TAJUL ISLAM// 18 • DHAKA |R&D & SYSTEMS
DHAKA // 23.8103° N, 90.4125° E
Tajul Islam
MD Tajul Islam
Software Engineer • Obig Digital R&D • Hermes Studio
DIGITAL WORKSPACE // TAJUL.DEV•EST. 2024
LATENCY: <18ms (EDGE CDN)11 PLATFORMS ACTIVE
SELECTION: [BUILDER_CORE // 1024×280]

TAJUL ISLAM

SOFTWARE ARCHITECTR&D & SYSTEMSAI-ASSISTED ENGINEERING18 YEARS OLD • DHAKA, BANGLADESH

I architect, research, and ship live software systems. Operating from a private digital studio in Dhaka, I engineer deterministic multi-jurisdiction calculation engines, multi-tenant commerce backends, autonomous content pipelines, and air-gapped client-side privacy enclaves.

PayDecode51 States Engine
SupportDecode510 Test Cases
FontsWiki11k+ Ingested
Commerce CoreMulti-Tenant 11
SimilarLogoClient Enclave
Hermes StudioDhaka Base
Tajul Islam in studio
Tajul Islam // 18, Dhaka
OBIG DIGITAL R&D • HERMES STUDIO
ENGINEERING MEMO // NOTEBOOK #03

"Most complexity in modern software is ceremony. I engineer deterministic systems from first principles: verified state machines, strict data integrity, and zero-bloat edge runtimes. 11 production platforms shipped."

// Tajul, Systems Architect✓ 11 Platforms
EXPLORE THE 11 PRODUCTION SYSTEMS
11 PRODUCTION PLATFORMS ACTIVE✦
51 US STATUTORY JURISDICTIONS CODIFIED✦
510 BENCHMARK COURT TEST CASES✦
100% IN-BROWSER ZERO-LEAK ENCLAVES✦
PESSIMISTIC CONCURRENCY ROW LOCKS✦
11,000+ TYPEFACES INGESTED UNATTENDED✦
2+ YEARS ZERO-MAINTENANCE STATIC UPTIME✦
49 CLIENT-SIDE DOCUMENT COMPILERS✦
SUB-20ms CLOUDFLARE EDGE LATENCY✦
11 PRODUCTION PLATFORMS ACTIVE✦
51 US STATUTORY JURISDICTIONS CODIFIED✦
510 BENCHMARK COURT TEST CASES✦
100% IN-BROWSER ZERO-LEAK ENCLAVES✦
PESSIMISTIC CONCURRENCY ROW LOCKS✦
11,000+ TYPEFACES INGESTED UNATTENDED✦
2+ YEARS ZERO-MAINTENANCE STATIC UPTIME✦
49 CLIENT-SIDE DOCUMENT COMPILERS✦
SUB-20ms CLOUDFLARE EDGE LATENCY✦
REGISTRY // 11 LIVE SYSTEMS

SELECTED PROJECTS

Every entry below is a verified, live production system currently in active operation. No mockups or speculative conceptual work.
paydecode.comFintech Calculation Engine
PayDecode live system screenshot
51jurisdictions modelled

PayDecode

paydecode.com

United States paycheck and wage calculation engine across 51 jurisdictions.

United States paycheck and wage calculators covering all 50 states plus DC, with every tax rate, progressive bracket, and local deduction traced to official statutory sources.

DATA PIPELINE FLOW:
Gross Wage Input → FICA & Medicare Caps → State Tax Schedules → Local Withholding → Net Pay Result
TypeScriptDeterministic MathCloudflare WorkersProgressive BracketsEdge Architecture
supportdecode.comLegal Calculation Engine
SupportDecode live system screenshot
510official examples verified against

SupportDecode

supportdecode.com

Child support, alimony, and wage garnishment formulas verified against 510 official state test cases.

Child support, alimony, and garnishment calculators running the authentic statutory formulas of 51 US jurisdictions, verified against 510 official state worked examples.

