SENIOR PYTHON BACKEND ARCHITECT & AUTOMATION SPECIALIST

High-Throughput Microservices, vendor POS bridges & Autonomous Pipelines

5+ years architecting fault-tolerant Python backends, retail POS integration bridges, stealth data extraction clusters, and high-concurrency automation systems with 99.9% uptime.

Explore Systems

172+ Deployments & Automations

5+ Yrs Python Systems Architecture

45M+ Monthly Processed Events

99.9% Production SLA

FastAPI + Celery Production Ready • Asynchronous

01import hmac, hashlib02from fastapi import FastAPI, Header, HTTPException03from core.queues import celery_app04from core.database import atomic_inventory_lock0506app = FastAPI(title="OmniVendor POS Gateway", version="3.2.0")0708@app.post("/webhooks/clover-sync")09async def sync_pos_transaction(payload: dict, x_signature: str = Header()):10    # Verify cryptographic HMAC signature from register hardware11    expected = hmac.new(SECRET_KEY, str(payload).encode(), hashlib.sha256).hexdigest()12    if not hmac.compare_digest(expected, x_signature):13        raise HTTPException(status_code=401, detail="Invalid HMAC signature")1415    # Atomic multi-channel stock lock across physical and digital storefronts16    async with atomic_inventory_lock(payload["sku"]):17        task = celery_app.send_task("reconcile_stock", args=[payload["sku"], -1])18        return {"status": "ENQUEUED", "task_id": task.id, "latency_ms": 14}

Playwright + JA4 Production Ready • Asynchronous

01from playwright.async_api import async_playwright02from core.tls import JA4Profile, ResidentialMesh0304class StealthEngine:05    """Anti-detection browser cluster evading Turnstile & DataDome."""06    def __init__(self):07        self.proxies = ResidentialMesh(protocol="socks5", max_ping=35)0809    async def fetch_protected_feed(self, target_url: str) -> dict:10        endpoint = await self.proxies.get_healthy_endpoint()11        async with async_playwright() as pw:12            browser = await pw.chromium.launch(13                proxy={"server": endpoint.url},14                args=["--disable-blink-features=AutomationControlled"]15            )16            ctx = await JA4Profile.apply_camoufox(browser)17            page = await ctx.new_page()18            await page.goto(target_url, wait_until="networkidle")19            return await page.evaluate("() => window.__APP_DATA__")

AsyncIO + Token Bucket Production Ready • Asynchronous

01import asyncio02from core.defense import HeuristicEngine, RateLimiter03from core.audit import WALSnapshotBus0405class SystemEventGateway:06    """High-concurrency microservice event dispatcher & defense engine."""07    def __init__(self):08        self.heuristics = HeuristicEngine(window=3.0, threshold=12)09        self.limiter = RateLimiter(capacity=50, refill_rate=25.0)10        self.wal_bus = WALSnapshotBus(storage_mode="sqlite_wal")1112    async def dispatch_event(self, event_id: str, payload: dict):13        if not await self.limiter.acquire(tokens=1):14            await self.wal_bus.record_burst_overflow(event_id)15            return {"status": "RATE_LIMITED", "retry_after_ms": 18}16        return await self.heuristics.process_atomic(payload)

ENGINEERING PROFILE • EXPERTISE

Python Systems Architect & Automation Specialist

5+ years architecting resilient Python backends, high-throughput commercial vendor bridges, and autonomous intelligence systems.

I am Samyog Dhakal (RaaSki), a Python systems developer based in Kathmandu, Nepal, with over 5 years of focused engineering experience in asynchronous backend architecture, commercial retail integrations, and distributed automation pipelines.

Over the past half-decade, I have architected and deployed over 172 robust systems for clients across e-commerce, commercial retail, cybersecurity, and community infrastructure. My work centers on high-throughput microservices, sub-second POS inventory synchronization between physical store registers and online channels, and anti-abuse security engines.

I take pride in writing fault-tolerant, clean Python code that operates 24/7 without intervention—handling concurrency spikes, HMAC signature validations, and distributed task retries quietly in the background.

