Platform
Winter Marketplace
Property marketplace for buying and selling houses and land in Tanzania, with escrow protection for both parties.
DjangoNext.jsPostgreSQL
Escrow-protected property trades
Available for workMwanza, Tanzania
Josia Mosses
# Software Developer · Tech Artisan
profile.py
class JosiaMosses(Developer):
"""Self-driven full-stack developer building
localized digital infrastructure for the East
African market — fintech integrations, escrow
marketplaces, and intelligent automation — with
one foot already in machine learning."""
stack = ["Django", "DRF", "Next.js", "PostgreSQL"]
focus = "Machine Learning Engineering"
def build(self, problem):
return architecture_for(problem, region="East Africa")
- 10
- Public GitHub repositories3 currently live in production
- 2022
- Building software sinceFirst commit to today
- 1 + 1
- Professional role + founded studioRock City Mall · WinterNex
profile.jpg
>>> developer.portrait
# Josiah O. Mosses · WinterNex
About
The person behind the commits
Written the way I think about it — as a class with a docstring, a few honest properties, and a method that keeps running.
about.py
class About:
"""Who I am, in plain terms."""
role = "Full-Stack Developer"
aspiring = "Machine Learning Engineer"
region = "East Africa"
approach = "build what ought to exist, locally"
def summary(self):
"""Self-driven and results-oriented — my work sits at
the intersection of software and the physical world,
building localized digital infrastructure rather than
importing templates that don't quite fit.
"""
shipped = [
"end-to-end web apps", "fintech + escrow",
"intelligent automation", "mall ops tooling",
]
stack = ("Python", "Django", "Next.js")
return "an engineer's notebook, not a landing page"
# off_screen = [
Reading (mostly)Sci-fi & quiet art-house filmsGospel & country musicLinear algebra, slowlySwahili language modelsLong walks before long commits
]
# current_focus()
- 01.Advancing toward Machine Learning Engineering — ensemble methods, language models, and from-scratch training
- 02.Shipping WinterNex studio ventures: Soko, DomainHub TZ, Eneo, and KiswahiliLM
- 03.Deepening mathematical foundations: linear algebra, calculus, probability & statistics
- 04.Building localized digital infrastructure for the East African market
# reading_now
The Pragmatic Programmer
by Hunt & Thomas
Skills
The full technical stack
Think of it as INSTALLED_APPS — grouped by what each tool is actually for, not by what looks impressive on a list.
Languages
- PythonAdvanced
- JavaScriptProficient
- HTML5 / CSS3Proficient
- SQLProficient
- CWorking
- Bash scriptingWorking
Backend
- DjangoAdvanced
- Django REST FrameworkAdvanced
- FlaskProficient
- CeleryWorking
- RedisWorking
Frontend
- Next.js (App Router)Proficient
- ReactProficient
- TypeScriptProficient
- Tailwind CSSProficient
Databases & Storage
- PostgreSQLProficient
- SupabaseWorking
- SQLiteProficient
Machine Learning / AI
- Scikit-learnProficient
- TensorFlowWorking
- NumPyProficient
- PandasProficient
- MatplotlibWorking
DevOps & Deployment
- Git / GitHubAdvanced
- DockerWorking
- Google Cloud (GCP)Working
- RenderProficient
- RailwayProficient
Local Market Integrations
- Selcom Mobile MoneyProficient
- AzamPesaWorking
- Africa's Talking SMSProficient
- ResellerClub APIWorking
Working in East Africa
Most of my work integrates with local payment rails and communication APIs — Selcom, AzamPesa, Africa's Talking. It's the unglamorous layer that makes software actually usable here.
+ custom Python automation for physical-world ops
Projects
Things I've built
A complete, honest catalogue — like a migrations folder, each entry is a shipped change. From production marketplaces to a programming language I wrote for the fun of it.
Showing everything — flagship, studio, and side projects.
PlatformLive
Wasanidi
Hyperlocal developer network for Tanzania & East Africa — discover collaborators nearby, showcase work, follow peers, arrange coffee chats.
DjangoReactPostgreSQLREST APINext.js
Live in production
Web App
Hotel-Nex
Modern hotel management and food ordering platform built for Tanzania and beyond.
DjangoReact
PlatformLive
SmartDalali
Property listing platform for houses and land to rent or buy across Tanzania.
DjangoReactPostgreSQLREST APINext.js
Live in production
AI / ML
NeuroScan — Brain Tumor Detection
AI-powered brain tumor detection combining CNN, VGG16, AdaBoost, and CatBoost in a weighted ensemble for diagnostic accuracy. Trained in Colab, deployed with Flask.
