Mamun.
GitHub
Expertise

Skills & technologies

From full-stack web and backend engineering to cloud infrastructure, microservices, DevOps, and application security — here's my complete technical stack.

01

Full-Stack Web Development

End-to-end web application development — from responsive, accessible frontends to robust backend APIs. I build modern web apps that perform at scale with clean architecture and best practices.

React / Next.jsNode.js / ExpressTypeScriptREST & GraphQL APIsPostgreSQL / MongoDB
02

Backend Development

Scalable backend systems with clean architecture. Database design, API development, authentication, and server-side logic that powers your applications reliably under heavy load.

Node.js / ExpressPythonPostgreSQL / MongoDB / RedisAuthentication & AuthorizationPerformance Optimization
03

Microservices Architecture

Designing and building distributed systems with microservices. Event-driven architecture, inter-service communication, and independent deployability for complex, large-scale applications.

Service Design & DecompositionMessage Queues (RabbitMQ / Kafka)API GatewayEvent-Driven ArchitectureContainerized Services
04

Third-Party & AI Integrations

Connecting your application to the services it needs — payment gateways, AI models, messaging platforms, analytics, and more. I handle the full integration lifecycle from auth to error handling.

AI / LLM APIs (OpenAI, Claude)Payment (Stripe / PayPal)Email & SMS (SendGrid / Twilio)OAuth & SSO ProvidersMaps, Analytics & Webhooks
05

DevOps & CI/CD

Automating your development workflow from commit to production. I set up containerized environments, build reliable pipelines, and ensure your team ships fast with confidence.

Docker & KubernetesCI/CD (GitHub Actions / GitLab CI)Infrastructure as Code (Terraform)Automated Testing in PipelineEnvironment Management (Dev/Staging/Prod)
06

Cloud & Deployment

Getting your application live and keeping it running. Server setup, domain configuration, SSL, scaling, and monitoring — everything needed for a production-grade deployment.

AWS / DigitalOcean / VPSNginx, SSL & Domain SetupZero-Downtime DeploymentAuto-Scaling & Load BalancingMonitoring & Logging (Grafana / Prometheus)
07

Application Security

Building security into your applications from day one. I review code, harden authentication flows, secure APIs, and ensure your app follows industry best practices to prevent real-world attacks.

Secure Code ReviewOWASP Top 10 ProtectionAuth & Session SecurityAPI Security & Rate LimitingInput Validation & Sanitization
08

Security Auditing & Penetration Testing

Finding vulnerabilities before attackers do. I conduct thorough security assessments, simulate real-world attacks, and deliver actionable reports with clear remediation steps.

Vulnerability AssessmentPenetration Testing (Web & Network)Security Reporting & RemediationCompliance (SOC2 / GDPR)Incident Response Planning

Technologies I work with

React
React
Next.js
Next.js
TypeScript
TypeScript
Node.js
Node.js
Python
Python
GraphQL
GraphQL
PostgreSQL
PostgreSQL
MongoDB
MongoDB
MySQL
MySQL
Docker
Docker
Kubernetes
Kubernetes
AWS
AWS
GCP
GCP
NestJS
NestJS
Angular
Angular
Vue
Vue
Go
Go
Java
Java
C#
C#
PHP
PHP

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