High-Concurrency Microservices

Asynchronous event loops, Redis stream backbones, token-bucket rate limiters & sub-40ms latency.

POS Ingestion & Inventory Locks

Atomic database state locks synchronizing physical store registers with digital checkouts.

Python Backends & Microservices

8 Tools

Python 3.12+ (asyncio) FastAPI & Async WebSockets Redis Streams & Pub/Sub Celery Task Queues PostgreSQL & SQLite (WAL) HMAC Cryptographic Signing Docker & Systemd Daemons Token Bucket Rate Limiters

Vendor POS & Retail Commerce

8 Tools

POS Ingestion (Square, Clover) Multi-Store Inventory Locks Shopify / WooCommerce Webhooks Automated Invoicing & Stripe Crypto Escrow Gateways Sub-Second Stock Depletion Discord & Slack Webhooks PDF Statement Generation

OSINT Intelligence & Stealth Scraping

8 Tools

Playwright & Camoufox TLS JA3 / JA4 Spoofing Cloudflare Turnstile & DataDome Canvas 2D / WebGL Noise Dark-Web & Breach Crawlers Passive DNS Entity Resolution Residential SOCKS5 Proxy Pools Automated Abuse Takedowns

PRODUCTION PORTFOLIO

Enterprise Systems & Automation Pipelines

A curated showcase of fault-tolerant Python backends, retail POS integration pipelines, stealth web extraction clusters, and OSINT reconnaissance meshes.

cerberus_intel.py Python 3.12

01async def scan_darkweb_leaks(target_domain: str) -> list[ThreatReport]:02    session = await proxy_pool.get_camoufox_session()03    leaks = await session.query_onion_indexes(target_domain)04    return [ThreatReport.parse(l) for l in leaks if l.score > 0.85]05    # Dispatches instant alert to webhook within 180ms

OSINT, Threat Reconnaissance & Dark-Web Intel

Cerberus OSINT — Threat Intelligence & Breach Surveillance Mesh

Multi-threaded reconnaissance crawler indexing paste sites, credential breaches, and unauthorized vendor impersonations across web networks. Alerts within 180ms of leak discovery with automated forensic reporting.

Python 3.12asyncioPlaywright HeadlessRedis StreamsOSINT ReconWebhook Alerts

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aegis_sentinel.py Python 3.12

01@bot.event02async def on_member_join(member: discord.Member):03    if anomaly_detector.is_raid_spike(member.guild.id):04        await member.kick(reason="Anti-raid quarantine trigger")05        await audit_bus.publish("RAID_INTERCEPT", guild_id=member.guild.id)

High-Concurrency Backend & Anti-Raid Defense

Aegis Sentinel — Enterprise Community & Merchant Defense Gateway

Fault-tolerant security gateway engineered for 100k+ member platforms and merchant infrastructure. Features behavioral heuristics for raid interception, instant token quarantine, and automated member rollback (1,000+ member recovery in 4s).

PythonAsync Event LoopRedis Pub/SubAnomaly HeuristicsSQLite WALHMAC Verification

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pos_bridge.py Python 3.12

01@app.post("/webhooks/clover-checkout")02async def handle_pos_checkout(payload: POSWebhook, hmac_sig: str = Header()):03    verify_hmac_sha256(payload, hmac_sig)04    await celery_app.send_task("sync_inventory", args=[payload.sku, -1])05    return {"status": "SYNCED_DISPATCHED", "remaining_stock": payload.qty}

Retail POS Automation & Inventory Reconciliation

OmniVendor Bridge — Real-Life POS & Multi-Channel Vendor Pipeline

High-throughput vendor integration pipeline connecting physical brick-and-mortar POS hardware (Square/Clover) with Shopify, multi-channel marketplaces, and automated Stripe/crypto settlement webhooks with sub-second stock depletion alerts.

