I was tired of "Free" Resume Builders hiding PDFs behind paywalls, so I built an open-source alternative (with Gemini AI & 93+ Speed Score)

Jagadees Var rao — Sat, 04 Jul 2026 07:16:32 +0000

We've all been there:

You spend 45 minutes meticulously filling out your work history, projects, and credentials on a "free" resume builder. You click the shiny "Download PDF" button, and...

💳 "Enter your credit card to activate your $1.99 trial."

It's one of the most frustrating dark patterns on the web.

To solve this, I built ZenResume—a completely free, client-side, open-source resume builder with zero paywalls, zero accounts, and zero tracking.

🚀 Try it out here: ZenResume - Free Resume Builder
⭐ Star it on GitHub: jagadeesvarrao-design/resume-builder

🛑 The Problem vs. 🌿 The Solution

Download PDF:
- Corporate Builders: Hidden behind a sneaky $1.99 trial credit card prompt.
- ZenResume: 100% free, one-click instant download.
Data Ownership:
- Corporate Builders: Saved on remote databases (often sold to recruiters).
- ZenResume: 100% client-side (uses local browser storage + download/import JSON backup files).
Layout Swapping:
- Corporate Builders: Often resets or messes up your input fields.
- ZenResume: Switch templates instantly with zero data loss.
Import System:
- Corporate Builders: Manual, painful copy-pasting.
- ZenResume: Smart Gemini AI text import to populate fields automatically.
Page Load Speed:
- Corporate Builders: Bloated with tracking scripts (mobile score under 40).
- ZenResume: Optimized performance budget (mobile score 93+).

🛠️ The Tech Stack & Architecture

I wanted the app to be as lightweight and fast as possible. There are no heavy frameworks, node modules, or compile steps:

Structure: Semantic HTML5 (with JSON-LD Structured Data Schema for search engines).
Styling: Custom Vanilla CSS3 using a calming HSL color system (Sage & Slate).
Logic: Pure ES6 JavaScript.
State Management: Reactive LocalStorage sync (saves your progress on every single keystroke).

⚡ How I Optimized the Mobile Performance Score to 93+

Since recruiters and search engines favor fast sites, I spent a lot of time optimizing the performance budget:

Forced Reflow Decoupling: I deferred all calculations that query hidden DOM dimensions (clientWidth) to execute only after the editor workspace becomes visible, eliminating startup rendering blockages.
Delayed Font & Library Loads: FontAwesome and Google Fonts are preloaded asynchronously to prevent FCP (First Contentful Paint) delays.
Interaction-Based AdSense Loading: To monetize without blocking the initial page speed crawler, Google AdSense scripts are lazy-loaded only on the first user interaction (scroll, touch, or mouse move).

🎯 Supported Templates

It includes multiple ATS-friendly single-column layouts and our newly released "Modern Double-Column Split" template, designed specifically to pass Applicant Tracking Systems by exporting clean, searchable vector text instead of flat images.

I'd love for you to check it out, star the repo, and let me know what features you want me to code next!

👉 Build your resume on ZenResume

I GOT TIRED OF BROKEN PDF PARSERS , SO I BUILT AN AI RESUME BUULDER USING GEMINI VISION AND VANILLA JS

Jagadees Var rao — Thu, 02 Jul 2026 04:46:52 +0000

As an engineer, I was incredibly frustrated by the modern resume builder market. Every tool either had a terrible UI, demanded a monthly subscription right before I clicked "Download", or used outdated text-parsers that completely broke when I tried to import my old resume.

So, I decided to build my own:
ZenResume

I wanted to challenge myself to make it as fast and lightweight as possible, so I skipped React and Next.js entirely. The entire application is built using Vanilla JavaScript (ES6) and Firebase for authentication.

The Coolest Part: Gemini Vision API The biggest challenge with resume builders is extracting data from old PDFs. Traditional parsers fail if the PDF is image-based. I solved this by integrating Google's Gemini 2.5 Flash Vision API. When you upload a resume, ZenResume takes a picture of it, sends it to Gemini with a strict JSON schema, and Gemini visually extracts your history and maps it perfectly into my ATS-compliant templates.

Handling AI Rate Limits Because Gemini's free tier only allows 15 requests per minute, I implemented a Client-Side Exponential Backoff algorithm. If the AI is busy, the fetch request silently catches the 429 error, waits 3 seconds, and retries automatically without crashing the UI!

It's 100% Free I built this to help the community, especially freshers looking for tech jobs. You can export high-quality A4 PDFs without watermarks.