Available for Opportunities

Architecting distributed systems & AI backends that scale.

Lead Software Engineer / Tech Lead with 7+ years designing and delivering enterprise systems on .NET, Python, AWS, and Azure.

Get in Touch View My Work
5x Capacity Scaled
7+ Years Experience
30% Query Optimization
AWS Solutions Architect

Passionate about engineering excellence and clean code

I'm a Lead Software Engineer / Tech Lead with 7+ years designing and delivering enterprise systems on .NET, Python, AWS, and Azure. I own solutions end to end on the technical side, from pre-sales proposals, team allocation, and costing to high-level design and production, and my architecture work is grounded in hands-on performance engineering: I've taken critical APIs from ~24s response times to milliseconds and scaled capacity 5x.

I work across two sibling verticals. At CAS Total Solutions, I'm Lead Software Engineer for Frappe-based banking systems: I architected the Signature Middleware for Nepal SBI Bank, integrating cheque-clearing with core banking, and took over technical ownership of the Loan Management System for Bhutan's National Pension and Provident Fund (NPPF). At CAS Techno Sales (Frost Digital Ventures), I'm Tech Lead for Frost & Sullivan: I architected "7 Gates", a multi-product microservices platform with SSO across six products, I'm running the AWS-to-Azure migration of their platforms, and I own technical proposals for prospective clients. Previously at Innovate Tech, I was a backend engineer on My Second Teacher, a globally deployed EdTech platform.

I hold an MSc in IT & Applied Security and a BSc First Class Honours in Computing from London Metropolitan University, and I'm an AWS Certified Solutions Architect - Associate. Alongside my engineering work, I lead a 5-person engineering team and supervise final-year projects at Islington College.

Location
Kathmandu, Nepal
Phone
+977-9860028647
Email
rozeennakarmi5@gmail.com
Specialization
Solution Architecture & Performance Engineering
Website
rozeen.com.np
LinkedIn
linkedin.com/in/rozeen-nakarmi

Tools & technologies I work with

Languages & Frameworks

  • C#
  • Python
  • TypeScript
  • .NET Core
  • ASP.NET Core
  • Web APIs
  • EF Core
  • LINQ
  • SignalR
  • ABP
  • FastAPI
  • Frappe

Databases

  • PostgreSQL
  • SQL Server
  • DynamoDB
  • Redis

Cloud

AWS
  • Lambda
  • EC2
  • S3
  • RDS
  • Aurora
  • SQS
  • SNS
  • SES
  • CloudWatch
Azure
  • Azure

Auth & Messaging

  • OpenIddict
  • Keycloak
  • OAuth2/OIDC
  • JWT/JWKS
  • REST
  • gRPC
  • RabbitMQ

Practices

  • Solution Architecture & HLD
  • Microservices
  • System Design
  • Cloud Migration
  • AI/ML Integration
  • Performance Optimization
  • Security Assessment
  • Technical Proposals & Costing
  • Team Leadership
  • Mentoring

Projects that made an impact

  1. Architected a multi-product microservices platform for Frost & Sullivan: 7 application services plus AWS Lambda workers, with a centralized AuthServer (OpenIddict, OAuth2/OIDC) providing SSO across 6 products and decentralized JWT/JWKS validation.

    Launched enterprise-wide to Frost & Sullivan's global workforce

    • .NET Core
    • OpenIddict
    • OAuth2/OIDC
    • JWT/JWKS
    • Microservices

  2. Architected a Frappe-based middleware that embeds account, balance, signature, and cheque-status verification (Finacle/SVS) directly into the ECC/NCHL cheque-clearing workflow. Authored the client-ready Solution Architecture & High-Level Design (HLD) covering DC/DR and security considerations, defined the Module I/II scope boundary, routed all core-banking access through an approved integration layer instead of direct database access, and led the security assessment against the vendor security checklist.

    Verification embedded in the clearing workflow

    • Frappe
    • Solution Architecture
    • Finacle
    • Security Assessment

  3. Own technical proposals for prospective clients (designing the solution architecture, allocating team members, and making costing decisions), including multi-million NPR banking RFP responses (technical, compliance, and financial) featuring a multilingual AI chatbot architecture (.NET + Python FastAPI).

    Multi-million NPR enterprise tenders

    • .NET
    • Python
    • FastAPI

  4. Took over technical ownership of the Loan Management System for Bhutan's National Pension and Provident Fund: a Frappe (Python) middleware platform spanning digital lending, loan origination, servicing, and collections/litigation, integrated with Finacle CBS, Newgen DMS, the Credit Information Bureau, National Digital Identity, the Pension & PF system, and bank payment gateways.

    Replaces the legacy Kastle LOS

    • Frappe
    • Python
    • Finacle CBS
    • Newgen DMS

  5. Built the Loan Management System integration layer for Veni, a banking & insurance product: a Python FastAPI gateway unifying Frappe, NewGen DMS (OmniDocs), and downstream banking services behind a single interface for AI-integrated document workflows.

    3 disparate systems unified behind one API

    • Python
    • FastAPI
    • API Gateway
    • Frappe
    • NewGen DMS

  6. Optimized multiple critical APIs from ~24s response times down to milliseconds, scaling capacity from 500 concurrent users across multiple pods to 2,500+ users on a single pod.

    5x throughput, reduced infrastructure

    • ASP.NET Core
    • PostgreSQL
    • AWS
    • Performance Tuning

  7. Backend engineer on a global EdTech platform deployed in Indonesia and international markets, adopted across all Ing Group colleges, built on ASP.NET Core, PostgreSQL, and AWS.

    Deployed across international markets

    • ASP.NET Core
    • PostgreSQL
    • AWS

  8. Migrated 5+ AWS Lambda functions from Node.js to .NET to share a common data access layer with the core platform, eliminating schema drift and the recurring production issues it caused in legacy modules.

