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Kazi Efazul Karim

@kaziefazulkarim

Senior Full-Stack Engineer with 6+ years of experience building SaaS and enterprise applications across diverse tech stacks and cloud technologies.

Bangladesh

Message

What I'm looking for

I’m looking for a remote, async-friendly team where I can architect production systems end-to-end, lead engineering execution, and mentor others—especially roles involving SaaS/enterprise complexity, performance, and security-minded feature delivery.

I’m a Senior Full-Stack Software Engineer with 6 years building and leading production SaaS and enterprise systems across React/TypeScript, Node.js, .NET, and Python/FastAPI on PostgreSQL/SQL Server. I architect end-to-end solutions that ship reliably—owning both backend design and responsive UIs—and I’m especially effective in complex, security-sensitive domains.

At Fionetix, I led a 5+ engineer team and set technical direction and code-review standards for full-stack SaaS and internal products (TypeScript, React, Next.js, Express.js, ASP.NET Core), improving delivery quality and cutting average page-load time by ~30%. I also co-founded BitSic, where I design and build client-ready products and internal tools, including a prompt-orchestrated Python pipeline for automated multi-page reports and integrations with Stripe and OpenAI APIs—while mentoring and partnering closely with product and stakeholders to turn UX into production APIs.

Experience

Work history, roles, and key accomplishments

Current

Lead Full-Stack Developer

Current

BitSic

May 2022 - Present (4 years 1 month)

Co-founded and led an independent development studio, directing contractors and owning architecture for client-ready products and internal tools. Built full-stack applications and dashboards with React/TypeScript, Node.js, GraphQL, and PostgreSQL, including a Python prompt-orchestrated pipeline for automated multi-page report generation and Stripe/OpenAI integrations.

React TypeScript GraphQL PostgreSQL Python API Integration Stripe Billing Prompt Engineering

Full-Stack Software Engineer

Fionetix

Jun 2024 - Jan 2026 (1 year 7 months)

Led a 5+ engineer team and owned end-to-end architecture for full-stack SaaS and internal products, setting technical direction and code-review standards. Partnered with product and design to deliver REST APIs and responsive UIs, and drove performance improvements that cut average page-load time by ~30% across key React/Next.js apps.

TypeScript React Next.js ASP.NET Core .NET REST APIs Performance Optimization Code Review Team Leadership

Frontend Developer

Upwork

Feb 2021 - Mar 2022 (1 year 1 month)

Delivered 10+ client projects (dashboards, SaaS apps, and business automation) with 100% on-time completion and positive client feedback, owning timelines and client communication end-to-end. Implemented responsive design and cross-browser compatibility to ensure consistent user experience across devices and platforms.

React TypeScript Responsive Design Browser compatibility Client Communication State Management Web APIs