N.Kouis ▲ since 2022

Nikolas
Kouis

Backend engineer in Limassol. I build products that move real money: a trading app, a broker CRM and my own pet-care marketplace. Mostly .NET, shipped to real users.

Email me See positions

Open positions

Where I'm putting my time right now. Tap a row to expand.

INGOTINGOT Brokers, TradeRise Software Engineer, gamification and payments 2025 Open

TradeRise is INGOT Group's new trading app, live since August 2026 across the Middle East and Latin America. I'm on the team that runs its payments and trading, and I build the gamification platform.

50K+
App downloads
97.5%
Payment success rate
21,900+
Clients migrated in one release
1,000+
Tradable instruments
built by me

AI QA agent

One UI that runs the whole quality loop for the team. It controls the GitHub workflows, reads the SonarQube quality gates, has Claude review every pull request, runs and checks the Maestro mobile automation tests, and watches Sentry and Grafana after a release. Unit tests per project, smoke and regression suites and GitHub push rules are all managed from the same place.

  • GitHub Actions
  • ▸
  • SonarQube
  • ▸
  • Claude review
  • ▸
  • Maestro tests
  • ▸
  • Sentry + Grafana
  • =
  • 1 UI

  • Gamification platform

    Reward engine, anti-abuse system, user profiles and an admin hub to run it all.

  • Payments

    Built the deposit and withdrawal flows, part of a payment stack across 7 providers where each one runs in its own isolated workflow.

  • Broker CRM

    .NET 9/10 microservices over REST, GraphQL, gRPC, WebSockets and SignalR, including cryptography and AWS S3 sync.

  • Workflows

    Elsa Workflows behind client onboarding approvals and other business-critical processes.

  • Referrals and affiliates

    Referral and affiliate systems for the platform, built into the CRM and tracked end to end.

  • Infra and observability

    Kafka, Redis, MongoDB, PostgreSQL, Kubernetes, Argo and Vault, monitored with OpenTelemetry, Prometheus and Grafana.

Visit traderise.com
PETSLYPetsly Co-founder, software engineer 2025 Open

A pet-care marketplace connecting owners with verified sitters and pet businesses, used in 24 countries with Cyprus and Greece as the biggest markets. Co-founded with Theodoros Herodotou. It's just the two of us: architecture, payments, store releases, marketing and the support inbox.

2,280+
Registered users
680+
Registered sitters
4.99/5
Average rating, 110+ reviews
24
Countries with users
€9,600+
Processed through Stripe
230+
Bookings
45%
Bookings from repeat customers
95%+
Payment success rate

  • Three platforms, one codebase

    iOS, Android and web from React Native and Expo, on .NET, PostgreSQL and Redis, with CI/CD and over-the-air updates.

  • Payments

    Stripe Connect with manual capture: owners are only charged once the sitter accepts. Payouts, refunds, disputes, Apple Pay and Google Pay.

  • Bookings

    Booking engine rewritten three times until it was right. Quotes with price revisions for custom services like pet taxi.

  • Real time

    SignalR chat with photo sharing (9,000+ messages), live GPS walk tracking and push notifications.

  • Trust and admin

    KYC with admin review and a full admin CRM: users, bookings, payments, vouchers, referrals and campaigns.

  • Ecosystem

    8 languages, a live in-app partner shop, 500+ pet businesses, 24 emergency vet clinics and 15 pet-food brands.

Visit petsly.pet

Closed positions

Earlier roles, all of them shipped.

ODYSOdyssey Cybersecurity Software Developer 2025 Closed

Secure backend APIs and backend architecture in .NET Framework and .NET Core, with MSSQL and Entity Framework.

AMDOCSAmdocs, Vubiquity Software Developer 2023-25 Closed

Built the Virgin Media client portal (C#, .NET, React, Azure AD B2C sign-in) and an internal CRM on serverless REST APIs with Azure Functions. Azure DevOps pipelines throughout.

FREEFreelance Web and booking systems Side work Shipped

A booking system for a hair salon (appointments, staff and client scheduling) and the website for Olympos Dry Cleaning, a family-run Limassol business.

VRUniversity of Essex, Frontrunners VR Developer 2023 Closed

A VR avatar creator for children, part of the "Be Yourself" project, built in Unity for Oculus.

AMDOCSAmdocs, Vubiquity Software Developer Intern 2022 Closed

Admin interface features in React and .NET, across front end and back end.

Stack

What I reach for, grouped by layer.

Backend

  • C#, .NET 9
  • ASP.NET Core
  • Entity Framework
  • REST, GraphQL, gRPC
  • SignalR, WebSockets
  • Kafka
  • Elsa Workflows

Frontend and mobile

  • React
  • React Native, Expo
  • TypeScript
  • Material UI
  • MAUI

Data

  • PostgreSQL
  • Supabase
  • MySQL, MSSQL
  • MongoDB
  • Redis

Cloud

  • Azure Functions
  • Azure AD B2C
  • Azure DevOps
  • AWS S3
  • Railway
  • Kubernetes

Payments

  • Stripe Connect
  • Apple Pay, Google Pay
  • Deposits, withdrawals
  • KYC, 3-D Secure
  • Refunds, disputes

Ops and observability

  • Argo, Vault
  • OpenTelemetry
  • Prometheus, Grafana
  • Sentry, PostHog

Testing

  • xUnit, Jest
  • Maestro
  • SonarQube
  • GitHub Actions
  • Claude PR review
  • Smoke and regression

Games and XR

  • Unity
  • Unreal Engine
  • Oculus VR

Wins

Hackathons, jams, a game on the store and certifications.

1st

CSEE Society Hackathon

2023, 2D Unity game

1st

Essex Game Dev Society Game Jam

2022, first-person Unity game

2nd

Amdocs Hackathon

2022, web-based Unity game

Final

Immerse UK

2023, VR capstone project

▲

Published Android puzzle game

Built and shipped to Google Play

CCNA

Cisco CCNA

Networking certification

BSc

Computer Science

University of Essex, 2020 to 2023

Let's talk.

Roles, projects, or just to say hi.

kouis16cy@gmail.com +357 99 920132