PythonFastAPIPOS Webhook BridgeCeleryStripe APIPDF Invoicing

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stealth_cluster.py Python 3.12

01async def fetch_protected_feed(url: str, proxy: SOCKS5Endpoint) -> str:02    async with async_playwright() as p:03        browser = await p.chromium.launch(proxy={"server": proxy.url})04        context = await apply_ja3_fingerprint(browser, "TLS_CHACHA20")05        return await (await context.new_page()).goto(url)

Anti-Detection Browser Clusters & High-Volume Scraping

GhostProxy Stealth Engine — Cloudflare Turnstile & DataDome Evasion

Autonomous browser crawler framework utilizing fingerprint spoofing (TLS JA3/JA4, Canvas 2D noise, WebGL uniform spoofing) with Celery distributed async queues processing 25M+ requests monthly with 0 bans.

PythonPlaywrightCamoufoxTLS JA3/JA4Residential SOCKS5Anti-Detect

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discopay_escrow.py Python 3.12

01@bot.tree.command(name="checkout", description="Purchase VIP store item")02async def checkout_command(interaction: discord.Interaction, item_id: str):03    invoice = await stripe_gateway.create_invoice(item_id, interaction.user.id)04    await interaction.response.send_message(embed=invoice.to_embed(), ephemeral=True)05    # Provisions Discord role automatically upon webhook settlement

Automated Escrow & Commerce Workflows

Discopay Escrow & Commerce Engine — Multi-Channel Storefront Automation

Custom commerce gateway allowing vendors to sell physical & digital stock seamlessly with instant invoice generation, role provisioning, payment escrow, and dispute arbitration ticketing.

PythonFastAPIStripe WebhooksCrypto EscrowPostgreSQLTicket Dispatcher

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specter_takedown.py Python 3.12

01async def audit_brand_infringements(brand: str) -> None:02    rogue_domains = await dns_recon.find_typosquats(brand)03    for domain in rogue_domains:04        dossier = await generate_abuse_pdf(domain)05        await registrar_api.submit_takedown(domain, dossier)

Automated Brand Protection & Reconnaissance

SpecterWatch — Brand Protection & Rogue Clone Surveillance

Automated surveillance crawler identifying typosquatted vendor domains, counterfeit listings, and fake community portals impersonating official vendors, instantly generating automated takedown dossiers.

PythonScrapyBeautifulSoup4WHOIS OSINTReportLab PDFTakedown Alerts

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BACKEND INFRASTRUCTURE & CAPABILITIES

Backend Architecture & Automation Systems

Specialized enterprise-grade automation modules, high-throughput microservices, anti-abuse security shields, and retail vendor data engines built with Python.

172+

Automations & Backends Delivered Active client servers & custom pipelines

$65K+

Client Commercial Volume Automated invoices, retail POS & escrow systems

45M+

Monthly Processed Events Redis streams, webhooks & burst pipelines

99.9%

Production Reliability Resilient background daemons & retry queues

EVENT-DRIVEN BACKENDS

High-Concurrency Event Gateways & Defense

Architected custom asynchronous microservices and event dispatchers handling millions of monthly events with token protection and instant anomaly mitigation.

Anti-Abuse & Rate-Burst Defense: Behavioral anomaly detection halts mass rogue requests or payload floods within 120ms.
Automated State Rollback Engine: Restores corrupted configurations and permission states in under 4 seconds via continuous SQLite WAL snapshots.
Native Commerce & Escrow: Automated order ticket creation, crypto/Stripe checkout, and instant multi-channel webhook reconciliation.

FastAPI • Redis Pub/Sub • Token Bucket • SQLite WAL

RETAIL & E-COMMERCE

Real-Life Retail Vendor & POS Pipelines

Bridging physical brick-and-mortar storefronts with digital inventory channels, automated wholesale restocking, and webhook dispatchers.

POS to Multi-Channel Sync: Ingests in-store barcode & Square/Clover checkouts, instantly updating Shopify & Discord channels.
Automated Supplier Arbitrage: Headless scrapers monitor wholesale supplier price fluctuations and calculate margins automatically.
Cryptographic PDF Invoicing: Generates tamper-proof customer receipts with SHA-256 HMAC verification tokens.

