If you're a founder or product team looking to hire a Chrome Extension developer who can ship a full SaaS around it — this page is your proof of what I've already built.
I built EliteFutBot (formerly FUT Snipe Bot) solo — a Manifest V3 Chrome Extension + Next.js SaaS monorepo that executes automated transfer market sniping in under 250ms. It scaled to 100,000+ active users and generated $1,000,000+ in subscription revenue against one of the most aggressive anti-bot environments in gaming.
This is not a concept. It is a live commercial product with real users, real Stripe subscriptions, and real engineering depth behind it.
Looking to Hire a Chrome Extension or SaaS Developer?
I've already built and shipped a 100k-user Chrome Extension SaaS that generates $1M+ in revenue. I can do the same for your idea. Available now at $20/hr on Upwork.
The Product: What EliteFutBot Does
EliteFutBot is a browser automation Chrome Extension for the EA Sports FC Ultimate Team Web App. It:
- Monitors the transfer market in real-time — intercepting WebSocket packets before listings even appear in the DOM.
- Executes buy orders in < 250ms — faster than any human, and faster than most competing scripts.
- Validates against live Futbin pricing — so users never overbid or buy at a loss.
- Runs 24/7 without bans — using Humanization++ biometric mouse simulation (< 0.01% ban rate across 100k+ accounts).
- Delivers a polished UI — natively inside Chrome's Side Panel, not a floating div injected into the page.
It ships as a full-stack SaaS: the Chrome Extension is paired with a Next.js web dashboard, Stripe subscription billing, Supabase database, and hardware-locked license keys.
How the Auto-Snipe Engine Works
Most automation scripts poll the DOM. EliteFutBot does not. Here is what actually happens when the snipe engine fires:
Step 1 — WebSocket Stream Interception (0ms)
A Main World injected script hooks directly into the browser's WebSocket constructor at page load. Every frame sent or received by EA's servers passes through our listener. When a new transfer listing packet arrives, the engine captures the raw JSON payload — before the page has rendered a single DOM element.
Step 2 — In-Memory Rule Validation (< 5ms)
The raw packet is passed to an in-memory validation engine. No DOM. No network. Pure JavaScript object evaluation against your configured rules:
- Is the buy-now price below your max threshold?
- Is the card rating within your target range?
- Does the Futbin live price margin satisfy your minimum profit target?
- Is a concurrent session already active (race condition protection)?
If all rules pass, the engine fires. If not, the packet is discarded in microseconds.
Step 3 — Humanization++ Execution (5ms – 80ms)
Instead of calling .click() directly on the button element (which triggers behavioral flags), Humanization++ synthesizes a physically realistic mouse interaction:
- Generates a cubic Bézier curve from the current cursor position to a randomized coordinate within the button's bounding box.
- Introduces a dwell delay sampled from a Gaussian distribution (mean: 35ms, σ: 12ms) to simulate natural reaction time.
- Dispatches
pointerdown→mousedown→mouseup→pointerup→clickin the correct sequence with human-accurate timestamps.
This is why EliteFutBot maintained a < 0.01% ban rate at 100,000+ scale — the behavioral fingerprint is statistically indistinguishable from a real person.
Step 4 — Trade Confirmation & Auto-Relist (< 250ms total)
Once the buy request is dispatched, the engine awaits the HTTP response token. On success:
- The sniped card is immediately queued for auto-relist at your target sell price.
- The Side Panel HUD is updated with real-time P&L metrics.
- A Discord webhook fires the trade receipt to your channel.
The full cycle — from packet arrival to confirmed purchase — completes in under 250 milliseconds.
System Architecture
The architecture spans three distinct layers:
Browser Layer: A Main World injected script intercepts raw WebSocket frames from EA's servers. A separate chrome.sidePanel React app provides the user HUD. Both communicate with the Background Service Worker via chrome.runtime.sendMessage.
Extension Engine (Service Worker): Handles sub-250ms snipe execution, Humanization++ mouse physics rendering, Futbin live API polling with 30s refresh intervals, and dynamic RPM throttling to avoid rate-limit bans.
Cloud Backend: EliteFutBot's cloud API handles Stripe subscription management, hardware-bound license validation, and activation telemetry. Discord webhook dispatches and Supabase (PostgreSQL) store 100k+ user account data.
11 Capabilities I Can Deliver for Your Project
Sub-250ms Automation Engine
WebSocket packet interception that fires before the DOM renders. Orders execute in under 250ms with atomic request payloads.
Humanization++ Mouse Physics
Cubic Bézier curve trajectories, Gaussian dwell times, and randomized bounding-box click coordinates. Statistically human.
Full SaaS Billing & Licensing
Stripe monthly/annual subscriptions, hardware-locked license keys, multi-tier plans, and real-time revocation APIs.
