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Nikola Miljkovic

@nikolamiljkovic

Senior Full Stack Engineer at Atendo, building an AI attendance assistant for a B2B SaaS used by 8 paying clients.

Atendo is the B2B SaaS product I co-founded, where I designed and built an employee attendance and shift management platform spanning an API, admin web app, mobile app, and NFC kiosk tablets. I took the product from zero to 8 paying clients and built an AI assistant that lets managers query attendance data in natural language.

At Riverside Insights, I’m leading the migration of an e-commerce platform from BigCommerce to an in-house system integrated with NetSuite, HubSpot, and Snowflake. I’m building its React client and backend services in .NET, Node.js, and Python.

At Ethernal, I architected an NFT marketplace on Solana and built services to keep application data in sync with on-chain contracts. I also redesigned PostgreSQL views and indexing for transaction-heavy queries.

Earlier, I worked on the InSITE geospatial platform at NV5 Geospatial, building React map features with Leaflet and Mapbox, and at Nutanix, building and maintaining internal full-stack tools. My experience also includes setting technical strategy as CTO at Kiterra LLC and building custom CMS, CRM, and e-commerce platforms for Swiss and Serbian clients.

Experience

Work history, roles, and key accomplishments

Current

Co-founder & Senior Full Stack Engineer

Current

Atendo

Nov 2025 - Present (1 year)

Designed and built a multi-tenant SaaS for employee attendance and shift management end-to-end, including API, admin web app, mobile app, and NFC kiosk tablets. Implemented NFC, BLE, and QR check-in flows and an AI assistant integrated with OpenAI, taking the product from zero to 8 paying clients.

React NodeJS TypeScript AWS NFC BLE QR決済 OpenAI Multi tenant SaaS Architecture Infrastructure Releases

Senior Full Stack Engineer

Riverside Insights

Dec 2024 - Oct 2026 (1 year 10 months)

Leading migration of the e-commerce platform from BigCommerce to an in-house system integrated with NetSuite, HubSpot, and Snowflake. Building the new React client and backend services in .NET (C#), Node.js, and Python on MSSQL, deploying serverless services on AWS.

React .NET C#NodeJS Python MSSQL AWS Lambda API Gateway RDS Amazon SQS BigCommerce NetSuite HubSpot Snowflake

Senior Full Stack Engineer & System Architect

Ethernal

Jan 2023 - Jul 2025 (2 years 6 months)

Architected an NFT marketplace on Solana with a React + Node.js (TypeScript) stack. Redesigned PostgreSQL views and indexing for transaction-heavy queries, built sync services with RabbitMQ, Redis, and WebSockets, and set up CI/CD with GitHub Actions and the EC2 production stack.

React NodeJS TypeScript Solana PostgreSQL RabbitMQ Redis WebSockets GitHub Actions EC2 Nginx CI CD Mentorship

Senior Full Stack Engineer

NV5 Geospatial

Aug 2021 - May 2024 (2 years 9 months)

Core engineer on the InSITE geospatial platform, building API in Elixir and Rust over PostgreSQL and background services in Python on AWS. Built React/Redux map features with Leaflet and Mapbox and covered frontend with Jest and React Testing Library to match 80-90% coverage.

Elixir Rust PostgreSQL Python AWS S3 Lambda Amazon SQS React Redux Leaflet Mapbox Jest React Testing Library

Senior Full Stack Engineer

Nutanix

Jan 2019 - May 2021 (2 years 4 months)

Built and maintained internal full stack tools with React, Node.js, and Python. Optimized data storage and search across PostgreSQL, MongoDB, and Elasticsearch to improve response times and app smoothness for admins monitoring VM processes.

React NodeJS Python PostgreSQL MongoDB Elasticsearch Data Storage Search Optimization

CTO & Senior Full Stack Engineer

Kiterra LLC

Mar 2018 - Dec 2018 (9 months)

Set technical strategy, budget, and hiring for the iStory startup. Built the API (Node.js, MongoDB), React web app, and iOS backend on AWS (EC2, Beanstalk, SQS, SNS, S3).

NodeJS MongoDB React AWS EC2 Beanstalk Amazon SQS SNS S3 Technical Strategy Budgeting Hiring

Senior Full Stack Engineer

IM Republic

Feb 2017 - Mar 2018 (1 year 1 month)

Delivered client projects in Node.js, React, Python/Django, Laravel, and Ruby on Rails with PostgreSQL and MySQL.

NodeJS React Python Django Laravel Ruby on Rails PostgreSQL MySQL

Tech Lead / Senior Full Stack Engineer

Kiterra LLC

Nov 2012 - Feb 2017 (4 years 3 months)

Led a team of 4 developers and 2 designers on Rekordr, a journaling platform for web, iOS, and Android. Owned architecture, the Node.js/MongoDB API, Linux servers on AWS, and Google API integrations.

NodeJS MongoDB AWS Linux Google API Team Leadership Architecture

Software Developer

Aramedia Solutions AG

May 2003 - Jul 2012 (9 years 2 months)

Built custom CMS, CRM, and e-commerce platforms for Swiss and Serbian clients in PHP (Zend Framework), C#/.NET, MySQL, and MSSQL. Notable work includes a news portal for Aktuell.tv, a multi-role trading platform for a Serbian commodity exchange, and a flight search app for Air France/KLM Australia.