Ashim Regmi, Java software engineer. Most of what I build, you’ll never see.

Ten years of Java and Spring behind things that have to work: APIs for a fleet and contract platform used by Volvo, BMW and Daimler Truck, payments across 7+ gateways, and notifications that reach millions of people within minutes.

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years in Java engineering: 10
companies across Nepal, Poland & Japan: 6
payment gateways integrated: 7+
news sources aggregated every minute: 80+

System status — operational · 10 yrs uptime

How I build: Principles, with receipts.

Seven working principles, each footnoted with something I’ve actually shipped.

Architecture

Draw the boundaries first.

Most architecture is deciding what talks to what, and through which contract. Get the boundaries and the APIs right, and the framework underneath becomes a detail.1

ReceiptNo. 1

REST APIs for the contract, customer and invoicing modules of LEO System, a fleet and contract platform used by Volvo, BMW and Daimler Truck.
LEO System
Scalability

Design for the millionth user.

Scale isn’t a phase you reach; it’s a requirement you design in. Assume the audience is huge, the target keeps moving, and the deadline is measured in minutes.2

ReceiptNo. 2

An in-house notification service that reaches dynamic segments of millions of users within minutes.
Notification service
Performance

Treat time as a budget.

When a job runs every minute, every second of it has to be accounted for. Fast is a feature. Predictable is a better one.3

ReceiptNo. 3

A pipeline that gathers news from more than 80 portals every minute and publishes it to millions of readers.
News pipeline
Developer experience

Automate the road to production.

The fastest teams trust their pipeline. Build and release steps belong in code — versioned, reviewed and boring.4

ReceiptNo. 4

Bamboo Specs that automate CI/CD for NPM front-end projects and Java microservices.
Asseco Data Systems
Product thinking

Meet people where they already are.

Integrations are product work. The best checkout isn’t the one with the nicest API — it’s the one people already use.5

ReceiptNo. 5

Stripe, PayPal and Cybersource integrated alongside Nepal’s ConnectIPS, eSewa and Khalti for a consumer platform.
Payments
Maintainability

Leave it easier to change.

Legacy code earned its keep; it deserves a careful exit, not a heroic rewrite. Modernize in steps, keep it running, and make the next change cheaper.6

ReceiptNo. 6

Legacy Java EE modules (WildFly, JSF/RichFaces) modernized toward microservices, with Angular admin apps for licenses, users and workflows.
Asseco Data Systems
Leadership

Lead close to the code.

Leadership is mostly clarity — about goals, ownership and what “done” means. I practised it as an engineering manager, leading a cross-functional team at Hamro Patro.7

ReceiptNo. 7

Engineering Manager at Hamro Patro, leading a cross-functional team on Let’s Read Asia’s apps and tele-services calling — then back to hands-on backend work.
Career

Selected work: Four systems, made visible.

Backend work doesn’t screenshot well. So instead of screenshots: schematics — illustrations of what each system does, not exact architecture.

01 / 04

Fleet & contract management

LEO System

Backend services and APIs for an enterprise leasing platform used by Volvo, BMW and Daimler Truck.

Role: Java Developer
Company: Asseco Data Systems
Where: Poland
When: Oct 2022 – Dec 2025

Fig. 01 The work at Asseco, mapped: LEO System’s APIs, the microservices, the modernization and the tooling. Illustrative.

The system

LEO System is a fleet and contract management platform used by Volvo, BMW and Daimler Truck.

What I did

Delivered REST APIs for LEO System’s contract, customer and invoicing modules.
Tested with JUnit and integration tests.

Also at Asseco

Built and maintained backend microservices with Java, Spring Boot, Apache Camel and Hibernate/JPA, using RabbitMQ for asynchronous processing.
Modernized legacy Java EE modules (WildFly, JSF/RichFaces) toward microservices.
Built the Angular admin apps used to manage licenses, users and workflows.
Contributed Bamboo Specs to automate CI/CD for NPM front-ends and Java microservices.