Native Side Panel UI
Built on chrome.sidePanel — not an injected floating overlay. Zero DOM pollution, zero style conflicts, update-proof.
Live Market API Integration
Real-time REST API polling with intelligent caching, 30s refresh cycles, and automatic failover on rate-limit responses.
100k+ User Client Architecture
Rate-limit virtualization at the client layer means 100,000+ users run simultaneously without central server bottlenecks.
MV3 Service Worker Keepalive
Offscreen documents with WebSocket heartbeat channels prevent Chrome's 30-second service worker timeout during long automation sessions.
Auto-Relist & Profit Cycling
On successful purchase, the engine automatically relists at your target margin using Futbin price references or fixed percentage rules.
Smart Filters & Capital Guards
Multi-parametric in-memory rule engine validates price, rating, session purchase cap, and balance floors before firing any order.
Main World Script Injection
Executes inside the page's JavaScript context to access native objects (WebSocket, XHR) that are invisible to isolated extension worlds.
CAPTCHA & Soft-Ban Recovery
Detects rate-limit signals, verification walls, and session invalidation events. Pauses gracefully, alerts the user, and auto-resumes.
Why I'm the Developer You Want to Hire
| What You're Evaluating | Typical Agency or Offshore Dev | Pasindu Piumal |
|---|---|---|
| Chrome Extension Experience | May have built one or two demos | Shipped to 100,000+ real users at commercial scale |
| Anti-Ban Track Record | No production data | < 0.01% ban rate proven in hostile environment |
| SaaS Monetization | Knows Stripe docs | Built system that generated $1M+ in subscription revenue |
| Manifest V3 Expertise | Googles Service Worker docs | Engineered MV3 keepalive, offscreen docs, dual-world injection |
| Rate | $80–$200/hr (agency overhead) | $20/hr tracked on Upwork (Top Rated, 100% JSS) |
| Code Ownership | Retained by agency | 100% yours on completion |
What I Can Build For You
Whether you have an idea or an existing product that needs an upgrade:
- New Chrome Extension + SaaS from scratch — I'll architect, build, and ship the full monorepo: MV3 extension + Next.js dashboard + Stripe billing + Supabase backend.
- High-frequency sniping or checkout bots — Ticketing, sneaker drops, domain registration, auction markets, inventory monitoring.
- Anti-detection upgrades — Replacing naive
.click()scripts with biometric physics models that bypass Cloudflare, DataDome, Akamai, and custom WAFs. - Legacy Manifest V2 → V3 migration — Many extensions break with MV3 service worker constraints. I've solved every edge case.
- Scaling an existing extension to SaaS — Adding license management, Stripe billing, and a web dashboard to any existing Chrome extension.
Ready to Build Your Chrome Extension or Automation SaaS?
You've seen the proof. 100k+ users. $1M+ revenue. Sub-250ms. < 0.01% ban rate. Let's build yours — fast, clean, and production-ready.
Frequently Asked Questions
QCan you build a Chrome Extension + SaaS from scratch for my project?
Yes. That's exactly what EliteFutBot is. I'll architect and deliver the full stack: Manifest V3 Chrome Extension, Next.js/React web dashboard, Stripe subscription billing, Supabase database, and hardware-locked licensing. MVP in 1–2 weeks.
QHow do you prevent automation bots from getting banned?
I implement Humanization++ — a physics-based behavioral emulation layer using cubic Bézier mouse trajectories, Gaussian dwell timing, and randomized click coordinates. Combined with dynamic RPM throttling and session fingerprint variation, this kept EliteFutBot under a 0.01% ban rate across 100,000+ accounts.
QWhat is your rate and how quickly can you deliver?
I work at $20/hr tracked on Upwork (Top Rated, 100% Job Success Score), or via fixed-price milestones with escrow. A working MVP is typically delivered in 1–2 weeks. A full Chrome Extension SaaS with billing and dashboard takes 3–4 weeks.
QDo I own the source code and IP when we're done?
Yes, 100%. All source code, repositories, and deployment configurations are transferred to you upon payment. No retainers, no ongoing licensing fees, no lock-in.
QCan you migrate my existing Manifest V2 extension to Manifest V3?
Yes. The most common pain points — background page replacement with service workers, remote code execution policies, webRequest → declarativeNetRequest migration, and service worker keepalive — are all problems I've solved in production.
QCan you add Stripe billing and licensing to an existing extension?
Yes. I can wrap any existing Chrome Extension in a full SaaS licensing layer: Stripe Billing API, hardware-bound activation tokens, multi-seat plan management, and a web dashboard for subscription management — without rewriting your core extension logic.
QWhy not use an agency?
Agencies bill $80–$200/hr, assign junior developers with no real extension production experience, and typically lack Manifest V3 internals expertise. You get me directly — a senior engineer who has shipped to 100k+ real users, generated $1M+ revenue, and maintained sub-1% ban rates in adversarial production environments.