    Schema drift eliminated

    • AWS Lambda
    • .NET Core
    • Node.js
    • C#

Where I've built things that matter

Aug 2026 - Present

Lead Software Engineer

CAS Total Solutions
Kathmandu, Nepal
  • Architected the Signature Middleware for Nepal SBI Bank on Frappe, embedding account, balance, signature, and cheque-status verification (Finacle/SVS) directly into the ECC/NCHL cheque-clearing workflow, removing the need for clearing users to check core banking separately. Authored the client-ready Solution Architecture & HLD covering DC/DR and security considerations; defined the Module I/II scope boundary and routed all CBS access through an approved integration layer instead of direct database access.
  • Led the security assessment of the SBI Signature Middleware against the vendor security checklist, defining scope and responsibility boundaries.
  • Took over technical ownership of the Loan Management System for Bhutan's National Pension and Provident Fund (NPPF): a Frappe (Python) middleware platform spanning digital lending, loan origination, servicing, and collections/litigation, integrated with Finacle CBS, Newgen DMS, the Credit Information Bureau, National Digital Identity, the Pension & PF system, and bank payment gateways.
  • Built the Loan Management System integration layer for Veni, a banking & insurance product: a Python FastAPI gateway unifying Frappe, NewGen DMS (OmniDocs), and downstream banking services behind a single interface for AI-integrated document workflows.
Oct 2025 - Present

Senior Software Engineer (Tech Lead)

CAS Techno Sales (Frost Digital Ventures)
Kathmandu, Nepal
  • Architected "7 Gates" for Frost & Sullivan: 7 application services plus AWS Lambda workers behind a centralized OpenIddict AuthServer (OAuth2/OIDC), delivering SSO across 6 products; launched enterprise-wide to the client's global workforce.
  • Planning and executing the AWS-to-Azure migration of Frost & Sullivan's platforms (MyClient, 7 Gates, AI Growth Coach) as a phased 8-week programme, with board-ready migration plans and Gantt timelines.
  • Own technical proposals for prospective clients (designing the solution architecture, allocating team members, and making costing decisions), including multi-million NPR banking RFP responses (technical, compliance, and financial) featuring a multilingual AI chatbot architecture (.NET + Python FastAPI).
  • Re-architected a lab-stage AI prototype into production microservices: async AI job orchestration via AWS SQS with dedicated Lambda workers for compute-heavy document processing, eliminating out-of-memory failures, enabling EC2 right-sizing, and cutting infrastructure cost.
  • Defined the enterprise-readiness roadmap for Navi, an in-house workflow automation platform (security, multi-tenancy, and commercialization strategy), presented to executive leadership.
  • Lead technical decision-making for a 5-person engineering team and serve as the sole technical representative on client and executive calls, reviewing BRDs and presenting feasibility assessments and delivery timelines directly to the board.
Sep 2024 - Present

Final Year Project Supervisor (Part-time)

Islington College
Kathmandu, Nepal
  • Supervise final-year students through full project lifecycles (scoping, stack selection, and delivery) with structured feedback on documentation, implementation quality, and non-functional requirements.
Feb 2022 - Aug 2025

Senior Software Engineer

Innovate Tech Pvt. Ltd.
Kathmandu, Nepal
  • Cut critical API response times from ~24s to milliseconds, scaling capacity 5x: from 500 concurrent users across multiple pods to 2,500+ users on a single pod with reduced infrastructure.
  • Reduced average query execution time by 30% through LINQ optimization, query-plan analysis, and targeted PostgreSQL indexing.
  • Migrated 5+ AWS Lambda functions from Node.js to .NET to share a common data access layer with the core platform, eliminating schema drift and the recurring production issues it caused in legacy modules.
  • Significantly reduced storage costs by building ETL and archival pipelines across DynamoDB, PostgreSQL, and S3 (Parquet serialization with lifecycle policies to Glacier), plus Python-based data migration pipelines.
  • Delivered backend services for My Second Teacher (a global EdTech platform deployed in Indonesia and international markets and adopted across all Ing Group colleges) and Home School Asia, on ASP.NET Core, PostgreSQL, and AWS.
  • Mentored junior engineers and interns through a self-designed onboarding curriculum (C#, ASP.NET Core, PostgreSQL) and regular code reviews.
Nov 2019 - Feb 2022

Software Engineer

Percoid IT Solution
Kathmandu, Nepal
  • Delivered full-stack client systems on ASP.NET Core MVC, Web APIs, AngularJS, and SQL Server, including a Billboard Management System for outdoor advertising operations.
  • Optimized high-volume SQL queries and stored procedures and resolved production issues across concurrent client engagements.
Sep 2018 - Oct 2019

Earlier Roles

Insight Workshop (Trainee, 2019) · Braindigit (Intern, 2018-19)
Kathmandu, Nepal
  • Built a real-time chat application (SignalR), a serverless email service (Azure Functions), and backend modules for a School Bus Management System (ASP.NET Core, SQL Server)

Academic foundation

2021 - 2024

MSc Information Technology & Applied Security

London Metropolitan University
Islington College, Kathmandu
Merit, 66.44%
2016 - 2019

BSc (Hons) Computing

London Metropolitan University
Islington College, Kathmandu
First Class Honours, 73.11%

Certified & validated

Mar 2026

AWS Certified Solutions Architect - Associate (SAA-C03)

Amazon Web Services
Active

Have a project in mind?
Let's talk.

I'm open to discussing new opportunities, collaborations, or just chatting about backend architecture, AI and cloud systems.

Email rozeennakarmi5@gmail.com Phone +977-9860028647 LinkedIn LinkedIn GitHub GitHub Website rozeen.com.np