Zonaid H. - Personal Portfolio

zonaid.hossain@gmail.com +86 186-2814-6971

ZONAID H._

AVAILABLE FOR WORK

Software Engineer (Backend) specializing in cloud-native applications, API design, and GenAI systems. Expert in building resilient microservices (Java, Go) and scalable data pipelines on AWS/GCP; delivered systems processing 1M+ events/day and real-time engines at 10k+ events/sec.

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SELECTED WORKS

Task Queue

Match Engine

Ledger

Task Queue

Match Engine

Ledger

2025

Projects

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Distributed Task Queue

Distributed Systems High Throughput

1M+ tasks/day

Challenge

Scaling a task queue to reliably handle bursts and sustained loads of 1M+ tasks/day while avoiding head-of-line blocking and maintaining steady worker utilization.

Solution

Introduced partitioned queues, adaptive rate limiting, and prioritized batching; used a hybrid in-memory/Redis-backed index to reduce scheduling overhead and achieve 35% throughput improvement.

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Ride-Hailing Matching Engine

Real-Time Geospatial

10k+ events/sec

Challenge

Scaling geospatial matching to support 10k+ concurrent events/sec with strict tail-latency SLAs under noisy location updates.

Solution

Optimized geospatial indices, sharded matching by region, and introduced a two-tier cache (Redis + local LRU) to cut lookup times and improve match quality by 60%.

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Compliance Ledger

Fintech Security Audit

100% traceability

Challenge

Ensuring tamper-evident audit trails across microservices with minimal performance impact and simplified reconciliation.

Solution

Implemented append-only ledger segments with Merkle proof sampling and incremental checkpoints; replication and compaction kept storage overhead predictable while enabling fast proofs.

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Drone Swarm System

IoT Real-Time

28% higher success

Challenge

Coordinating low-latency state and commands across dozens of devices in intermittently connected networks.

Solution

Designed an optimistic state-sync protocol with conflict resolution and local fallback behaviors; added heartbeat-driven health-checks to maintain a 28% higher mission success in adverse conditions.

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The Process

Discover the Essence
that drives your brand

I begin by clarifying your goals, audience, and market fit. The insights set a clear direction and define what success means for you.

Design Bold Ideas
with clear intention

I translate strategy into visual identity and page structure. Every element serves a purpose—clean, accessible, and ready for growth.

Deliver with Speed
and lasting impact

I architect and deploy cloud-native systems on AWS/GCP. You stay in control with modular infrastructure, automated CI/CD, and room to scale.

ABOUT ME

I’m a software engineer crafting robust, scalable, and innovative digital solutions that empower businesses to achieve their goals through technology.

Work Experience
Senior Engineer — Distributed Task Queue

2025

Built a task ingestion and routing pipeline that processed 1M+ tasks/day, delivering 35% higher throughput and a 140ms median latency reduction by optimizing batching and backpressure handling.
Lead Engineer — Ride-Hailing Matching Engine

2024 - 2025

Designed a matching pipeline for real-time dispatch at 10k+ events/sec, achieving 60% faster matching and reducing tail latency by 120ms through spatial indexing and prioritized queues.
Architect — Compliance Ledger

2022 - 2024

Implemented an immutable ledger with verifiable audit trails that reduced manual reconciliation time by 70% and supported 100% traceability across data pipelines.
Systems Engineer — Drone Swarm System

2021 - 2022

Built a resilient control plane for multi-agent coordination, increasing mission completion rate by 28% under lossy network conditions using adaptive consensus and state synchronization.

TECH STACK

Core

Fundamental languages I use for backend and systems engineering.

Java Go Python C++

Infrastructure

Cloud-native tooling and infrastructure-as-code expertise.

Kubernetes Docker Terraform AWS GCP

Data & Messaging

Reliable streaming and persistence systems I architect and operate.

Kafka Redis PostgreSQL MongoDB

TECHNICAL RECOMMENDATIONS

“Zonaid consistently demonstrated exceptional problem-solving skills in designing and implementing high‑performance distributed systems. His work on the task‑queue optimization resulted in measurable performance improvements that directly impacted our service reliability.”

