Harare, Zimbabwe

Full-stack application engineering, relational data pipelines & route optimization.

I am a Software Engineer and Computer Science graduate. I build production-grade web and mobile systems utilizing Next.js, Flutter, and Laravel, with a deep focus on database normalization, offline synchronization, and graph heuristics.

View Architecture & Projects GitHub Profile

Application Layer

Next.js 14, Flutter, React

Storage & Backend

PostgreSQL, Laravel, Supabase

Applied CS

Dijkstra & Held-Karp Routing

system_monitor.sh

TELEMETRY CONVERGED

ENGINEER Simon Mkaro

PRIMARY_STACK Next.js 14 / Flutter

DATABASE_CORE PostgreSQL / Supabase

CORE_HEURISTIC Held-Karp Dynamic Path

GRAPH EVALUATION LATENCY 14.8 ms

Vertex Pool: 7 Nodes Memory Footprint: 28MB

Subsystem 07 / Online Inspect Projects

01 // Selected Work

Production Applications & Systems

Graph Optimization Held-Karp & Dijkstra

Interactive Engine

Algorithmic Route Optimizer & Topology HUD

High-throughput pathfinding and routing simulation engine designed for multi-vertex transit nodes. Evaluates priority-queue Dijkstra sub-paths and dynamic programming permutations in <15ms. Click any two transit vertices on the canvas to benchmark latency and compute the optimal path in real time.

HTML5 Canvas TypeScript Dijkstra Min-Heap Held-Karp DP

topology_canvas.ts

Complexity: O(V + E log V) • 6 Vertices

Tip: Click any node to set new origin/destination

SELECTED ROUTE HRE → GWE → BYO → VFA

TOTAL WEIGHT 876 km

EVAL LATENCY 13.4 ms

HEURISTIC STATUS OPTIMAL PATH

Repository

Database Systems PostgreSQL • Supabase

Multi-Tenant Data Management Platform

Scalable administrative backend featuring automated database migrations, strict PostgreSQL Row-Level Security (RLS) policies, and high-throughput transactional logging across Supabase and Laravel.

PostgreSQL 16 Supabase RLS Laravel 11 REST B-Tree Indexing

rls_policy_inspector.sql

ISOLATION SECURED

ACTIVE TENANT:

// Policy: tenant_isolation_policy

SELECT id, invoice_id, balance

FROM billing_records

WHERE tenant_id = 'org_1042';

RECORDS RETURNED 3 (Zero Leakage)

QUERY EXEC TIME 1.42 ms (Indexed)

Zero-Downtime Schemas Inspect Schema & Migrations

Mobile Architecture Flutter • SQLite • Firestore

Offline-First Mobile Logistics Client

Field operational utility engineered with local SQLite persistence and bidirectional Cloud Firestore synchronization. Guarantees zero transaction loss during transit corridor network blackouts using Write-Ahead Logging (WAL) and deterministic timestamp conflict resolution.

Flutter & Dart SQLite WAL Firestore Sync Deterministic LWW

sync_engine_state_machine.dart

CARRIER CONNECTED

NETWORK SIMULATOR:

// Local SQLite WAL Buffer 0 Transactions Pending

Dispatch Status: Synced to Firestore Cloud

Active Protocol: Bidirectional Exponential Backoff + UUID v4 Keys

LOCAL WRITE LATENCY 0.82 ms (SQLite Disk)

PACKET LOSS RATE 0.00% (Guaranteed)

Synced: Real-Time

Offline Persistence Layer Source Repository

Speech Processing Python 3.11 • Redis • FastAPI

Distributed Audio Ingestion & Worker Queue

High-throughput speech segmentation and transcription ingestion pipeline. Employs asynchronous Redis Stream consumer groups and non-blocking chunk generators to process long-format audio files without memory spikes.

Python 3.11 FastAPI Workers Redis Streams FFmpeg Slicing

audio_ingest_pipeline.py

WORKERS ACTIVE

BUFFER STREAM: audio_stream_batch_04.wav 120s • 16kHz Mono

Chunk 01 [Done] Chunk 02 [Done] Chunk 03 [Processing] Chunk 04 [Queued]

MEMORY CEILING 41.8 MB (Stream Bounded)

INFERENCE LATENCY 184 ms / chunk

Job: #ACK-7729

Asynchronous Background Dispatch Source Repository

02 // Technical Disciplines

Engineering Stack & Architectural Pillars

Core frameworks, storage solutions, and algorithms implemented across production systems.

Client & Mobile

Responsive web apps, modular interfaces, and cross-platform native mobile performance.

Next.js 14 / React SSR

Flutter / Dart Mobile

Tailwind CSS Tokens

TypeScript Strict

Backend & APIs

RESTful contracts, authentication barriers, queue processors, and enterprise services.

Node.js / Express APIs

Laravel (PHP) Enterprise

Python / FastAPI Workers

REST & Webhooks Pipelines

Data & Cloud

Relational schemas, row-level access control, data migration scripts, and NoSQL stores.

PostgreSQL Indexing

Supabase Auth & DB

Firebase Firestore Realtime

Git & Linux CI / CD

Applied Algorithms

Graph search heuristics, dynamic programming, priority queues, and space-time evaluation.

Dijkstra / Heuristics Latency

Held-Karp (TSP) DP Matrix

Min-Priority Queues Heaps

Speech NLP Audio

03 // Creative Studio

@Mkarodesignedit

Design tokens, UI architecture, computational typography, and street/architectural framing.

Instagram TikTok

SYSTEM_SPEC_2026

SPACING: 4px / 8px / 16px / 24px

UI Architecture

Design System Tokens & Micro-HUDs

Structured color scales, typography rules, and spacing tokens used in technical dashboard interfaces.

View Breakdown

GEOMETRY_RAW_01

Street & Architecture

Urban Geometries & Shadows

Exploring high-contrast structural symmetry, diagonal perspective lines, and negative space through 35mm framing.

View Frame

O(V + E log V)

HELD_KARP SUBSET DP

ASYMPTOTIC VISUAL SYSTEM

Graphic Systems

Computational Typography

Visual print studies combining computational complexity notation with geometric layout frameworks.

Inspect Artifact

04 // Background & Principles

Rigorous Systems & Measurable Architecture

I am a Computer Science graduate and Full-Stack Software Engineer based in Harare, Zimbabwe. My work concentrates on architecting reliable distributed applications, balancing normalized PostgreSQL schemas and real-time synchronization with low-latency client interfaces.

I prioritize clarity over visual novelty: strict 8-point layout spacing, standardized component boundaries, reliable error states, and predictable data ingestion pipelines. In every build, engineering decisions are driven by maintainability, testability, and real-world system utility.

Through @Mkarodesignedit, I document software architecture breakdowns, design system tokens, and photographic studies of architectural geometry.