System Architect & Senior Full-Stack Engineer · Java/Kotlin, Spring Boot, TypeScript/Next.js, Cloud & AI-native systems
Aktualisiert am 04.08.2026
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 04.08.2026
Verfügbar zu: 100%
davon vor Ort: 100%
Software Architecture
Spring Boot
Java
Next.js
Angular
Kotlin
TypeScript
Python
FastAPI
Android Studio
Xcode
SWIFT
JavaScript
Persian
Muttersprache
English
FLUENT
Russian
FLUENT
Ukrainian
INTERMEDIATE
German
A2

Einsatzorte

Einsatzorte

Aachen (+150km)
Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

1 year 7 months
2025-01 - now

Solo practice designing, building, and shipping production systems

Founder & System Architect
Founder & System Architect
Solo practice designing, building, and shipping production systems end to end. Multi-project portfolio across social dance, commerce, AItooling, and custom client engagements, ~90 repositories and ~1 million lines of code.
  • DanceClub (flagship, danceclub.app), Multi-app production platform for social dance events. 11 Kotlin/Spring Boot microservicesspanning 67 Gradle modules with strict hexagonal boundaries (pub-dom, private-dom, dao, api, business, rest). 40 JPA entities, 574API endpoints, 59 Flyway migrations, 48 integration tests against real Postgres (no mocks). Three Next.js 16 frontends: discovery app(27 routes), organizer hub (11 routes), internal backstage (15 routes). 107,500+ LOC total. Shipped solo in 15 months, live in production.
  • PulseAI (pulseai.run), Multi-provider LLM orchestration engine: Claude, GPT-4, Gemini with automatic failover, streaming responsesend-to-end, and multi-tenant node execution. Powers DanceClub's automated event intake pipeline with headless browser dataextraction. Private beta, evolving into a public platform.
  • edvone.dev, Personal practice platform: 9 service pages, booking system (Google Calendar API with OAuth2 + timezone-aware slotgeneration), separate admin and client portals (OTP + password 2FA), co-founder pitch funnel with R2 attachment uploads, editorialmanifesto. Next.js 16 + Prisma + Neon Postgres + Resend transactional email.
  • Infrastructure: self-hosted across 5 Hetzner servers (Docker + Caddy reverse proxy + Cloudflare CDN + Cloudflare R2 object storage),full CI/CD via GitHub Actions (lint, type-check, test, build, deploy on every push), separated staging and production environments. ZeroVercel, zero AWS, zero cloud vendor lock-in.
  • Also: independent consulting, bespoke architecture reviews, AI workflow design ('Lead the Machine'), system audits, and soloarchitecture engagements for clients needing a second opinion or a production-ready rebuild.
on request
AAchen
2 years 10 months
2022-04 - 2025-01

Led architecture transformation and system modernization

Senior Software Engineer & System Architect
Senior Software Engineer & System Architect
Led architecture transformation and system modernization for a B2B SaaS company serving document processing and businessautomation workflows.
  • Led monolith-to-microservices decomposition: broke a Vaadin monolith into 12 independently deployable services, defining serviceboundaries, shared domain interfaces, migration sequencing
  • Designed multi-tenant data and identity architecture serving 50+ tenants: tenant isolation, centralized authorization, cross-tenantsecurity boundaries
  • Introduced and integrated an API Gateway: unified authentication, routing, cross-service security controls as single ingress layer
  • Architected the Optical Invoice Recognition (OIR) pipeline: YOLOv8 barcode detection, document parsing workflows, async jobprocessing, 90%+ detection accuracy across thousands of invoices
  • Built internal workflow tooling: configurable workflow editor and PDF toolkits for business process automation
  • Mentored a team of engineers on domain modeling, architectural decision-making, maintainable system patterns
  • Led cloud migration roadmap: deployment automation, containerization strategy, operational scalability
Gypsilon GmbH
AAchen
9 months
2021-06 - 2022-02

Architected and built a crypto-to-fiat transaction platform

Senior Software Engineer
Senior Software Engineer
Architected and built a crypto-to-fiat transaction platform from the ground up.
  • Defined domain boundaries, data flow, integration patterns with local exchange providers
  • Implemented core logic using hexagonal architecture for maintainability and independent domain evolution
  • Designed B2B and B2C interaction layers for unified business workflows across both market segments
  • Built end-to-end transaction pipelines: wallet operations, exchange orchestration, reconciliation flows
  • Mentored engineers on architecture reasoning and modular design practices
Logics7 Inc
5 months
2021-01 - 2021-05