PythonFlaskDeep Learning
Weighted ensemble of 4 models
AI / ML
ML Cancer Detection
Breast cancer tumor classifier (malignant / benign) from 30 clinical features — Jupyter training notebook paired with a Streamlit app.
PythonScikit-learnStreamlit
Web AppLive
LawBlog (ACDS Africa)
Bilingual (English / Swahili) publishing hub — legal updates, creative writing, and advocacy tracking.
FlaskPythonJinja2
Web App
VitaminCafe
Online restaurant management and food ordering system.
DjangoReactPostgreSQL
Web App
Voting System
Secure web-based voting system — registration, login, and casting votes for presidential / VP candidates.
FlaskPythonSQLite
Web App
Planning App
Personal productivity app — plan the day, track a budget, and reflect at day's end.
PythonFlaskSQLite
PlatformIn progress
Soko
Tanzania marketplace with escrow. Django/DRF + Next.js monorepo, Celery/Redis, Firebase, and Selcom integration.
DjangoDRFNext.jsCeleryRedisSelcom
In progress
PlatformIn progress
DomainHub TZ
Domain registration platform. Django + Next.js 14 wired to ResellerClub, Selcom, Africa's Talking, and Supabase.
DjangoNext.jsResellerClubSelcomSupabase
In progress
PlatformIn progress
Eneo
Mall management SaaS, built with Rock City Mall context in mind. Django/DRF + Next.js + React Native + Azampay.
DjangoDRFNext.jsReact NativeAzampay
In progress
PlatformConcept
Shule
Multi-school management SaaS designed for Tanzanian schools.
DjangoDRFNext.js
Concept
AI / MLIn progress
KiswahiliLM
A from-scratch GRU-based Swahili language model — no transformers, no wrappers. Designed to run on free Google Colab, trained on Kaggle/Mendeley Swahili corpus with a custom BPE tokenizer.
PythonPyTorchGRUBPE Tokenizer
In progress
Tooling
Wazi
A complete original programming language — a Python-implemented lexer, parser, and REPL, written from scratch.
PythonLexerParserREPL
A language of my own
AI / ML
Hand Gesture + CV Demo
OpenCV / MediaPipe project featuring a 3D air-drawing canvas and an ANN visualizer.
OpenCVMediaPipePython
Web App
WinterNex Studio Site
The studio's own marketing site with a blog and admin panel — built in Flask, deployed on Railway.
FlaskPythonRailway
Experience & Education
A short, accurate timeline
No invented metrics, no placeholder history — the changelog of verified roles and the one credential, in order.
Active
IT Specialist — Parking Systems, Smart Gates & CCTV
Jul 2025 — PresentRock City Mall
Mwanza, Tanzania
Operate, monitor, and troubleshoot automated smart parking infrastructure, automated gates, ticket dispensers, and RFID access systems. Maintain network-connected CCTV camera arrays, NVR tools, and access-control surveillance. Diagnose network and hardware faults to minimize downtime, and build custom Python automation scripts for back-office workloads — file manipulation, scraping, and data verification.
Smart parkingRFIDCCTV / NVRPython automationNetwork diagnostics
Active
Founder — WinterNex
OngoingWinterNex Company Limited
Mwanza, Tanzania
Solo software studio building platforms for the East African market — marketplaces, domain registration, school management, and AI tools — on a Django REST Framework + Next.js stack, deployed across GCP, Render, and Railway. Registered via BRELA as WinterNex Company Limited.
Django / DRFNext.jsGCPRenderRailwayBRELA-registered
Ordinary Diploma in Information Technology
2022 — 2025Institute of Accountancy Arusha (IAA)
Arusha, Tanzania
Core focuses: Information Systems, Database Systems, Network Management, and Applied Mathematics.
Information SystemsDatabase SystemsNetwork ManagementApplied Mathematics
Independent Specializations (self-directed, ongoing)
OngoingSelf-directed
Ongoing
Advanced Machine Learning & Data Science (Scikit-learn, TensorFlow), Software Engineering, and Mathematical Engineering — linear algebra, calculus, probability & statistics.
Machine LearningData ScienceSoftware EngineeringMathematical Engineering
“The only verified job is the Rock City Mall role; the only verified credential is the IAA Diploma. Everything else is the work I chose to do on my own time.”
Contact
Let's build something useful
Think of this as a POST request with no middleware — the form opens your mail app, pre-fills everything, and points it at info@winternex.co.tz. No backend, no tracking, just a direct line.
Location
Mwanza, Tanzania
Availability
Open to full-stack work, ML collaborations, and infrastructure automation projects — particularly anything serving the East African market.