FastAPI • POS Webhooks • Celery • Stripe API • ReportLab

OSINT & RECONNAISSANCE

OSINT & Threat Intelligence Mesh

Autonomous surveillance crawlers monitoring dark-web leaks, credential dumps, and rogue brand impersonation across public networks.

24/7 Leak & Dump Surveillance: Scrapes pastebins, forums, and code repositories to detect compromised vendor keys in real time.
Vendor Impersonation Detection: Detects typosquatted domain registrations and fake Discord clones scamming customers.
Passive Entity Resolution: Correlates cross-platform usernames, historical DNS logs, and cryptographic wallet signatures.

Python 3.12 • Playwright • WHOIS Recon • Forensic Alerting

STEALTH EVASION

Anti-Bot Evasion & Scraper Swarms

Defeating aggressive commercial bot-defense systems through realistic human behavior synthesis and randomized network fingerprints.

Turnstile & DataDome Evasion: Overrides TLS JA3/JA4 ciphers, HTTP/2 pseudo-headers, and navigator spoofing.
Human Canvas & Audio Noise: Injects mathematical jitter into HTML5 Canvas and WebGL contexts to bypass hardware profiling.
Residential Proxy Mesh: 64-node rotating residential SOCKS5 pool maintaining 100% bypass rate with zero bans.

Camoufox • Playwright • JA3 Spoof • Residential SOCKS5

PRODUCTION SLAs & CLIENT WORKFLOW

Production Engineering Standards & Delivery Lifecycle

Enterprise security primitives, verified concurrency guarantees, and a structured 4-phase delivery pipeline engineered for high-uptime commerce and bot operations.

Zero-Token Risk

Zero-Token Storage & HMAC Verification

All inbound POS and payment webhooks require SHA-256 HMAC signature verification. Discord bot tokens and vendor credentials run strictly in ephemeral memory—never serialized to disk or exposed in telemetry logs.

50k+ Events / Min

High-Concurrency Burst Protection

Engineered with asynchronous token-bucket rate limiters that smooth volatile incoming spikes during drop events. Prevents Discord 429 gateway lockouts and maintains dispatch latency under 40ms.

ACID Row Locks

Atomic Multi-Channel Inventory Lock

Row-level database locks ensure physical in-store POS barcode registers, online Shopify webhooks, and Discord VIP bots never oversell stock items during simultaneous high-speed checkouts.

<4s Rollback

Automated Snapshot & State Rollback

Automated SQLite WAL-mode snapshots continuously record server roles, permission hierarchies, and channel configs. If a rogue admin event occurs, full state restores automatically in under 4 seconds.

STRUCTURED CLIENT ENGAGEMENT LIFECYCLE

4-STAGE PRODUCTION ROADMAP

STAGE 01 Day 1 – 2

Architecture & Threat Audit

Full analysis of Discord permission models, POS API endpoints, rate limits, and security vulnerabilities to prevent edge-case failures.

STAGE 02 Day 3 – 7

Sandboxed Gateway Prototype

Building the bot gateway and mocked POS webhooks in an isolated staging server with end-to-end event dispatch verification.

STAGE 03 Day 8 – 10

Stress & Anti-Bot Hardening

Simulating 10,000 req/min traffic bursts, browser TLS JA3/JA4 fingerprint verification, and memory leak profiling under maximum concurrency.

STAGE 04 Launch & Beyond

Production Daemon Deployment

Hardened Linux systemd service provisioning, automated crash restart watchdogs, SSL cert pinning, and 24/7 Discord status pings.

GET IN TOUCH • CONSULTATION

Architect Your Systems & Pipelines

Have a specialized Python backend, vendor POS integration, or stealth data extraction project? Drop your specifications below for a prompt architectural assessment.

Direct Technical Email

contact@codewithraa.me

Location & Availability

Kathmandu, Nepal (UTC +5:45) • Worldwide Remote

Direct Communication Portals