Mobile Architecture

Software Engineer
Software Engineer
  • Defined mobile application architecture and guided end-to-end app development
  • Designed API integration patterns for stable app-to-backend communication
  • Delivered the initial Android MVP, establishing the product foundation
Digitex
8 months
2020-05 - 2020-12

Consulting & Systems

Software Engineer
Software Engineer
  • Provided technical consulting and engineering support across web and mobile applications for multiple clients
  • Analyzed and stabilized existing systems by resolving architecture, data flow, and integration issues
Upwork / Independent
1 year 4 months
2019-01 - 2020-04

Full-Stack Product Development

Founder
Founder
Built and launched web and mobile products as an independent founder.
  • Architected and built a web and mobile product platform from scratch: backend services, frontend UI, deployment workflows
  • Delivered two native mobile applications (iOS & Android) including product definition and release management
  • Owned full product lifecycle from scope to deployment
Appster
4 years
2015-01 - 2018-12

Built end-to-end web applications

Full-Stack Developer
Full-Stack Developer
  • Built end-to-end web applications for SMBs across multiple domains
  • Created custom CMS/CRM systems and internal workflow tools
  • Integrated payment systems and external APIs
  • Worked directly with clients on requirements, user flows, and delivery
Regus

Aus- und Weiterbildung

Aus- und Weiterbildung

2013 - 2018

Doctor of Medicine, MD

Bogomolets National Medical University, Kyiv, Ukraine


2012 - 2013

Russian Language and Literature

Diploma

Taras Shevchenko National University of Kyiv, Ukraine


2010 - 2011

English Literature

Diploma

American College of Dubai, UAE

Position

Position

  • Staff Engineer
  • Principal Engineer
  • Founding Engineer
  • Founding CTO
  • Entrepreneur in Residence (EIR)
  • Technical Lead
  • Fractional CTO

Kompetenzen

Kompetenzen

Top-Skills

Software Architecture Spring Boot Java Next.js Angular Kotlin TypeScript Python FastAPI Android Studio Xcode SWIFT JavaScript

Produkte / Standards / Erfahrungen / Methoden

Profile

System architect with 10+ years designing and shipping distributed systems across fintech, logistics, B2B SaaS, commerce, and AItooling. For the past two years my work has been AI-native: agents, MCP, and the tooling around them built into how systems getdesigned, written, and operated, not bolted on afterward. I run an independent practice from Aachen spanning roughly 90 repositoriesand a million lines of code, led by PLMHub (version control for models and agents), elvix (the identity platform my products authenticatethrough), and DanceClub (an 11-service platform live in production since 2025). Earlier, at Gypsilon GmbH, I led the decomposition of aVaadin monolith into 12 microservices with multi-tenant architecture for 50+ tenants, and mentored the team through the change. Kotlinand Spring on the backend, TypeScript on the front (Angular at Gypsilon, React and Next.js in my own products), self-hostedinfrastructure underneath. Comfortable owning any layer, happiest raising a team's bar. Medical training sharpened my analytical rigor and ability to operate under pressure. Icommitted fully to software architecture and product development.


TECHNICAL SKILLS

ARCHITECTURE & SYSTEM DESIGN

  • System Architecture (Web, Mobile, Cloud)
  • Distributed Systems
  • Domain Modeling (DDD)
  • Hexagonal Architecture
  • Event-Driven Systems
  • Microservices
  • API Gateway Design
  • Multi-tenant Architecture
  • Scalability & Availability Trade-offs


LLM & AI ENGINEERING

  • Multi-provider LLM orchestration (Claude, GPT-4, Gemini)
  • MCP (Model Context Protocol) servers
  • Agent workflow design
  • Context engineering & correction protocols
  • Streaming + failover patterns
  • Multi-tenant context isolation
  • Production-scale prompt engineering
  • AI-assisted development (Claude Code, Codex, Cursor)


