Backend Engineer · Python · FastAPI · AWS

I help founders & product teams
ship scalable APIs, payments
& real-time systems

3+ years building backend infrastructure in fintech and e-commerce. Based in Kathmandu, Nepal — available for remote engagements globally.

Let's talkSee selected work

Available for remote engagements · AU · EU · US

40%Availability gain
100%Payment coverage expansion
10+Banks deployed
1M+Rows processed
30%Faster page loads
Selected work

Three systems. Real outcomes.

Backend systems built in production — not side projects.

+40% product availability

Real-Time On-Demand Order Platform

Jeevee's product ordering system couldn't handle real-time vendor coordination or dynamic inventory updates. Order processing was batch-based, causing hour-long delays and inventory mismatches that frustrated users and vendors alike.

Designed a real-time order pipeline using RabbitMQ for vendor event propagation, Redis for inventory sync, and WebSockets for live order status. Built the entire system end-to-end with async job workers handling payment settlement, vendor notifications, and inventory reconciliation.

Improved product availability by 40% and order accuracy by 60%. System now processes orders in <2 seconds with 99.9% reliability. Deployed across Jeevee Square retail locations nationwide.

PythonFastAPIRabbitMQRedisWebSocketsPostgreSQLAWS Lambda
100% payment coverage expansion

Multi-Gateway Payment Integration

Jeevee was locked into a single payment provider, limiting customer options and creating vendor lock-in risk. Adding new payment methods required weeks of engineering work and tight coupling to one gateway's API.

Built a payment abstraction layer supporting multiple gateways (card, wallet, BNPL) through a unified interface. Implemented card tokenization for PCI compliance, dynamic QR codes for UPI payments, and AWS Lambda-based webhook handlers for async settlement. Designed it so adding a new gateway takes hours, not weeks.

Expanded payment coverage by 100% (5+ gateway integrations live). Reduced payment-related support tickets by 35%. Enabled business expansion into new markets by supporting local payment methods.

PythonFastAPIAWS LambdaAWS KMSPostgreSQLStripeRazorpay
10+ banking institutions deployed

Banking SaaS Backend Engine

A fintech platform needed to process ATM transaction records and banking data for 10+ banks. The existing system was slow, fragile, and couldn't scale during daily settlement cycles. Non-technical stakeholders (bankers, chartered accountants) couldn't debug failures without engineering intervention.

Built a Flask-based data engine with a unified access layer across plugins, letting each bank's integration work independently. Used profiling tools to eliminate bottlenecks and designed async job queues for long-running reconciliations. Added comprehensive logging and metrics so non-engineers could troubleshoot independently.

Processed 1M+ transaction rows per settlement cycle with <5min latency. Reduced mean-time-to-recovery (MTTR) from 4 hours to 20 minutes. Deployed successfully to 10+ banking institutions with 99.7% uptime.

PythonFlaskPostgreSQLRedisNginxLinux
Work with me

Three ways to work together

Pick the lane that fits your situation.

Full-time roles

Remote · AU / EU / US

Backend IC roles at product companies. I work best in environments where engineering decisions have direct business impact.

Get my CV

Consulting

2-week to 3-month engagements

Backend audits, architecture reviews, AWS cost and performance optimization. I come in, diagnose, and fix.

Discuss a project

Freelance projects

Project or retainer

API builds, payment integrations, performance work. Clear scope, no hand-holding required.

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About

Aliz Acharya — Backend Engineer based in Kathmandu

I'm a backend engineer who likes systems that don't surprise you at 3am.

I've built real-time order processing platforms, payment integrations deployed across 10+ banking institutions, AWS infrastructure that holds up under peak-hour traffic, and ERP migrations that didn't break production. I work primarily in Python, FastAPI, and AWS — and I care more about trade-offs and outcomes than the stack itself.

When I'm not shipping, I'm usually writing about engineering on Medium or building something on the side. Based in Kathmandu, planning to work in any timezone in 2026.

If you're a founder, hiring manager, or team lead with an interesting backend problem — let's talk.

Kathmandu, Nepal · UTC+5:45
Open to remote — AU / EU / US
Planning relocation to Australia
Current role
Software Engineer @ Jeevee Pvt. Ltd.
Education
B.E. Computer Science
Purbanchal University, Nepal
Certifications
Licensed Computer Engineer (NEC)
Generative AI & LLM Architecture (IBM)
Writing

Things I've written

Technical writing on backend engineering, databases, and software thinking.

PostgreSQL indexing strategies illustrated with B-Tree and specialized index types

Beyond B-Tree: Guide to PostgreSQL Indexing Arsenal

When a default B-Tree index isn't enough — a practical guide to GIN, GiST, BRIN, and partial indexes.

Abstract visualization of human and AI collaborative thinking

Beyond Little Helper: How AI Becomes Your Cognitive Leverage

The difference between using AI as an autocomplete and using it as a thinking partner.

Python code showing variable naming conventions and scoping rules

What's in a Name? The System Behind Python Variables

Naming isn't style — it's architecture. How Python's scoping and naming rules shape the programs you write.

View all writing on Medium

Let's build something

Got a backend problem, an architecture question, or just want to talk scope?

alizacharya.1234@gmail.com
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