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orestklymko

Orest K.

@orestklymko

Senior full stack engineer, web apps, backends and payments

Slowakei
Englisch, Ukrainisch, Russisch, Slowakisch
Einige Informationen werden in englischer Sprache angezeigt.
Über mich
Senior full-stack engineer, 5+ years. I take products from idea to launch: web apps, backends, payments and mobile apps. I co-founded MMA Finds and built it as the only engineer: a marketplace with Stripe, App Store and Google Play payments, live on iOS and Android. I built Velora, an ad analytics product with a WordPress plugin, and multilingual company websites. I lead the architecture of an enterprise data platform and built backend services for Austria's largest banking group. Stack: Kotlin, Java, Spring Boot, PostgreSQL, Kafka, React, Next.js. One engineer, from design to deployment.... Mehr lesen

Kompetenzen

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orestklymko
Orest K.
offline • 

Meine Dienstleistungen

API & Integrationen
I will integrate stripe, app store and google play payments in your spring boot backend
Ab250 $ / ProjektWeitere Details
API & Integrationen
I will build or fix kafka event processing in your spring boot or kotlin backend
Ab200 $ / ProjektWeitere Details

Portfolio

Arbeitserfahrung

DATALAN

Software Architect and Tech Lead

DATALAN

May 2026 - Present • 4 mos

Own the end-to-end architecture of an enterprise data pipeline platform: Apache NiFi, Kafka, RabbitMQ, MongoDB, PostgreSQL and Spring Boot services on Kubernetes. Turn business requirements into service boundaries, data flows and integration contracts, then implement the critical paths. GitOps deployments with ArgoCD. Built the observability stack from zero (OpenTelemetry, Grafana, Tempo, Loki, Prometheus). Wrote the team's API standards and run architecture reviews.

MMA_Finds

Co-Founder and Software Architect

MMA Finds • Selbstständig

Dec 2024 - Present • 1 yr 9 mos

Co-founder and the only engineer of MMA Finds, a two-sided marketplace for the MMA industry, live on iOS and Android. Core backend on Java 21, Spring Boot 3 and PostgreSQL, with a separate notification service. Payments and credits run through a ledger with idempotency keys: Stripe plus App Store and Google Play in-app purchases. Kafka for push and email notifications with a dead-letter topic. Login and roles with Keycloak (OIDC, JWT). React Native apps for iOS and Android. Docker behind Nginx, Prometheus metrics and Loki logs.

Erste_Digital

Software Engineer

Erste Digital • Vollzeit

Jan 2025 - Apr 2026 • 1 yr 3 mos

Erste Group, Austria's largest banking group (15M+ customers). Owned projects end to end in a 10+ microservice system: requirements, architecture, implementation, production. Designed REST APIs and integrations with external and third-party systems (Java 17/21, Spring Boot). Led architecture design reviews in the backend team. Introduced blue-green zero-downtime releases and optimized CI/CD pipelines on OpenShift.