DATA PIPELINE FLOW:
Income Determination → Custody Allocation → Statutory Formula → Mandatory Deductions → Support Obligation
TypeScriptAutomated Test SuitesFamily Law Statutory ModelsZero-Tracking Privacy
fontswiki.comAutomated Content Platform
FontsWiki live system screenshot
11,000+records kept current, unattended

FontsWiki

fontswiki.com

Self-maintaining typography platform indexing 11,000+ typefaces unattended.

A typography encyclopedia that maintains itself. The content pipeline ingests, parses, extracts metadata, pairs fonts, and publishes without a human editor in the loop.

DATA PIPELINE FLOW:
Binary Ingestion → OpenType AST Parse → License & Glyph Audit → Semantic Pairing → Automated Publish
OpenType Binary ParsingData PipelinesProgrammatic SEOAutonomous CronMySQL Indexing
ecom1.hermesstudio.xyzMulti-Tenant Architecture
Three Commerce Storefronts live system screenshot
3storefronts, one codebase

Three Commerce Storefronts

Store 1

Three live e-commerce storefronts running on one hardened Laravel multi-tenant core.

Storefronts engineered for defensive real-world order behavior: duplicate-charge prevention, atomic stock decrements, abandoned checkout recovery, and webhook replay protection, all served from one shared codebase.

DATA PIPELINE FLOW:
Tenant Resolution → Pessimistic Stock Lock → Payment Gateway → Idempotent Webhook → Order Settlement
Laravel 11PHP 8Pessimistic LockingIdempotent WebhooksMulti-TenancyMySQL
dafontonline.comClient-Side Render Engine
Dafont Online live system screenshot
50+browsable categories

Dafont Online

dafontonline.com

Real-time font preview generator and discovery engine across 50+ categories.

Typography discovery platform featuring an instantaneous live text-preview generator that renders user-supplied text dynamically across fifty-plus font categories.

DATA PIPELINE FLOW:
User Text Input → Dynamic Glyph Load → Client Canvas Render → Category Filter → Instant Specimen
FontFace APICanvas 2D RenderingGlyph SubsettingWOFF2 Optimization
fontspark.comBinary Delivery Platform
Fonts Park live system screenshot
10,000+typefaces served

Fonts Park

fontspark.com

Curated library of 10,000+ typefaces with automated malware scanning and instant downloads.

A free font library with instant downloads, commercial-use license filtering, and automated safe-binary verification pipelines.

DATA PIPELINE FLOW:
Archive Ingest → Malware & Safe Scan → Zip Bomb Verification → License Filter → Direct Edge Delivery
Binary VerificationAutomated PackagingEdge CDNClean Distribution
freefontsvault.comDurable Static Platform
Free Fonts Vault live system screenshot
2 yrslive without a rebuild

Free Fonts Vault

freefontsvault.com

Static font platform running 2+ years continuously in production without a single rebuild.

My oldest build, still live, fast, and serving downloads two years on. Living proof that disciplined static architecture outlasts framework churn.

DATA PIPELINE FLOW:
Static Pre-build → Immutable Asset Hash → Global Edge Cache → Zero Maintenance → Multi-Year Uptime
Static ArchitectureDurability EngineeringZero-Maintenance OpsEdge Caching
simplebuthow.comAgronomic Decision System
Simple But How live system screenshot
40+verified rootstock matrices

Simple But How

simplebuthow.com

Agricultural decision engine for fruit growers backed by cited agronomic research.

Decision tools for fruit growers: graft compatibility, rootstock selection, and orchard spacing planning, with every recommendation backed by cited academic horticultural research.

DATA PIPELINE FLOW:
Climate/Soil Input → Scion Determination → Agronomic Rule Check → Compatibility Matrix → Cited Recommendation
Decision TreesAgronomic Data ModelingAcademic Source AttributionStatic-Compiled Logic
formnivo.comDocument Generation Engine
FormNivo live system screenshot
49structured document generators

FormNivo

formnivo.com

Forty-nine structured document generators assembling clean contracts, letters, and agreements.

