YELLOW — ABOUT

ARIUNBOLD

BACKEND
SOFTWARE ENGINEER.

Building scalable payment systems and cloud-native backends, one commit at a time.

Brisbane, QLD, Australia

5+Years Exp

1.4M+Users Served

50K+Daily Txns

BLUE — SKILLS

TECHSTACK.

“Every tile in place.”

Node.js

92%

TypeScript

88%

MongoDB

88%

GraphQL

85%

REST API

92%

Express

88%

NestJS

82%

Microsvcs

85%

JavaScript

90%

MONGOLIANNATIVE

ENGLISHIELTS 7.0

RED — CAREER

WORKEXPERIENCE.

“Four roles. Three companies. One craft.”

01[ LAYER 1 — FOUNDATION ]

Erxes Inc

Fullstack Developer

2021 — 2023

Customer experience and marketing automation platform. Backend services, frontend migration, and AWS infrastructure.

▸Developed and maintained backend services using Node.js and MongoDB
▸Implemented new features and fixed production issues across the platform
▸Improved reporting and export functionalities with advanced multi-filter export
▸Resolved integration issues involving Facebook Messenger and third-party services
▸Migrated frontend applications to Cloudflare Pages and optimized deployment pipelines
▸Managed AWS S3 and SES services and created technical documentation

Node.jsMongoDBReactGraphQLAWS S3AWS SESCloudflare

XP GAINED78/100

02[ LAYER 2 — EXPANSION ]

Playmo

Backend Software Engineer

2023 — 2023

Video streaming and digital content platform serving users across Mongolia.

▸Developed REST APIs and backend services supporting content delivery and user management
▸Built subscription and platform operations services for a growing user base
▸Improved system reliability with structured error handling, validation, and logging
▸Optimized database queries and backend workflows for improved response times
▸Contributed to deployment and release processes for stable production environments

Node.jsMongoDBREST APIExpressJavaScript

XP GAINED82/100

03[ LAYER 3 — MODERNIZATION ]

Mezorn

Software Engineer

2023-2026

Participated in platform modernization by migrating legacy PHP services to scalable NestJS architecture.

▸Refactored and redesigned backend modules to improve maintainability and performance
▸Developed REST APIs supporting content delivery, user management, and subscriptions
▸Introduced structured error handling, validation, logging, and monitoring practices
▸Collaborated with cross-functional teams for seamless migration with minimal disruption
▸Optimized database queries and backend workflows for improved application performance

NestJSNode.jsTypeScriptMongoDBREST API

XP GAINED86/100

04[ LAYER 4 — MASTERY ]

Mezorn

Software Engineer — Payments

2023 — 2026

Lead backend development of mission-critical payment services for one of Mongolia's largest ride-hailing platforms, serving 1.4M+ users and 100K+ drivers.

▸Owned end-to-end payment ecosystem supporting 50,000+ daily transactions across passenger payments, wallet top-ups, driver payouts, refunds, and loyalty programs
▸Integrated and maintained connections with major payment providers and digital banking platforms in Mongolia
▸Architected scalable microservices using Node.js, TypeScript, MongoDB, AWS Lambda, and Serverless Framework
▸Designed event-driven workflows using AWS SNS for real-time payment and notification systems
▸Implemented observability and monitoring with AWS CloudWatch, reducing incident response time
▸Collaborated with product, finance, mobile, and frontend teams on business-critical payment features

Node.jsTypeScriptMongoDBAWS LambdaAWS SNSAWS CloudWatchServerlessGraphQL

XP GAINED95/100

ORANGE — PROJECTS

SHIPPED
PROJECTS.

“Production systems. Real impact.”

6Production
Projects

GREEN — EDUCATION

KNOWLEDGEBASE.

“The foundation was solid before the first commit.”

TIMELINE

2006

SCHOOL STARTSSchool No. 97

2017

UNIVERSITYNational University of Mongolia

2021

FIRST DEV JOBErxes Inc — Fullstack

2022

GRADUATEDBachelor of IT

2023

MEZORNPayment systems at scale

NOW

BRISBANEBrisbane, QLD, Australia

[ LAYER 2 — FOUNDATION ]2017 — 2022

National University of Mongolia

Bachelor of Information Technology — Information Technology

▸ Algorithms, software engineering, and the first lines of real code.

[ LAYER 1 — ORIGIN ]2006 — 2017

School No. 97

Full Secondary Education

▸ Where the curiosity began.

[ LAYER 3 — MASTERY ]2021 — Present

Continuous Learning

Certifications & Growth

▸ AWS SAA-C03 (In Progress)
▸ AWS DVA-C02 (In Progress)
▸ Serverless Architecture
▸ System Architecture
▸ Payment Systems Design

LANGUAGES

MONGOLIANNATIVE

ENGLISHIELTS 7.0

Mongolian native · English IELTS 7.0

PERSONAL — PLAYER STATS

THE HUMAN
BEHIND THE CODE.

“Same brain. Different puzzles.”

RUBIK'S CUBE

Record Holder

Mongolian Rubik's Cube record holder. The same satisfaction as fixing a production bug — but faster.

MARATHON

42km Runner

Marathon runner. Debugging sessions are easier when your legs are already tired.

LEARNING

Always Growing

Passionate about continuous learning and technology. Currently preparing AWS certifications.

BRISBANE

Based in QLD

Building a career in Australia while bringing global production experience to every challenge.

FINTECH

50K+ Daily Txns

Proven track record delivering reliable, business-critical payment systems at scale.

SERVERLESS

AWS Native

Architecting event-driven microservices with Lambda, SNS, and CloudWatch.

WHITE — CONTACT

LET'S SOLVESOMETHING.

“The cube is solved. The next challenge is yours to set.”

Backend Software Engineer with 5+ years of experience building scalable cloud-native applications and payment systems. Experienced in designing and maintaining high-traffic backend services supporting over 1.4 million users and 50,000+ daily transactions. Strong expertise in Node.js, TypeScript, AWS Serverless, MongoDB, GraphQL, and microservice architectures.

EMAILAriukarbk@gmail.com

LOCATIONBrisbane, QLD, Australia

OPEN TOOpen to new opportunities

● AVAILABLE

CUBE SOLVED

Ready to hire a developer who treats every engineering challenge like a puzzle worth solving?

SEND AN EMAIL →VIEW GITHUB

ARIUNBOLD

BACKEND
SOFTWARE ENGINEER.

TECHSTACK.