Outcome

Shipped to production. The contract, customer and invoicing APIs went live inside a platform used by Volvo, BMW and Daimler Truck.

Java
Spring Boot
Apache Camel
Hibernate / JPA
RabbitMQ
Java EE / WildFly
JSF / RichFaces
Angular
JUnit
Bamboo

02 / 04

Payments

Gateway integration layer

One integration across global and Nepali payment gateways, for a consumer platform.

Fig. 02 One integration layer, six gateways. Illustrative.

6gateways behind one integration layer — 7+ integrated in total

Role: Senior Software Engineer
Company: Hamro Patro, Inc.
Where: Kathmandu
When: Mar 2019 – Oct 2021

The problem

A consumer platform needed to take payments through international providers and through Nepal’s own payment networks — each with its own API and flow.

What I did

Integrated Stripe, PayPal, ConnectIPS, Cybersource, eSewa and Khalti behind one unified integration layer.

The hard part

Six providers, six different APIs and flows — presented to the rest of the platform as one.

Outcome

Shipped to production. Six gateways, global and Nepali, behind one integration layer for a consumer platform.

Stripe
PayPal
Cybersource
ConnectIPS
eSewa
Khalti

03 / 04

Messaging at scale

Notification service

An in-house service that sends targeted email and mobile campaigns to dynamic segments of millions of users — within minutes.

Fig. 03 A campaign reaching a dynamic segment. Every run draws a new one.

Audience: Millions
Time to reach: Minutes
Targeting: Dynamic segments
Channels: Email + mobile

Role: Engineering Manager
Company: Hamro Patro, Inc.
When: Nov 2021 – Sep 2022

The problem

Send targeted email and mobile campaigns to dynamic segments of millions of users — and reach them within minutes.

What I did

Built an in-house notification service for targeted email and mobile campaigns, capable of reaching dynamic segments of millions of users within minutes.

The hard part

Targeting dynamic segments of millions of users, and still reaching them within minutes.

Outcome

Shipped to production. Targeted campaigns reaching dynamic segments of millions of users within minutes.

04 / 04

Content pipeline

News aggregation, rebuilt

A pipeline that gathers news from more than 80 portals every minute and publishes it to millions of readers.

Sources: 80+
Cycle: 60 s
Readers: Millions

Role: Senior Software Engineer
Company: Hamro Patro, Inc.
When: Mar 2019 – Oct 2021

0 s 15 30 45

80+ portals, every minute

Fig. 04 80 ticks for 80+ portals. The sweep takes exactly one real minute to go round — the same cycle as the pipeline.

The problem

A minute-by-minute pipeline across 80+ sources, publishing to millions of readers, had to be rebuilt for reliability at scale.

What I did

Revamped the pipeline that gathers news from more than 80 portals every minute and publishes it to millions of readers.

The hard part

Keeping a one-minute cycle across 80+ portals while publishing to millions of readers.

Outcome

Shipped to production. Rebuilt for reliability at scale — 80+ portals every minute, published to millions of readers.

More from the log

Smaller entries, same care.

2021–22 Let’s Read Asia Led the cross-functional team building its web and mobile apps, as Engineering Manager at Hamro Patro.
2019–22 Tele-services calling Built audio/video calling for tele-services, then led the team behind it.
2021–22 Bare-metal cloud Managed the company’s bare-metal cloud infrastructure on Proxmox.
2017–19 Google Cloud backends Java services on App Engine, backed by Cloud Datastore, alongside web apps in various JS frameworks.
2026 Writing on AI data foundations Two articles on Markdown and YAML as the plain-text backbone of AI workflows.
2013–17 Where it started Pixel-perfect responsive sites and small HTML5 games, then internships in banking and services.

Career: Ten years of uptime.

From intern to engineering manager — and back to hands-on backend work. Six companies, across Nepal, Poland and Japan.

