Software Engineer @ Adfinix · Dhaka, Bangladesh

Mehraz Hossain
Rumman

I build the backends behind real-time ad-tech: bidding, click and impression pipelines, and analytics on Django and ClickHouse. Google Summer of Code 2025 contributor with IOOS. Patches merged in Django, DRF, Scrapy, Celery and Kombu. On the side I analyse Bangladesh's public data, from road accidents to dengue.

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Mehraz Hossain Rumman

Software Engineer · Adfinix

Dhaka, Bangladesh · --:--

Focus: Backend · Ad-tech · Data
Experience: 4+ years
Open source: 7 projects incl. Django, DRF, Celery
Highlight: GSoC 2025 · Keynote, Hacking Limnology

59 repos
18 followers
— stars

github.com/MehrazRumman

Popular on GitHub

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Now

Software Engineer at Adfinix

Building Adsloft and Aifinix: DSP/SSP tracking, OpenRTB bidding flows, and real-time analytics for advertisers and publishers. Since July 2024.

Django
DRF
ClickHouse
MongoDB
OpenRTB
Next.js

4+years shipping

2backends from scratch

7OSS projects patched

’25GSoC · IOOS

About

Mathematics graduate turned backend engineer. I spent my degree in programming contests, which is where I learned to care about correctness under pressure. Now I build ad-tech systems by day and contribute to the Python ecosystem I depend on. Through GSoC I shipped HTTP caching to pyOBIS, then took the work on stage as a keynote speaker at Hacking Limnology 2025. I've taught Python online since 2022.

Education

B.Sc. Mathematics

Jagannath University, Dhaka
2019 – 2024 · GPA 3.59 / 4.00

Coordinates

23.8103° N
90.4125° E

UTC+6 · open to remote

Python
Django
Django REST Framework
ClickHouse
MongoDB
PostgreSQL
Go
Next.js
React
FastAPI
Docker
Jenkins
GitHub Actions
OpenRTB
scikit-learn
Pandas
xarray
Python
Django
Django REST Framework
ClickHouse
MongoDB
PostgreSQL
Go
Next.js
React
FastAPI
Docker
Jenkins
GitHub Actions
OpenRTB
scikit-learn
Pandas
xarray

01 — Experience

Where I've worked

Jul 2024 — PresentDhaka, Bangladesh
Software Engineer Adfinix
- Built the Adsloft backend from scratch: a SaaS that tracks DSP/SSP clicks, impressions and views and generates real-time data and detailed reports for advertisers and publishers.
- Built the Aifinix backend from scratch with Django and DRF, designing scalable APIs, authentication, analytics pipelines and business logic; contributed to its frontend too.
- Designed and delivered an analytical dashboard end to end: schema design, backend aggregation and frontend visualization for real-time insights.
- Upgraded the Adfinix product from Django 3.2 to 5.1 with its dependencies, fixing bugs and optimizing hot paths along the way.
- Implemented CPM and frequency capping, built rich media ads and resolved API issues across the platform.
- Worked with OpenRTB for real-time bidding and built a mock server to test DSP and SSP request-response interactions.
- Used MongoDB for high-volume event and analytics data, wrote a Slack bot for internal automation, and built the Adsloft marketing site in Next.js.
- Django
- DRF
- ClickHouse
- MongoDB
- Next.js
- OpenRTB
- Docker
- Jenkins
May 2025 — Jul 2025Remote
Google Summer of Code Contributor IOOS
- Implemented HTTP-level caching in the pyOBIS Python package using requests-cache, with cross-platform cache paths, unit tests and docs. Every PR merged upstream.
- Built a seagrass habitat analysis notebook combining OBIS and GBIF occurrences with environmental variables: One-Class SVM anomaly detection, temporal analysis and Species Distribution Model mapping.
- Keynote speaker and workshop instructor at Hacking Limnology 2025 on pyOBIS and marine ecological modeling.
- Python
- requests-cache
- Pandas
- scikit-learn
- xarray
- Jupyter
Final report pyOBIS
Nov 2022 — PresentRemote · Freelance
Online Python Trainer
- Teach Python from beginner to intermediate level, with a focus on debugging, reading errors and problem-solving.
- Introduce core data structures and algorithms; run weekly exams and coding challenges to track progress.
- Python
- DSA
- Mentoring
Apr 2022 — May 2024Dhaka · Remote
Trainee Software Developer TrendBreaker
- Built a desktop application with PyQt5, and a React Native mobile app backed by Django.
- Worked on data analysis projects to support business decisions.
- PyQt5
- React Native
- Django
- Data analysis

