Software Developer · 2019 – Present

HadiZulfiqar.

Software Developer with continuous commercial production experience from 2019 to Present. Specializing in high-throughput C# and ASP.NET Core backends, distributed Kafka event pipelines, SQL internals, and fast bespoke web platforms with zero bloat.

Software Dev (2019–Now) C# & .NET 9 ASP.NET Core Kafka & RabbitMQ SQL Server Tuning Core Web Vitals
hadi-developer-profile.cs
public sealed class DeveloperProfile
{
    public string Track => "Software Developer (2019 – Present)";
    public string Focus => "High-Throughput C# & Distributed Systems";
    public string Runtime => "ASP.NET Core 9 · Event Architecture";

    public async ValueTask ExecuteAsync()
    {
        // High-throughput C# & Distributed Architecture
        await _pipeline.DispatchAsync();
    }
}
2019 Active Developer in Production
2019
Software Developer Since
7+
Years in Production
40+
Production Deliveries
77+
Peer-Reviewed Guides

Experience

2022 – Present
Mangobaz IT Solutions
Lead Developer

Senior Software Developer & Systems Architect

  • Architected and delivered mission-critical web applications, high-throughput REST APIs, and microservices for enterprise and global clients.
  • Engineered transactional outbox patterns over Apache Kafka and RabbitMQ, guaranteeing strictly-once delivery semantics for high-concurrency event buses.
  • Eliminated database bottlenecks across Microsoft SQL Server: tuned B-Tree indexes, mitigated lock contention, and reduced P99 latency below 10ms.
  • Constructed zero-allocation C# memory pipelines utilizing ArrayPool<T> and Span<T>, shaving 65% off memory GC pressure.
  • Authored automated chaos-testing runbooks and CI/CD pipelines deploying to Docker and Windows Server (IIS).
⚡ Scaled distributed architectures to 45,000 operations/sec with 99.9% production reliability.
2019 – 2022
Software Engineering
Full-Stack

Software Developer

  • Designed, programmed, and maintained full-stack web applications utilizing ASP.NET Core, C#, Entity Framework Core, SQL Server, and modern JavaScript.
  • Constructed fast, mobile-first, and responsive web user interfaces adhering to Core Web Vitals with sub-second page loads.
  • Implemented semantic JSON-LD schema markup (Organization, WebSite, BlogPosting, BreadcrumbList) driving 70%+ organic search growth.
  • Refactored legacy modules into clean, decoupled, and testable architectures with automated unit and integration tests.

Skills & Technologies

Backend & Distributed Systems
ASP.NET Core 8 / 9 & Modern C# Runtime
Distributed Messaging (Apache Kafka, RabbitMQ, Outbox)
SQL Internals (Index Tuning, B-Trees, Execution Plans)
Distributed Caching (Redis, TinyLFU, Cache Stampede Mitigation)
Windows Server (IIS), Docker & Linux Deployments
Web Performance & Client Workbench
Core Web Vitals Optimization (INP, LCP, CLS < 50ms)
Handcrafted Vanilla HTML5 & Modern CSS Design Systems
WebAssembly & Web Crypto APIs (Zero-Server Utilities)
Technical SEO Architecture & JSON-LD Schema Systems
Responsive Cross-Browser Layouts (Mobile-First)
Software Dev Since 2019 High-Throughput C# ASP.NET Core SQL Server & SQLite Kafka Outbox Razor Pages Core Web Vitals IIS & Docker Web Crypto API

Editorial Spotlight

Demystifying DNS Internals & Anycast Routing: BGP Convergence, DNSSEC, and Global Edge Failover The Web Stack
· By Hadi Zulfiqar · ✓ Peer-Reviewed

Demystifying DNS Internals & Anycast Routing: BGP Convergence, DNSSEC, and Global Edge Failover

A deep systems engineering guide to the architecture of internet routing and domain resolution. We examine how BGP Anycast routes global traffic across hundreds of edge data centers on a single IP address, dissect the DNS resolution lifecycle and EDNS Client Subnet (ECS) geo-steering, verify the DNSSEC cryptographic chain of trust, and explain why BGP route withdrawal achieves sub-second failover where DNS TTLs fail.

Read Full Deep-Dive →
Building a Vector Search Engine from Scratch: HNSW Graphs, Cosine Distance, and Quantization Learn to Code
· By Hadi Zulfiqar · ✓ Peer-Reviewed

Building a Vector Search Engine from Scratch: HNSW Graphs, Cosine Distance, and Quantization

A complete systems programming masterclass on constructing a high-performance vector database engine from first principles. We explore multi-dimensional vector spaces, implement SIMD-accelerated cosine and Euclidean distance metrics, build multi-layer Hierarchical Navigable Small World (HNSW) graphs with greedy neighbor descent and heuristic edge pruning, and compress embedding memory footprints by 75% using scalar quantization (SQ8).

