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Full-Stack Engineer at XK Group

Hello,I'm Robert Nikolla.

Full-stack engineer working on a US telehealth platform and two direct-to-consumer health brands: billing, fulfillment, partner integrations and conversion funnels.

Get in touchGitHubLinkedIn

Shipping with 26 tools across the stack

  • JavaScript
  • TypeScript
  • React
  • Next.js
  • Tailwind CSS
  • Node.js
  • NestJS
  • Express.js
  • Laravel
  • PHP
  • Prisma
  • PostgreSQL
  • MySQL
  • Microservices
  • REST APIs
  • Webhooks
  • Stripe
  • Shopify
  • Shopify Flow
  • WooCommerce
  • WordPress
  • Meta Conversions API
  • Git
  • Docker
  • Railway
  • Claude Code

[ 01 / 05 ]·About

About

Building dependable web products.

Telehealth and e-commerce systems, in production.

Robert Nikolla
Robert NikollaXK Group

Profile

Robert Nikolla. Full-stack engineer at XK Group since March 2023. I work directly with the founders and non-technical stakeholders, turning business requirements into production systems.

I build core services for a HIPAA-compliant US telehealth platform, and I'm the sole engineer on two direct-to-consumer health brands, which I built from scratch.

I use Claude Code day to day. I write the specs and review the changes.

Role
Full-Stack Engineer
Company
XK Group
Since
March 2023
Focus
Telehealth · Commerce · Billing
Workflow
Claude Code

Experience

Mar 2023 – Present · Remote

Full-Stack Engineer at XK Group

I work directly with the founders and non-technical stakeholders, turning business requirements into production systems across three brands.

Omzo

US telehealth

  • Core services: subscription billing, medication shipment and a telehealth partner integration.

Bala Health

US supplements

  • Sole engineer: Next.js storefront on Shopify, Stripe billing and conversion funnels.

Bala Nutritions

South Eastern Europe

  • Sole engineer: WooCommerce store, custom plugins for billing, sales-agent and fulfillment workflows, and affiliate payouts.

Education

  • University of Business and Technology

    BSc in Computer Science and Engineering · Oct 2021 – Present

  • Digital School

    Full-Stack Development Program · 2019 – Apr 2022

  1. React Native Development · Certificate
  2. Java Development · Certificate
  3. Back-End Development · Certificate
  4. Front-End Development · Certificate

[ 02 / 05 ]·Skills

Skills

Tech stack and everyday tooling.

The languages, frameworks, and platforms I reach for across frontend, backend, and commerce, plus how I work with coding agents.

01Frontend

05 items

  • JavaScript
  • TypeScript
  • React
  • Next.js
  • Tailwind CSS

02Backend

11 items

  • Node.js
  • NestJS
  • Express.js
  • Laravel
  • PHP
  • Prisma
  • PostgreSQL
  • MySQL
  • Microservices
  • REST APIs
  • Webhooks

03Payments & commerce

06 items

  • Stripe
  • Shopify
  • Shopify Flow
  • WooCommerce
  • WordPress
  • Meta Conversions API

04Tooling

03 items

  • Git
  • Docker
  • Railway

05Domains

05 items

  • Telehealth integrations
  • Subscription billing
  • Order & shipment pipelines
  • Conversion funnels
  • Marketing automation

06Agentic engineering

I use Claude Code day to day. I write the specs and review every change.

  • Claude Code

[ 03 / 05 ]·Work

Selected work

Selected work.

Three live products I build and maintain at XK Group.

01Case study

Full-stack engineer

Omzo

US telehealth platform.

US telehealthHIPAA-compliant
  • Built NestJS microservices designed to HIPAA requirements for patient health data.
  • Designed and built the subscription billing engine, including prepaid fixed-quantity plans.
  • Built the medication shipment engine that moves orders from prescription to pharmacy fulfillment.
  • Owned the integration with one of the platform's two telehealth partners, and connected platform events to marketing workflows.
NestJSNext.jsTypeScript
Visit live site (omzo.com)Discuss this build

02Case study

Sole engineer

Bala Health

US gut-health supplement brand.

US DTC
  • Built the store from 0 to 1: a custom Next.js storefront integrated with Shopify.
  • Built custom Stripe billing engines, including management of multiple subscriptions per customer.
  • Implemented end-to-end conversion tracking with server-side Meta Conversions API events, so ad platforms optimize on reliable purchase data.
  • Built quiz-based funnels and parallel checkout flows for testing, and integrated third-party affiliate services.
Next.jsShopifyStripeMeta Conversions API
Visit live site (bala.health)Discuss this build

03Case study

Sole engineer

Bala Nutritions

Supplement retailer serving South Eastern Europe.

South Eastern Europe e-commerce
  • Built the WooCommerce store and marketing funnels from 0 to 1, extending the theme to match the designs.
  • Built and own the custom WooCommerce plugins behind billing, sales-agent and fulfillment workflows, including order logging, removing manual work for sales agents and fulfillment staff.
  • Built the affiliate system for influencer partnerships, including the payout workflows.
  • Migrated the store to Railway, including the webhook cutover, email delivery and scheduled jobs.
WooCommerceWordPressPHPCustom pluginsRailway
Visit live site (balanutritions.com)Discuss this build

[ 04 / 05 ]·Projects

Side projects

Additional builds and experiments.

[ 05 / 05 ]·Contact

Contact

Let's build something meaningful.

I'm based in Pristina, Kosovo (CET) and open to remote roles, full-time or contract. Feel free to get in touch.

Email me
Email[email protected]GitHubgithub.com/robnikollaLinkedInlinkedin.com/in/robnikolla