02 — Projects

Things I've built

main.go

req := &gortb.BidRequest{
    ID:  "bid-req-1",
    Imp: []gortb.Imp{{ID: "imp-1",
        Banner: &gortb.Banner{W: 300, H: 250}}},
}
if err := req.Validate(); err != nil {
    // ErrMissingID, ErrNoMediaPresent, ...
}
body, _ := json.Marshal(req)

Library · Go

GoRTB

A full OpenRTB 2.5 implementation in Go: type-safe bid request and response structs, recursive validation with sentinel errors and wire-format JSON. Standard library only.

Go
OpenRTB 2.5
Ad-tech

The built-in Observer Dashboard listing captured FastAPI request events

Middleware · Python

fastapi-observer

Zero-boilerplate structured logging for FastAPI with pluggable storage (memory, JSON, SQLite), filters and a built-in event dashboard. On PyPI as fastapi-inspector.

Python
FastAPI
PyPI

Web app · TypeScript

CV Generator

CV, Europass, biodata and academic CV builder in the browser: 42 templates, live PDF preview, ATS-readable text and correct Bangla shaping. Nothing leaves the browser.

Next.js
react-pdf
Zod

Work · Adfinix

Adsloft

SaaS tracking DSP/SSP clicks, impressions and views with real-time reporting. Backend built from scratch, ClickHouse for event analytics, marketing site in Next.js.

Django
ClickHouse
Next.js

Work · Adfinix

Aifinix

Ad-tech platform backend: scalable APIs, auth, analytics pipelines and an end-to-end analytical dashboard over high-volume MongoDB event data.

Django
DRF
MongoDB

Research · GSoC

Seagrass Habitat Analysis

Merges OBIS and GBIF occurrences with environmental layers: One-Class SVM anomaly detection, temporal trends and SDM maps. Taught at Hacking Limnology 2025.

scikit-learn
xarray
SDM

Full-stack

KachaMorich

E-commerce app with accounts, payments, profiles and order reviews for customers, plus user, product, role and order-status management for admins.

Django
React
PostgreSQL

Academic

DSP with Fast Fourier Transform

Digital signal processing study applying the FFT to analyse and filter signals, built during my mathematics degree.

Python
NumPy
Signal processing

Notebook · Colab

pyOBIS Workshop Notebook

Hands-on Species Distribution Modeling with OBIS data, as run for the Hacking Limnology 2025 workshop. Open it in Colab and run it end to end.

Python
pyOBIS
Jupyter

03 — Data analysis

Public data, cleaned and mapped

Open, reproducible studies of Bangladesh built from government reports and press data. Every row keeps a link to its source.

Interactive Bangla map of road deaths by division in Bangladesh, with accident-prone highway spots marked

Live map

Jupyter · Road safety2021 – 2026

Bangladesh Road Accidents

Road Safety Foundation and official BRTA monthly reports, transcribed from scanned PDFs, checked against each report's totals and analysed by year, vehicle, division and season. Ships with an interactive Bangla map of all 64 districts and 215 accident-prone highway spots.

7,359: road deaths in 2025
36%: of them on motorcycles
+26–51%: deaths per day during Eid travel

Chart of road deaths per year, 2021 to 2026

Heatmap of road deaths per day by month and year

pandas
matplotlib
seaborn
Leaflet
Jupyter

Interactive map Repository

Maps of dengue cases per 100,000 people by division in Bangladesh, 2025 compared with 2026

Notebook

Jupyter · Public health2000 – 2026

Dengue in Bangladesh

Where dengue strikes, how the hot zones shift and who dies. Joins DGHS surveillance, district case counts, census population and climate data into hotspot maps, case fatality rates, seasonality and temperature-lag correlations.