Career status: operational

99.1% uptime across dated roles, since June 2017 (1 month between roles)

2013 to 2017: trainee and intern roles June 2017 to February 2019: Software Engineer, Hamro Patro March 2019 to October 2021: Senior Software Engineer, Hamro Patro November 2021 to September 2022: Engineering Manager, Hamro Patro October 2022 to December 2025: Java Developer, Asseco Data Systems January 2026: between roles February 2026 to now: Java Software Engineer, Media Fusion

Feb 2026 – Present Current

Media Fusion Co., Ltd.

Java Software Engineer Current

Kathmandu · remote for a Japan-based company

Backend systems in Java and Spring — continuing a decade-long focus. Also writing about the plain-text foundations of AI workflows.
- Java
- Spring
Oct 2022 – Dec 2025 3 yrs 3 mos

Asseco Data Systems

Java Developer

Poland

Built and maintained backend microservices, and delivered REST APIs for the contract, customer and invoicing modules of LEO System, a fleet and contract management platform used by Volvo, BMW and Daimler Truck. Modernized legacy Java EE modules toward microservices, built the Angular admin apps, and contributed Bamboo Specs to automate CI/CD.
Case study: LEO System
- Java
- Spring Boot
- Apache Camel
- Hibernate / JPA
- RabbitMQ
- Angular
- JUnit
- Bamboo
Jun 2017 – Sep 2022 5 yrs 4 mos
Hamro Patro, Inc.

Three roles, one company

Kathmandu
1. Engineering ManagerNov 2021 – Sep 2022
  
  Led a cross-functional team building Let’s Read Asia’s web and mobile apps and audio/video calling for tele-services. Built an in-house notification service reaching dynamic segments of millions of users within minutes. Managed the company’s bare-metal cloud infrastructure on Proxmox.
  Case study: Notification service
2. Senior Software EngineerMar 2019 – Oct 2021
  
  Integrated Stripe, PayPal, ConnectIPS, Cybersource, eSewa and Khalti as payment gateways. Built audio/video calling for tele-services. Revamped a pipeline gathering news from 80+ portals every minute for millions of readers.
  Payments News pipeline
3. Software EngineerJun 2017 – Feb 2019
  
  Backend services in Java on Google Cloud App Engine, backed by Google Cloud Datastore, alongside web apps built with various JS frameworks.
- Java
- Google App Engine
- Cloud Datastore
- Payment APIs
- Proxmox
- JUnit
2013 – 2017 Early career

Trainee & intern roles

Leapfrog Technology · Agricultural Development Bank Ltd. · Deerwalk Services

Started out building pixel-perfect responsive sites and small HTML5 games, then interned in banking and services environments before moving into professional Java development.
- HTML5
- Responsive web

Technical expertise: Depth, by domain.

Not a logo wall. What I work with, grouped by the problems it solves — and where it shipped.

01
Backend
- Java
- Spring / Spring Boot
- Hibernate / JPA
- Java EE / WildFly
- REST APIs
- Microservices
Shipped in: Media Fusion · Asseco (LEO System) · Hamro Patro

Ten years of Java — from App Engine services to Spring Boot microservices.
02
Integration & messaging
- Apache Camel
- RabbitMQ
- Stripe
- PayPal
- Cybersource
- ConnectIPS
- eSewa
- Khalti
Shipped in: Asseco (LEO System) · Hamro Patro (payments)

RabbitMQ for asynchronous processing; Camel routes; six gateways behind one integration layer, 7+ integrated in total.
03
Architecture
- Microservices
- Legacy modernization
- Asynchronous processing
- Multi-gateway integration
- High-frequency ingestion
- Segment fan-out
Shipped in: LEO System · Payments · News pipeline · Notifications
04
Frontend
- Angular
- JSF / RichFaces (legacy)
- JavaScript frameworks
- Responsive web
- HTML5 games
Shipped in: Asseco (admin apps) · Hamro Patro (web apps) · Early career
05
Cloud & infrastructure
- Google Cloud App Engine
- Proxmox (bare-metal)
- Docker
Shipped in: Hamro Patro · Docker Essentials certification

