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> tap anywhere for sound

// SYSTEM READY

DANIEL MAINA

Backend Software Engineer. Java. Spring Boot. Fintech & Enterprise.

VIEW WORK→
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01 // ABOUT

WHO IS RUNNING THE BACKEND?

whoami.sh

02 // SELECTED WORK

DEPLOYED SYSTEMS

PROJECT_01<repo/>

USER MANAGEMENT API

Multi-tenant authentication system with PostgreSQL RLS, JWT, and OpenTelemetry observability. 92% test coverage.

JavaJavaSpring BootSpring BootPostgreSQLPostgreSQLJWTJWTOpenTelemetryOpenTelemetry
VIEW PROJECT→

> Status: DEPLOYED

PROJECT_02<repo/>

CATALOG API

Enterprise product & inventory platform: multi-warehouse stock, optimistic locking, Redis caching, S3 media, Flyway migrations.

JavaJavaSpring BootSpring BootPostgreSQLPostgreSQLRedisRedisAWS S3AWS S3FlywayFlyway
VIEW PROJECT→

> Status: DEPLOYED

PROJECT_03<repo/>

GPS TRACKING SYSTEM

Real-time location tracking with geofence breach detection via Telegram bot alerts. Deployed on Railway.

PythonPythonFastAPIFastAPIPostgreSQLPostgreSQLRailwayRailwayTelegram BotTelegram Bot
VIEW PROJECT→

> Status: DEPLOYED

03 // CAPABILITIES

THE TOOLKIT

skills.sh
_
Java (Primary)Java (Primary)PythonPythonSQLSQLBashBashSpring Boot 3.4Spring Boot 3.4FastAPIFastAPISpring SecuritySpring SecurityPostgreSQLPostgreSQLRedisRedisDockerDockerRailwayRailwayVercelVercelGitGitJUnit 5JUnit 5TestcontainersTestcontainersMockitoMockitoDaraja API (M-Pesa)Daraja API (M-Pesa)RESTRESTJWTJWTMulti-tenantMulti-tenantRBACRBACObservabilityObservability

04 // DASHBOARD

BY THE NUMBERS

$ gh api /users/kamaukavana-dev○ cached

PUBLIC_REPOS

18

shipped & public

TOTAL_STARS

80+

across all repos

FOLLOWERS

33

and growing

FOCUS

BACKEND

Java · Spring Boot

LANGUAGE DISTRIBUTION

% OF REPOS
Java
46%
Python
28%
JavaScript / TS
12%
HTML / CSS
9%
C++ / C
5%

TECH RADAR — what I reach for, and why

LANGUAGESFRAMEWORKSDATA · INFRATOOLINGJavaSQLPythonBashTypeScriptC++Spring BootSpring SecurityJPA / HibernateJUnit 5KafkaFastAPIPostgreSQLFlywayDockerRedisRailwayOpenTelemetryGitMavenMockitoTestcontainersDaraja / M-PesaVercel

RINGS

  • Adopt— daily drivers
  • Trial— in real projects
  • Assess— actively learning
  • Hold— foundational / occasional

PRODUCTION SERVICES

3 DEPLOYED · BACKEND
LIVEJAVA 21 · SPRING BOOT

CATALOG API

Product & inventory platform: multi-warehouse stock, optimistic locking, Redis caching, S3 media, Flyway migrations.

JavaJavaSpring BootSpring BootPostgreSQLPostgreSQLRedisRedisAWS S3AWS S3DockerDockerFlywayFlyway
health check→repository→
LIVEJAVA 21 · SPRING BOOT

USER MANAGEMENT API

Identity & access management: JWT auth, RBAC, refresh tokens, Redis-backed distributed rate limiting, hardened for production.

JavaJavaSpring BootSpring BootPostgreSQLPostgreSQLRedisRedisDockerDockerJWTJWTSwaggerSwagger
health check→swagger docs→repository→
LIVEPYTHON 3.12 · FASTAPI

GPS TRACKING PLATFORM

Real-time device tracking with geofence breach detection, Telegram alerts, scheduled processing & API-key auth.

PythonPythonFastAPIFastAPIPostgreSQLPostgreSQLSQLAlchemySQLAlchemyAPSchedulerAPSchedulerTelegram BotTelegram BotRailwayRailway
live service→swagger docs→repository→

LIVE WEB APPS

4 SHIPPED · FRONTEND
LIVE

Jibambe Ecommerce

Responsive shopping experience with intuitive product discovery.

ReactTailwind CSSVercel
LIVE

Personal Portfolio

Interactive developer portfolio with immersive 3D experiences.

Next.jsReactThree.jsTailwind CSS
LIVE

Pearl Vista Dental

Polished healthcare presence with a patient-focused experience.

ReactTailwind CSSVercel
LIVE

German AI Chatbot

AI language tutor for conversational German with live feedback.

ReactGemini APIAI
> view full profile on github →

05 // LIVE TERMINAL

TRY IT YOURSELF

A real shell. Type a command and hit enter.

guest@daniel — bash
DanielOS terminal [version 1.0.0]
Connection established · session authenticated.
Type 'help' to list commands. Try 'neofetch'.
guest@daniel:~$

06 // CREDENTIALS

VERIFIED PROOF

$ certifications --status all[ provisioning ]

CERT_001○ PENDING

> cert_001: PENDING

Certification coming soon

[ awaiting upload ]
CERT_002○ PENDING

> cert_002: PENDING

Certification coming soon

[ awaiting upload ]
CERT_003○ PENDING

> cert_003: PENDING

Certification coming soon

[ awaiting upload ]

07 // BLOG

FIELD NOTES

$ posts --status all[ drafting ]

POST_001○ DRAFT

> post_001: DRAFT

Blog post coming soon

[ writing in progress ]
POST_002○ DRAFT

> post_002: DRAFT

Blog post coming soon

[ writing in progress ]
POST_003○ DRAFT

> post_003: DRAFT

Blog post coming soon

[ writing in progress ]

08 // CONTACT

LET'S BUILD.

Available for backend engineering roles in Kenya and remote.

> scan to save my contact

contact.json

daniel@backend:~$ cat contact.json

{

"email": "kavana.daniel1@gmail.com", "whatsapp": "+254796367272", "github": "github.com/kamaukavana-dev", "linkedin": "linkedin.com/in/daniel-kamau-ab9631389"

}

POST /messages

>drop your details, I'll get back to you.

VIA WHATSAPP
DOWNLOAD CV ↓

> if this was useful, fuel the next build

BUY ME A COFFEE

> rate this portfolio

● daniel@backend:~$ exit

© 2026 Daniel Maina — Software Engineer. Built in Kenya.