116,990: cases in 2026, second-worst year
3.8×: Barishal vs national rate, 2025
~2×: fatality rate for women vs men

Heatmaps of dengue incidence and relative risk by division, 2020 to 2026

Weekly dengue cases in 2026 compared with 2025

pandas
GeoPandas
NumPy
matplotlib
Jupyter

Read the analysis Repository

04 — App development

On the Play Store, and on the way

One app live on Google Play and two more in active development.

Live on Google Play

Strat Roulette

Spin the wheel and get an alternative strategy to shake up your next match. Supports CS2, Rainbow Six Siege, Fortnite, Overwatch and PUBG.

Android
Gaming
Published

In development

Becho

A business toolkit for merchants and small business owners: track sales, inventory and customers from a single app.

Android
Merchants
SMB

In development

Nirbhor

A medicine alarm app that reminds you and the people you care for to take the right dose at the right time.

Android
Health
Reminders

05 — Web scraping

Turning websites into datasets

Crawlers and extraction pipelines that ship clean, structured data from messy sites.

Client · 24baba.com3,700+ listings

Car listings & images

Scraped 3,700+ car listings with full specs and every photo, normalised into a clean dataset ready to import into the marketplace.

Python
Image pipeline
Deduplication

Combat sports7 sources

Fight results database

Event, bout and fighter results across five disciplines, unified into one schema from sites with very different layouts.

BoxingBoxRec
Muay ThaiMuay Thai Records
KickboxingGlory · RISE
Bare-knuckleBKFC
Jiu-jitsuIBJJF · UFC BJJ

Healthcaredataset

Medicines catalogue

Drug names, generics, manufacturers, dosage forms and prices collected from pharmacy and regulator sites into a searchable catalogue.

Python
Structured data
Pharma

06 — Open source

Patches in the tools I use daily

pyOBISfeature

HTTP caching layer, OS-specific cache paths, docs and tests. Delivered through GSoC 2025.

Django REST Framework3 PRs merged

Django 6.0 support, a fix for ListSerializer breaking on unique-constraint validators, and Django 4.2 support docs. The toolkit that powers most of my day job.

Kombu3 PRs merged

Redis transport fixes: a sentinel_fanout_compat option for mixed-version Sentinel clusters and replacing the deprecated ZREVRANGEBYSCORE with ZRANGE BYSCORE REV.

Scrapy3 PRs merged

Test fixes and cleanup in the web-crawling framework.

Djangopatches

Minor improvements and patches. Listed among first-time contributors in Django News.

Celerybug fixes

Bug fixes and enhancements to the distributed task queue.

DRF-extensions6 PRs merged

Test fixes, cleanup and version upgrades across the Django REST Framework extension set.

07 — Skills

What I reach for

Languages

Python
Go
SQL
C
C++
Fortran

Frameworks

Django
Django REST Framework
FastAPI
Next.js
React
React Native
PyQt5

Data stores

PostgreSQL
ClickHouse
MongoDB

Infrastructure

Docker
CI/CD
GitHub Actions
Jenkins
Git
Bitbucket
OpenRTB

ML & analysis

Pandas
NumPy
GeoPandas
scikit-learn
xarray
matplotlib
seaborn
folium
Leaflet
Jupyter
SVM / One-Class SVM
Random Forest
Regression
Species Distribution Modeling

Mathematics

Linear algebra
Calculus
Fuzzy mathematics
Data structures & algorithms

08 — Competitive programming

Contests & hackathons

Max-rated Specialist (1425) on Codeforces as Izuku__Midoriya (1,750+ problems solved) · 3★ on CodeChef (keai33, 138 problems) · problems on LeetCode and HackerRank.