Full Stack Developer & Creative Engineer

Hi, I'm Asfandiyar Khan

I craft beautiful, performant web applications that blend creativity with engineering precision. Over 11 years of turning complex ideas into seamless digital experiences.

About Me

Blending creativity with engineering to build exceptional digital experiences

I'm a senior full-stack developer with over 11 years of experience creating intuitive, responsive, and performant web applications. My passion lies in transforming complex design concepts into seamless user experiences — I apply creativity and logic simultaneously, and my process starts with a pen and paper and ends with a robust QA process.

With deep expertise in React, Node.js, and modern JavaScript frameworks, I specialize in developing scalable applications that prioritize accessibility, performance, and clean architecture. I'm an open source contributor and a firm believer that code is poetry.

Beyond coding, I'm passionate about staying on the cutting edge of web technologies and contributing to the development community through mentorship and knowledge sharing.

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Experience

A journey of building products that matter

Jun 2019 — Present
Full Stack Developer
1&1 IONOS · Berlin, Germany
Architected, designed, and built the mobile version of IONOS's cloud flagship product — Data Center Designer (DCD) — using React, Redux, and Material UI. Led frontend architecture decisions for a product serving thousands of cloud infrastructure customers.
Nov 2017 — May 2019
Senior Software Engineer
iPlex · Chicago, USA
Led MEAN/MERN stack development at a top-ranked digital agency. Responsible for React & Redux architecture with Node.js backends, UX flows design and implementation, and building fully responsive, cross-browser compatible interfaces.
Aug 2016 — Oct 2017
Software Engineer
BroadPeak Technologies
Designed and developed e-commerce solutions end-to-end — from module architecture to deployment on live servers. Coordinated across design, QA, and project management teams to deliver high-quality products.
Aug 2015 — Jul 2016
Developer Fellow
The World Bank
Developed a document and workflow management system for KPITB (Khyber Pakhtunkhwa Information Technology Board) as part of a fixed-term fellowship program.

Tech Stack

Technologies I work with every day

Featured Projects

A selection of work I'm proud of

Praedo Institute — LMS

Rebuilt a course delivery & management system from the ground up for the leader in online real estate and mortgage training. Features eCommerce, media integration, mandatory assessments, and PDF manipulation — serving thousands of professionals.

ReactCakePHPBootstrapeCommerceLAMP

IONOS DCD Mobile

Architected the mobile version of IONOS's cloud flagship product Data Center Designer with React, Redux & Material UI.

ReactReduxMaterial UICloud

Mobile Guardian

Built AngularJS UI with i18n/l10n, modular system for expansion, custom components, API integration & auth.

AngularJSi18nREST API

Sentius Technologies

Business intelligence platform with third-party data integrations, data warehouse analytics, and real-time SaaS dashboards for healthcare practices.

SOAREST APIsSaaSAnalytics

Madra Learning — EdTech Platform

SaaS-based eLearning and assessment software serving thousands of university students. SOA architecture on AWS (Lambda, Kinesis, S3) with secure assessments, metacognitive exercises, and personalized analytics. Served as CTO providing architecture, development management, and strategic planning.

AngularAWS LambdaS3KinesisBootstrapLAMP

Kids Blog

Engineered visitor maps, Google Account SSO, and a class code system for 3M+ users on the WPMU platform.

AngularJSElasticsearchWordPress

Dizzle

Social ranking signal marketplace with thousands of daily active users. Migrated from LAMP to Node.js & MongoDB as the platform scaled.

ReactNode.jsMongoDBFlockDB

Costa Vida

Corporate website with online ordering for one of the fastest growing Fresh Mex franchises. Tens of thousands of visitors.

ZendMagentoPHPMySQL

Open Source

Code is poetry — here are some of my contributions

Dev Tools

Utilities I built for developers

API Viewer

Interactive OpenAPI/Swagger documentation viewer. Paste any spec URL and explore endpoints, schemas, and responses in a clean focused interface.

Open Tool

CSV Editor

Feature-rich CSV editor with dark/light mode, intuitive grid layout, import/export, and a modern UI for quick data manipulation without leaving the browser.

Open Tool

Time Zone Converter

Compare times across multiple time zones with a live clock, DST indicators, meeting overlap planner, difference matrix, and a 24-hour visual timeline.

Open Tool

JSON Formatter

Format, validate, minify, and explore JSON with syntax highlighting, interactive tree view, path copying, and detailed structure statistics.

Open Tool

Regex Tester

Test regular expressions in real-time with match highlighting, capture groups, replace mode, and a built-in library of common patterns.

Open Tool

Color Palette

Generate harmonious color palettes, convert between HEX/RGB/HSL/CMYK, check WCAG contrast accessibility, and explore shades and tints.

Open Tool

AI Token Counter

Count tokens, estimate API costs, compare model context windows, and optimize prompts for GPT, Claude, Gemini, Llama, and more.

Open Tool

Text Diff Checker

Compare two text blocks side-by-side or inline with word-level highlighting, diff statistics, and options to ignore whitespace or case.

Open Tool

Encode / Decode

Base64, URL, HTML entities, JWT decode, SHA hash generation, and UUID generator — a complete encoding and decoding toolkit.

Open Tool

Markdown Editor

Write Markdown with instant live preview, formatting toolbar, table of contents, export to HTML, word count, and keyboard shortcuts.

Open Tool

Password Generator

Generate secure passwords, passphrases, and PINs with strength analysis, entropy calculation, history tracking, and bulk generation.

Open Tool

Get In Touch

Let's build something amazing together

Let's talk about your next project.

Whether you have a question, a project idea, or just want to say hi — my inbox is always open. I'll get back to you as soon as I can.

Location
Berlin, Germany
Website
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