TESTING & QUALITY

  • Testcontainers (real DB, no mocks)
  • JUnit 5
  • Mockito
  • AssertJ
  • Vitest
  • Playwright (E2E)
  • Biome
  • knip
  • detekt
  • ktlin


OBSERVABILITY

  • Prometheus
  • Grafana
  • Loki
  • Alertmanager
  • Blackbox probes
  • SLO & alert design


LANGUAGES & FRAMEWORKS

  • Kotlin
  • Java
  • TypeScript
  • JavaScript
  • Python
  • Swift
  • Dart
  • Spring Boot 3.5
  • Spring Security
  • FastAPI
  • Bun
  • Next.js 16 (App Router, RSC)
  • React 19
  • Angular
  • Tailwind CSS 4
  • Prisma ORM
  • Framer Motion
  • Zod
  • next-intl
  • Radix UI
  • shadcn/ui
  • Flutter


CLOUD & INFRASTRUCTURE

  • Hetzner
  • AWS (EC2, S3, IAM)
  • GCP
  • Docker
  • Docker Compose
  • Kubernetes (k3s)
  • ingress-nginx
  • Caddy (reverse proxy + auto-SSL)
  • Cloudflare (CDN, DNS, Workers)
  • Cloudflare R2 (S3-compatible object storage)
  • Neon Postgres (managed)
  • Terraform
  • Fly. io
  • GitHub Actions
  • GitLab CI
  • ArgoCD (GitOps)
  • CI/CD Pipelines (rsync + Docker)


DATA & MESSAGING

  • PostgreSQL
  • PostGIS (geospatial)
  • Flyway migrations
  • Patroni (HA)
  • pgBackRest (PITR)
  • PgBouncer
  • HAProxy
  • MongoDB
  • Elasticsearch
  • Redis
  • Kafka
  • RabbitMQ
  • Amazon SQS
  • Saga Coordination
  • Server-Sent Events (SSE)
  • WebSocket
  • Web Push (VAPID)
  • Stripe Connect
  • Twilio Verify


MOBILE

  • Android (Kotlin/Java, Jetpack Compose)
  • iOS (Swift/SwiftUI)
  • Kotlin Multiplatform
  • Flutter


AI / COMPUTER VISION

  • YOLOv8
  • OpenCV
  • Scikit-Learn
  • Model Integration & Deployment


SECURITY

  • OAuth2
  • JWT
  • Magic-link OTP
  • Rate limiting
  • Authentication & Authorization Flows
  • OWASP Principles

Einsatzorte

Einsatzorte

Aachen (+150km)
Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

1 year 7 months
2025-01 - now

Solo practice designing, building, and shipping production systems

Founder & System Architect
Founder & System Architect
Solo practice designing, building, and shipping production systems end to end. Multi-project portfolio across social dance, commerce, AItooling, and custom client engagements, ~90 repositories and ~1 million lines of code.
  • DanceClub (flagship, danceclub.app), Multi-app production platform for social dance events. 11 Kotlin/Spring Boot microservicesspanning 67 Gradle modules with strict hexagonal boundaries (pub-dom, private-dom, dao, api, business, rest). 40 JPA entities, 574API endpoints, 59 Flyway migrations, 48 integration tests against real Postgres (no mocks). Three Next.js 16 frontends: discovery app(27 routes), organizer hub (11 routes), internal backstage (15 routes). 107,500+ LOC total. Shipped solo in 15 months, live in production.
  • PulseAI (pulseai.run), Multi-provider LLM orchestration engine: Claude, GPT-4, Gemini with automatic failover, streaming responsesend-to-end, and multi-tenant node execution. Powers DanceClub's automated event intake pipeline with headless browser dataextraction. Private beta, evolving into a public platform.
  • edvone.dev, Personal practice platform: 9 service pages, booking system (Google Calendar API with OAuth2 + timezone-aware slotgeneration), separate admin and client portals (OTP + password 2FA), co-founder pitch funnel with R2 attachment uploads, editorialmanifesto. Next.js 16 + Prisma + Neon Postgres + Resend transactional email.
  • Infrastructure: self-hosted across 5 Hetzner servers (Docker + Caddy reverse proxy + Cloudflare CDN + Cloudflare R2 object storage),full CI/CD via GitHub Actions (lint, type-check, test, build, deploy on every push), separated staging and production environments. ZeroVercel, zero AWS, zero cloud vendor lock-in.
  • Also: independent consulting, bespoke architecture reviews, AI workflow design ('Lead the Machine'), system audits, and soloarchitecture engagements for clients needing a second opinion or a production-ready rebuild.
on request
AAchen
2 years 10 months
2022-04 - 2025-01