Forty-nine document generators in one place, from non-disclosure agreements to operational letters, each producing a clean, formatted, ready-to-use file directly in the browser.

DATA PIPELINE FLOW:
Form Parameter Input → Clause Interpolation → Dynamic DOM Assembly → PDF/Print Engine → Immediate Download
Document CompilationPDF Layout GenerationClause InterpolationClient-Side Privacy
hermesstudio.xyzSoftware Engineering Studio
Hermes Studio live system screenshot
11platforms live in production

Hermes Studio

hermesstudio.xyz

Independent software studio in Dhaka designing, building, and maintaining live client systems.

My software studio in Dhaka, co-run with my elder brother. Scoping, architecting, shipping, and staying personally responsible for client platforms long after launch day.

DATA PIPELINE FLOW:
Plain-Language Scoping → Architecture & Price → Direct Development → Production Launch → Long-Term Accountability
Full-Stack EngineeringDirect ScopingProduction OpsDual-Pass Review
EXPERIENCE & BACKGROUND // DHAKA & REMOTE

STUDIO & INDUSTRY TRACK RECORD

Broad impact across engineering, R&D, and systems thinking. I contribute wherever software architecture, technical investigation, and product clarity unlock business leverage.

RECORD: VERIFIED

Obig Digital

~1.5-2 YEARS // LATE 2024 ONWARD
Software Engineering, AI-Assisted Development, Technical R&D & Business Investigation

At Obig Digital, I did not operate inside a narrow silo. Rather than treating engineering as simply receiving tickets, I worked across research, AI-assisted development, full-stack systems, technical investigation, and business strategy wherever I could create maximum tangible impact.

✓AI-Assisted Software Engineering: Leveraging cutting-edge frontier models and automated tool harnesses to accelerate development cycles and system prototyping.
✓Technical R&D & Prototyping: Investigating feasibility of new software architectures, data pipelines, and emerging engineering patterns.
✓Business Development & Systems: Bridging the gap between software design and commercial viability, aligning technical architecture with actual market bottlenecks.
✓Technical Writing & Content: Documenting complex architectures into crisp, plain-language engineering specifications that clients and stakeholders can understand.
Tajul Islam portrait
Tajul Islam // Builder & Researcher
DHAKA, BANGLADESH • AGE 18
Years Experience:~1.5-2 yrs (Late 2024+)
Primary Entity:Obig Digital / Hermes
Live Platforms:11 Production Systems
R&D NOTEBOOK // ARCHITECTURAL FORMALISMS & SYSTEMS RESEARCH

FIELD NOTES & RESEARCH

Rigorous post-mortems and architectural analyses from real production deployments. Formal proofs of numerical stability, acyclic concurrency lock graphs, zero-copy binary streaming, and air-gapped cryptographic execution.

STUDIO DISPATCH // DIRECT OPERATIONAL DIALOGUE

QUICK ANSWERS

Direct, unvarnished answers regarding systems capabilities, track record, Obig Digital tenure, and engineering philosophy.

Tajul Islam
MD Tajul IslamACTIVE
Dhaka Studio R&D • Dhaka, Bangladesh
Avg Response: <2 hours
Have an architecture or contract question not listed here?
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STUDIO DESK // DIRECT TRANSMISSION

GOT A SYSTEM IN MIND?

Whether it's a multi-jurisdiction calculation engine, a high-concurrency transactional backend, or a client-side privacy enclave. Let's talk architecture.

me@tajul.dev
TAJUL.DEV // 11 PRODUCTION PLATFORMS IN ACTIVE OPERATION
ARCHITECTED & BUILT BY TAJUL ISLAM • DHAKA, BANGLADESH • © 2026