Senior Engineering Manager

Sun Caper Data

“Outstanding technical leadership on the compliance ledger project. Zonaid’s deep understanding of distributed systems and attention to architectural details ensured we built a robust, scalable solution that met our strict audit requirements.”

Principal Architect

MaesInfo

PUBLICATIONS & TALKS

Designing Resilient Task Pipelines — Conference Workshop (2025)

Workshop slides & sample code (placeholder)

Scaling Geospatial Matching at 10k+ EPS — Tech Blog (2024)

Case study and performance breakdown (placeholder)

Talks & Slides

Add slide decks, YouTube recordings, or conference links here for each talk.

TECHNICAL BLOG

Scalable Matching Engines — TL;DR

A concise breakdown of sharded indices and caching for sub-200ms matches.

Distributed Task Queue — Design Notes

Architecture overview of a 1M+ tasks/day job processing system.

Compliance Ledger — Implementation Summary

Design patterns for immutable, replayable financial ledgers.

Engagement Models

Consultation

Hourly / Audit

Expert guidance on architecture, code audits, and system design tailored for your team.

BOOK A SESSION

Focus Areas:
// System Architecture Review
// Code Quality & Security Audit
// Performance Bottleneck Analysis
// GenAI Strategy Consultation

Project Implementation

Fixed / Milestone

End-to-end delivery of complex backend systems, MVPs, or high-performance modules.

DISCUSS YOUR PROJECT

Deliverables:
// Cloud-Native Microservices
// High-Scale Data Pipelines
// Custom API Development
// Production-Ready Deployment

Fractional Lead

Monthly Retainer

Ongoing technical leadership to guide your team, stabilize systems, and drive roadmap.

INQUIRE AVAILABILITY

Services:
// Technical Roadmap Strategy
// Team Mentorship & Hiring
// DevOps & SRE Best Practices
// Infrastructure Cost Optimization

OPEN TO WORK

Open to Senior Backend & Cloud-Native Roles

Actively seeking roles and contracts that focus on distributed systems, platform reliability, and GenAI integrations. Available for remote or relocation.

Contact & Interviews Download CV

Frequently
asked questions

How long does a project usually take?

Most projects are completed within 4–8 weeks, depending on complexity, revisions, and scope. I’ll always provide a clear timeline before starting.

Do you work with international clients?

Yes, I collaborate with clients worldwide using online meetings, project management tools, and shared design platforms to ensure smooth communication.

Can you help with both design and development?

Absolutely. I handle branding, UI/UX design, and no-code or coded development to deliver a complete end-to-end solution.

What’s your payment process?

I typically require a 50% deposit to begin work, with the remaining balance due upon project completion and approval.

Do you provide ongoing support after launch?

Yes. I offer maintenance, updates, and performance monitoring packages to keep your website or product running smoothly long-term.

Let’s start
creating together

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Web Development
UI/UX Design
Digital Marketing

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$500 – $1,000

Project details

say hello - zonaid.hossain@gmail.com

Projects

Distributed Task Queue

Challenge

Solution

Ride-Hailing Matching Engine

Challenge

Solution

Compliance Ledger

Challenge

Solution

Drone Swarm System

Challenge

Solution

The Process

Discover the Essence that drives your brand

Design Bold Ideas with clear intention

Deliver with Speed and lasting impact

ABOUT ME

I’m a software engineer crafting robust, scalable, and innovative digital solutions that empower businesses to achieve their goals through technology.

TECH STACK

Core

Infrastructure

Data & Messaging

TECHNICAL RECOMMENDATIONS

PUBLICATIONS & TALKS

Talks & Slides

TECHNICAL BLOG

Engagement Models

Hourly / Audit

Fixed / Milestone

Monthly Retainer

OPEN TO WORK

Open to Senior Backend & Cloud-Native Roles

Frequently asked questions

Let’s start creating together

Discover the Essence
that drives your brand

Design Bold Ideas
with clear intention

Deliver with Speed
and lasting impact

Frequently
asked questions

Let’s start
creating together