Faridul Reza Sagor — personnel dossier — SUBJECT · ACTIVE · SEC-LVL 4

personnel file · subject identified

Engineer first. Problem-finder second. Technology-picker last.

I'm a full-stack engineer from Sylhet, Bangladesh. My favourite kind of project starts with a problem nobody's solved cleanly, and ends with a tool someone else actually depends on. Three years in, the stack has changed a few times — the appetite hasn't. Captain Mercer says the Krill stop being scary once you talk to them. Same logic with codebases.

Programming is the hobby. Shipping is the job. The rest is a really long away mission.

dossier

DesignationFaridul Reza Sagor

RankBackend & AI Engineer

VesselAskTuring.ai

PostingSylhet Sector · BD

BornMar 19, 2001 · Stardate 2001.78

LanguagesEnglish · Bengali

StatusOpen to commission

service record · stardates 2020 → present

Tours of duty.

Personnel dossier (PDF)

Jul 2025 →
present

AskTuring.ai remote

Backend & AI Engineer

Maintained stability + introduced features in the LangGraph pipeline.
Optimized the RAG pipeline — ~28% latency reduction, ~15% accuracy gain across benchmarks.
Led core LLM-pipeline optimization: async task execution, parallel processing, step consolidation, eliminating redundant operations.
Led documenting the full system architecture in Mermaid.
Led end-to-end SaaS perf optimization to support 1,500+ concurrent users — DB session bottlenecks, system limits, query tuning, stress testing.
Leading a small engineering team while staying hands-on in code.
Designed a complex paywall with custom Stripe subscription logic — multiple pricing & access scenarios.
Owned the file-management & user-management frontend modules (incl. Google Drive / OneDrive / Dropbox imports).
Optimized large-dataset file-management UI using Web Workers + React Query.
Set up custom ESLint rules & standards for long-term maintainability.
Integrated PostHog + Intercom; built event-driven messaging pipelines with PostHog + Loops + custom Python schedulers.

Apr 2024 →
Jun 2025

Learnyx AI New York · remote

Software Engineer

Built Unity-based dynamically-generated games driven by AI-generated stories.
Designed the character-assembly system so characters could interact in-game.
Built a comic-book-style storytelling layer that shared characters with the game.
Achieved seamless Unity ↔ ReactJS integration — both sides could call each other.
Developed NestJS backend; handled API integration.
Managed FastAPI backend with LangChain for AI tasks.
Designed and implemented the LitZone backend — fantasy baseball for kids.
Worked with websockets for realtime drafting in LitZone.
Built critical frontend integrations for LitZone.
Managed deployments via Coolify, troubleshooting EC2 + Cloudflare issues.
Integrated RevenueCat payments in a Capacitor iOS app; managed App Store deploys.

Jan 2020 →
Apr 2024

Freelance global

Full-stack developer · Fiverr Level 2 seller

Custom, high-performance software for clients across front-end and back-end stacks.
Built many Chrome extensions with backend support and admin panels.
Designed diverse automation systems for client workflows.
Requirements gathering → analysis → shipped solution; lots of repeat business.
Juggled multiple projects with tight deadlines without dropping quality.
Used the right tool each time — picked up new frameworks per project requirements.

tactical loadout

Equipment & sidearms.

Standard-issue tools, not a wishlist. Sorted by current depth.

backend & ai

NestJS core

Python · FastAPI core

LangChain · LangGraph core

PostgreSQL core

MongoDB core

Firebase solid

Web Workers solid

WebSockets solid

frontend

React · Next.js core

React Query core

Chrome Extensions core

DOM manipulation core

Unity WebGL ↔ React unusual

Capacitor (iOS) solid

infra & ops

AWS · EC2 solid

GCP solid

Cloudflare solid

Coolify solid

Docker · CI/CD core

Play Console · App Store solid

integrations & tooling

Stripe · RevenueCat core

PostHog core

Intercom · Loops solid

Pinterest · Facebook API solid

WordPress REST solid

SSLCommerz solid

DeepGram · OpenAI solid

Mermaid · Architecture docs solid

languages

JavaScript · TypeScript core

Python core

C / C++ CP-fluent

Java solid

C# Unity

commendations & citations

Some things that meant a lot.

🏆 CHAMPION · NOV 2023

DU ITVERSE 2023 — Open API segment

Built a web app to present real-time air quality and socio-economic data on an interactive map. Compare any two cities, search, play with the map.

Watch the demo ↗

🥉 SECOND RUNNER-UP · JAN 2023

SUST SWE Technovent 2023

Browser extension that analyzes Google Meet video feeds to detect inattentive attendees, built to help teachers monitor online classes and generate engagement reports.

📈 SINCE 2019

1,200+ online-judge problems solved

Sunday mornings with LightOJ and Codeforces. Mostly graph algorithms, sometimes regret.

codeforces ↗ · lightoj ↗

⭐ FIVERR LEVEL TWO

3 years of clients across the world

Repeat clients, weird timezones, harder problems each time. The school I didn't know I was enrolled in.

fiverr profile ↗

academy

B.Sc. CSE — Shahjalal University of Science and Technology

Commissioned October 2024 · GPA 3.72 / 4.00

Off-duty

Problem solving · Compilers & parsers · 3D Chess · CoD

Languages

English (C1) · Bengali (native) · enough Klingon to be polite

captain's log · drafting

A logbook is brewing.

Long-form notes on RAG performance, Unity-React bridges, and the weirder corners of full-stack work. Subscribe to the empty feed and feel ahead of the curve.

DRAFT · COMING SOON

Cutting RAG latency without losing accuracy

DRAFT · COMING SOON

Notes on bridging Unity WebGL and React

DRAFT · COMING SOON

A pragmatic intro to LangGraph for tired engineers