Managed the company’s bare-metal cloud infrastructure on Proxmox as Engineering Manager.
06
Data
- MySQL
- PostgreSQL
- MongoDB
- Elasticsearch
- Google Cloud Datastore
- Hibernate / JPA
Shipped in: Hamro Patro (Datastore) · Asseco (Hibernate / JPA)

Relational, document and search stores — MySQL and PostgreSQL, MongoDB, Elasticsearch — plus Google Cloud Datastore.
07
Testing & quality
- JUnit
- Unit tests
- Integration tests
Shipped in: TalkFun Japan · LEO System (Asseco) · Hamro Patro
08
Delivery & tooling
- Bamboo Specs (CI/CD as code)
- NPM
- Docker
- Claude Code
Shipped in: Bamboo Specs & NPM — Asseco · Docker — certified
09
AI-assisted engineering
- Markdown & YAML for AI workflows
- Claude Code
Shipped in: Published on note · 2026
10
Leadership
- Engineering management
- Cross-functional teams
- Infrastructure management
- Technical writing
Shipped in: Hamro Patro (Engineering Manager) · note (writing)

About: Hello from UTC+05:45.

I work from Kathmandu — on one of the world’s few time zones with a 45-minute offset.

I’m Ashim Regmi, a Java software engineer with a decade-long focus on backend systems: at Hamro Patro in Kathmandu, on systems serving millions of users; at Asseco Data Systems in Poland, including APIs for LEO System, an enterprise fleet and contract platform; and now, remotely, at Media Fusion, a company based in Japan.

It started with pixel-perfect responsive sites and small HTML5 games. Since then I’ve been an engineer, a senior engineer and an engineering manager — and gone back to hands-on backend work.

Lately I write about the plain-text foundations of AI workflows: why Markdown matters, and how YAML keeps AI workflows manageable.

Outside the day job I keep learning: a master’s in IT, earned alongside work, and certifications in IBM blockchain and Docker.

Kathmandu—:—UTC+05:45

Japan—:—JST · UTC+09:00

Based in: Kathmandu, Nepal
Working with: Media Fusion Co., Ltd. — Japan, remote
Languages: English — full professional
Nepali — native
Education: M.S., Information Technology Islington College Kathmandu · 2022–2024 B.Sc., Computer Science & IT Deerwalk Institute of Technology · 2012–2016
Certifications: IBM Blockchain Foundation Developer IBM Blockchain Essentials Docker Essentials: Extend Your Apps With Containers
Writing: なぜMarkdownがAI活用の基盤となるのか？ Why is Markdown the foundation for using AI? note · AIデータ基盤 2026 (opens in a new tab) YAMLを活用してAIワークフローを効率的に管理する方法 How to manage AI workflows efficiently with YAML note · AIデータ基盤 2026 (opens in a new tab)

Contact: Let’s build the part nobody sees.

Open to Java backend and platform engineering roles.

Email language-rut-arson@duck.com

It’s —:— in Kathmandu right now.

Ashim Regmi, Java software engineer. Most of what I build, you’ll never see.

Draw the boundaries first.

Design for the millionth user.

Treat time as a budget.

Automate the road to production.

Meet people where they already are.

Leave it easier to change.

Lead close to the code.

The system

What I did

Also at Asseco

Outcome

The problem

What I did

The hard part

Outcome

The problem

What I did

The hard part

Outcome

The problem

What I did

The hard part

Outcome

More from the log

Media Fusion Co., Ltd.

Asseco Data Systems

Hamro Patro, Inc.

Trainee & intern roles

Backend

Integration & messaging

Architecture

Frontend

Cloud & infrastructure

Data

Testing & quality

Delivery & tooling

AI-assisted engineering

Leadership

Contact: Let’s build the part nobody sees.