Read Full Deep-Dive →

Latest Engineering Guides

Browse All 77 Tutorials →
Backend Systems

Distributed Locking in Practice: Fencing Tokens, Redlock Fallacies, and Raft Leases

A rigorous systems engineering analysis of mutual exclusion in asynchronous distributed systems. We dissect why naive Redis locks and Redlock fail under stop-the-world process pauses and NTP clock jumps, implement Martin Kleppmann's monotonic fencing token architecture, and examine why consensus-backed lease protocols (etcd, Consul, ZooKeeper) are mandatory for safety-critical state mutations.

Frontend Craft

High-Performance WebAssembly in the Browser: 128-Bit SIMD, Multithreading, and Zero-Copy Canvas

An authoritative systems engineering guide to executing compute-intensive algorithms in the browser at near-native speeds. We dissect the WebAssembly linear memory architecture, leverage 128-bit SIMD vector instructions (v128) for 4x floating-point speedups, engineer multi-threaded worker pools over SharedArrayBuffer with Atomics synchronization, and achieve locked 120 FPS rendering via OffscreenCanvas zero-copy blitting.

Studio Notes

Slashing API Tail Latency: How We Reduced p99 Response Times from 480ms to 18ms

A production engineering retrospective on debugging extreme tail latency spikes in high-throughput backend APIs. We dissect why monitoring median (p50) latency creates false confidence, use CPU flame graphs and allocation profilers to isolate Gen 2 Garbage Collection pauses, eliminate heap churn using ArrayPool<T> and Span<byte>, and fix PostgreSQL query plan regressions under heavy concurrency.

The Web Stack

Mastering WebAuthn & Passkeys: Public-Key Ceremonies, CBOR Attestation, and Phishing-Resistant Auth

A cryptographic and architectural masterclass on replacing passwords with FIDO2 WebAuthn passkeys. We examine public-key ceremonies, dissect clientDataJSON and CBOR-encoded authenticatorData, decode COSE elliptic curve public keys, verify ECDSA assertion signatures, and implement a complete, production-grade passkey authentication engine in modern web architectures.

Learn to Code

Building a Resilient Distributed Task Queue from Scratch: Visibility Timeouts, Heartbeats, and Dead-Letter Recovery

A complete systems engineering guide to constructing an enterprise-grade distributed background worker queue. We dissect why naive FIFO message lists fail under node crashes and network partitions, implement dynamic visibility timeouts with asynchronous heartbeat leases, protect worker fleets with full-jitter exponential backoff, isolate poison pills using Dead-Letter Queues (DLQ), and write a production-ready C# async runtime.

Backend Systems

Zero-Downtime Schema Migrations: The Expand/Contract Pattern, Online DDL, and Concurrency Locks

A production systems masterclass on evolving high-throughput relational databases without downtime. We examine the physics of table locks and lock queues in PostgreSQL and MySQL, dissect the 4-phase Expand/Contract (Parallel Run) migration pattern, implement cursor-based batch backfill workers with replication lag throttling, and compare native online DDL with ghost-table engines like gh-ost.

Free Developer Utilities

Zero telemetry, zero server-logging. All calculations and parsing execute 100% inside your browser's local sandbox.

Open Tools Hub (7) →
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JSON Formatter & Validator

Format, inspect, and validate JSON payloads with exact line and column syntax error diagnostics.

Format JSON →
🔑

JWT Token Inspector

Safely decode JWT tokens in your browser. Inspect headers, claims, issuers, and token expiry without server exposure.

Inspect JWT →
💾

SQL Query Formatter

Beautify unformatted SQL statements with standardized keyword capitalization and clause indentation.

Format SQL →
🔒

Cryptographic Hasher

Generate SHA-256, SHA-512, SHA-1, and MD5 hashes instantly using native Web Crypto APIs.

Generate Hash →
⏱

Cron Expression Parser

Translate 5-field cron schedules into plain English sentences and calculate next execution dates.

Parse Cron →
🔍

Regex Pattern Tester

Test and debug regular expressions with live syntax highlighting, capture groups, and flag toggles.

Test Regex →

Career & Education

Software Developer (2019 – Present)
Continuous commercial software engineering track architecting high-throughput backend services, distributed Kafka event pipelines, and SQL internals.
B.Sc. in Computer Science (BSCS)
United States of America (USA) · Computer Science & Systems Architecture Track
Inter
Punjab College (Punjab Group of Colleges), Pakistan

Track Record & Lead

HZ

Hadi Zulfiqar

Software Developer (2019 – Present)

BSCS (USA) · Inter (Punjab College) · Lahore, Pakistan

Actively developing and shipping production software since 2019. Specializing in high-throughput C# and ASP.NET Core backends, distributed Kafka event architectures, SQL index optimization, and ultra-fast bespoke web platforms.

Full-Stack Software Developer in Production (2019 – Present)
BSCS Degree – United States of America
Inter – Punjab College (Punjab Group of Colleges)

Connect with the Editorial Desk

Have an inquiry about an architectural guide, need clarification on a code implementation, want to suggest an engineering breakdown, or discuss bespoke software consulting? Drop our desk a message and we'll respond promptly.

✉
Direct Email team@mangobaz.com
📍
Engineering Desk Lahore, Pakistan · USA Educated
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GitHub Profile github.com/hadizulfiqar3