Led architecture transformation and system modernization

Senior Software Engineer & System Architect
Senior Software Engineer & System Architect
Led architecture transformation and system modernization for a B2B SaaS company serving document processing and businessautomation workflows.
  • Led monolith-to-microservices decomposition: broke a Vaadin monolith into 12 independently deployable services, defining serviceboundaries, shared domain interfaces, migration sequencing
  • Designed multi-tenant data and identity architecture serving 50+ tenants: tenant isolation, centralized authorization, cross-tenantsecurity boundaries
  • Introduced and integrated an API Gateway: unified authentication, routing, cross-service security controls as single ingress layer
  • Architected the Optical Invoice Recognition (OIR) pipeline: YOLOv8 barcode detection, document parsing workflows, async jobprocessing, 90%+ detection accuracy across thousands of invoices
  • Built internal workflow tooling: configurable workflow editor and PDF toolkits for business process automation
  • Mentored a team of engineers on domain modeling, architectural decision-making, maintainable system patterns
  • Led cloud migration roadmap: deployment automation, containerization strategy, operational scalability
Gypsilon GmbH
AAchen
9 months
2021-06 - 2022-02

Architected and built a crypto-to-fiat transaction platform

Senior Software Engineer
Senior Software Engineer
Architected and built a crypto-to-fiat transaction platform from the ground up.
  • Defined domain boundaries, data flow, integration patterns with local exchange providers
  • Implemented core logic using hexagonal architecture for maintainability and independent domain evolution
  • Designed B2B and B2C interaction layers for unified business workflows across both market segments
  • Built end-to-end transaction pipelines: wallet operations, exchange orchestration, reconciliation flows
  • Mentored engineers on architecture reasoning and modular design practices
Logics7 Inc
5 months
2021-01 - 2021-05

Mobile Architecture

Software Engineer
Software Engineer
  • Defined mobile application architecture and guided end-to-end app development
  • Designed API integration patterns for stable app-to-backend communication
  • Delivered the initial Android MVP, establishing the product foundation
Digitex
8 months
2020-05 - 2020-12

Consulting & Systems

Software Engineer
Software Engineer
  • Provided technical consulting and engineering support across web and mobile applications for multiple clients
  • Analyzed and stabilized existing systems by resolving architecture, data flow, and integration issues
Upwork / Independent
1 year 4 months
2019-01 - 2020-04

Full-Stack Product Development

Founder
Founder
Built and launched web and mobile products as an independent founder.
  • Architected and built a web and mobile product platform from scratch: backend services, frontend UI, deployment workflows
  • Delivered two native mobile applications (iOS & Android) including product definition and release management
  • Owned full product lifecycle from scope to deployment
Appster
4 years
2015-01 - 2018-12

Built end-to-end web applications

Full-Stack Developer
Full-Stack Developer
  • Built end-to-end web applications for SMBs across multiple domains
  • Created custom CMS/CRM systems and internal workflow tools
  • Integrated payment systems and external APIs
  • Worked directly with clients on requirements, user flows, and delivery
Regus

Aus- und Weiterbildung

Aus- und Weiterbildung

2013 - 2018

Doctor of Medicine, MD

Bogomolets National Medical University, Kyiv, Ukraine


2012 - 2013

Russian Language and Literature

Diploma

Taras Shevchenko National University of Kyiv, Ukraine


2010 - 2011

English Literature

Diploma

American College of Dubai, UAE

Position

Position

  • Staff Engineer
  • Principal Engineer
  • Founding Engineer
  • Founding CTO
  • Entrepreneur in Residence (EIR)
  • Technical Lead
  • Fractional CTO

Kompetenzen

Kompetenzen

Top-Skills

Software Architecture Spring Boot Java Next.js Angular Kotlin TypeScript Python FastAPI Android Studio Xcode SWIFT JavaScript

