 2025 | 8 min read | Read → |
| 03 | Designing for the six-hour outage Heartbeat Pipelines · AWS IoT · Exponential Backoff | JUN 2025 | 7 min read | Read → |
// COMMUNICATION PROTOCOL
Have a hard distributed systems problem?
I am available for senior backend engineering roles focusing on reliability, data models, and high-load event dispatch.