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Engineering customer-facing product demos

👋 Hello, I'm

Rasel Hasan

Software Engineer @ Optimizely

I engineer customer-facing demos of Optimizely One — the AI-powered platform behind 10,000+ brands like Nike, PayPal, and Zoom — turning real customer use cases into working software.

~/ Dhaka, Bangladesh tz GMT+6
Rasel Hasan
TS
AWS
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/ about

Engineer with product obsession.

Bio · v3.2
$ whoami
→ Software Engineer · Dhaka, Bangladesh
$ cat focus.txt
→ React · Next.js · Astro · Svelte
→ customer-facing eng · agentic AI · product mindset

At Vivasoft I built frontend that had to hold up in production — schema-based form architecture, PDF pipelines on web workers, micro front-ends serving 500+ companies. Now I'm a Demo Engineer at Optimizely, where the customer is in the room: I turn real use cases into working demos of Optimizely One, partnering daily with Product, Engineering, and GTM. That seat is deliberate — I'm building a product mindset from the engineering side, growing toward leadership by owning outcomes, not just code.

3 +
Years Experience
10 k+
Brands on Optimizely One
500 +
Companies on Pi-HR
FE
Frontend Specialist
/ stack
TypeScript JavaScript React Next.js Astro Svelte GraphQL Tailwind CSS Redux Toolkit Node.js REST APIs Micro Frontends
/ projects

Selected work, shipped.

01 · 2025 · fintech

Xsolla

Live gaming data → downloadable PDF reports

Dynamic PDF generation module rendering real-time, country-specific gaming data into multi-page exportable reports — custom charts, Unicode and rich-text support, optimized with web workers and caching to match the Figma design system.

TypeScriptReactReact-PDFWeb WorkersCSS
xsolla.app
// pdf-generator/render.ts
PDF · v2
02 · 2024 · saas

Pi-HR

HRM SaaS for 500+ companies

HRM platform on a micro front-end architecture — searchable, sortable data tables, complex forms with layered validation, and REST API integrations across the product.

ReactTypeScriptMicro FrontendsREST APIs
pi-hr.app
504Companies
2.4kUsers
99.9%Uptime
Employee
Department
Status
Aisha Khan
Engineering
Active
Tahmid R.
Design
Active
Nadia I.
Product
Leave
Sumon H.
Engineering
Active
03 · 2024 · commerce

Poptrigg

Shopify popups & discounts, from scratch

Popup and discount platform built from scratch — live-preview popup editors, complex forms with React Hook Form and Zod, Shopify and custom APIs via RTK Query, and Apex-charts analytics dashboards.

TypeScriptReactTailwindShadcnRTK Query
poptrigg.app
/ experience

Career so far, in motion.

Demo Engineer II

Optimizely · full-time
May 2026 — Present
  • Engineer customer-facing demos of Optimizely One, the AI-powered digital experience platform used by 10,000+ brands including Nike, PayPal, and Zoom.
  • Build and maintain demo environments in React, Next.js, Astro, and Svelte — translating real customer use cases into interactive, technically accurate experiences.
  • Configure agentic marketing workflows with Opal — personalization, experimentation, generative AI — to demonstrate measurable business outcomes in live and recorded demos.
  • Partner with Product, Engineering, and GTM teams across global locations to keep demos aligned with product roadmap and sales strategy.

Software Engineer L-II

Vivasoft Limited · full-time
Jan 2025 — Feb 2026
  • Built the frontend for Novara, an AI recruitment platform — schema-based resume builder with real-time preview, AI resume evaluation, multi-criteria job discovery.
  • Shipped Xsolla World Map's PDF module — live, country-specific gaming data rendered into multi-page reports with custom charts and Unicode support.
  • Optimized report generation with caching, reusable hooks, and web workers, aligning the output with the Figma design system.
  • Refactored Xsolla's customization demo — mobile-friendly stepper, auto-scroll hero carousel, and an accessible, theme-aware header and footer with API integration.

Software Engineer L-I

Vivasoft Limited · full-time
Jul 2023 — Dec 2024
  • Built searchable tables and complex validated forms for Pi-HR, an HRM SaaS serving 500+ companies on a micro front-end architecture.
  • Boosted Resume Builder's PDF rendering by 60% with web workers and React-PDF; shipped a Quill-to-PDF parser and Next-Auth roles.
  • Built Poptrigg from scratch — Shopify popups and discount flows with live previews, popup editors, and Apex-charts analytics dashboards.

Software Engineering Intern

Samsung R&D Institute Bangladesh · full-time
Oct 2022 — Feb 2023
  • Worked on Samsung Notes app to enhance performance.
  • Passed Samsung's global SWC Advanced Level coding test.
  • Contributed to Samsung Smart Ring research.
/ education

Where it all started.

BSc (Engg)

Computer Science & Engineering

Sylhet Engineering College
2018 — 2022
Champion, NSU Inter-University Hackathon 2020
ICPC Asia Dhaka Regionals, 2020 & 2021
1600+ problems solved; CodeChef max rating 1907
Published at ICERIE 2023 — contest rating prediction, 90% accuracy
/ coursework
AlgorithmsWeb EngineeringDistributed SystemsDBMS
ESC
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