Produkte / Standards / Erfahrungen / Methoden

Profile

System architect with 10+ years designing and shipping distributed systems across fintech, logistics, B2B SaaS, commerce, and AItooling. For the past two years my work has been AI-native: agents, MCP, and the tooling around them built into how systems getdesigned, written, and operated, not bolted on afterward. I run an independent practice from Aachen spanning roughly 90 repositoriesand a million lines of code, led by PLMHub (version control for models and agents), elvix (the identity platform my products authenticatethrough), and DanceClub (an 11-service platform live in production since 2025). Earlier, at Gypsilon GmbH, I led the decomposition of aVaadin monolith into 12 microservices with multi-tenant architecture for 50+ tenants, and mentored the team through the change. Kotlinand Spring on the backend, TypeScript on the front (Angular at Gypsilon, React and Next.js in my own products), self-hostedinfrastructure underneath. Comfortable owning any layer, happiest raising a team's bar. Medical training sharpened my analytical rigor and ability to operate under pressure. Icommitted fully to software architecture and product development.


TECHNICAL SKILLS

ARCHITECTURE & SYSTEM DESIGN

  • System Architecture (Web, Mobile, Cloud)
  • Distributed Systems
  • Domain Modeling (DDD)
  • Hexagonal Architecture
  • Event-Driven Systems
  • Microservices
  • API Gateway Design
  • Multi-tenant Architecture
  • Scalability & Availability Trade-offs


LLM & AI ENGINEERING

  • Multi-provider LLM orchestration (Claude, GPT-4, Gemini)
  • MCP (Model Context Protocol) servers
  • Agent workflow design
  • Context engineering & correction protocols
  • Streaming + failover patterns
  • Multi-tenant context isolation
  • Production-scale prompt engineering
  • AI-assisted development (Claude Code, Codex, Cursor)


TESTING & QUALITY

  • Testcontainers (real DB, no mocks)
  • JUnit 5
  • Mockito
  • AssertJ
  • Vitest
  • Playwright (E2E)
  • Biome
  • knip
  • detekt
  • ktlin


OBSERVABILITY

  • Prometheus
  • Grafana
  • Loki
  • Alertmanager
  • Blackbox probes
  • SLO & alert design


LANGUAGES & FRAMEWORKS

  • Kotlin
  • Java
  • TypeScript
  • JavaScript
  • Python
  • Swift
  • Dart
  • Spring Boot 3.5
  • Spring Security
  • FastAPI
  • Bun
  • Next.js 16 (App Router, RSC)
  • React 19
  • Angular
  • Tailwind CSS 4
  • Prisma ORM
  • Framer Motion
  • Zod
  • next-intl
  • Radix UI
  • shadcn/ui
  • Flutter


CLOUD & INFRASTRUCTURE

  • Hetzner
  • AWS (EC2, S3, IAM)
  • GCP
  • Docker
  • Docker Compose
  • Kubernetes (k3s)
  • ingress-nginx
  • Caddy (reverse proxy + auto-SSL)
  • Cloudflare (CDN, DNS, Workers)
  • Cloudflare R2 (S3-compatible object storage)
  • Neon Postgres (managed)
  • Terraform
  • Fly. io
  • GitHub Actions
  • GitLab CI
  • ArgoCD (GitOps)
  • CI/CD Pipelines (rsync + Docker)


DATA & MESSAGING

  • PostgreSQL
  • PostGIS (geospatial)
  • Flyway migrations
  • Patroni (HA)
  • pgBackRest (PITR)
  • PgBouncer
  • HAProxy
  • MongoDB
  • Elasticsearch
  • Redis
  • Kafka
  • RabbitMQ
  • Amazon SQS
  • Saga Coordination
  • Server-Sent Events (SSE)
  • WebSocket
  • Web Push (VAPID)
  • Stripe Connect
  • Twilio Verify


MOBILE

  • Android (Kotlin/Java, Jetpack Compose)
  • iOS (Swift/SwiftUI)
  • Kotlin Multiplatform
  • Flutter


AI / COMPUTER VISION

  • YOLOv8
  • OpenCV
  • Scikit-Learn
  • Model Integration & Deployment


SECURITY

  • OAuth2
  • JWT
  • Magic-link OTP
  • Rate limiting
  • Authentication & Authorization Flows
  • OWASP Principles

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