Mykola Balielov

Mykola Balielov

Full-stack developer building production websites and systems

Next.js, TypeScript, and backend systems — selected live work below.

I ship fast websites and the APIs behind them. Open to full-time roles and to website projects.

  • Production Next.js sites
  • Live DACH case studies
  • Open to hire and freelance
@WebSocketGateway({ cors: true })
export class AIAgentGateway {
  @WebSocketServer()
  server: Server;

  @SubscribeMessage('voice_stream')
  async handleStream(client: Socket, payload: AudioBuffer) {
    // Initialize conversational AI pipeline
    const response = await this.aiService.processAudio(payload);
    
    this.server.emit('agent_reply', {
      status: 'processing',
      latency: 42,
      data: response
    });
  }
}

Stack

Core technologies

Tools I use to build production websites and backend systems.

  • Next.js
  • React
  • Tailwind CSS
  • Node.js
  • Nest.js
  • TypeScript
  • PostgreSQL
  • MongoDB
  • Redis
  • Docker
  • AWS
  • Google Cloud
  • WebSockets
  • Prisma
  • Jest

Work

Selected projects

Live websites and product work I designed and built.

  • Beauty Studio LK - Nail and hair studio · Büdelsdorf

    Beauty Studio LK

    Beauty Studio LK

    Nail and hair studio · Büdelsdorf

    Clear bilingual presence, online booking, and after-hours answers about services.

    Premium bilingual website (DE/RU) with structured services, booking, and an on-site AI assistant.

    Tech stack

    • Next.js
    • DE/RU
    • KI-Chat
    • Admin
    • SEO
  • Perfekte Kosmetologie LV - Cosmetology · Northern Germany

    Perfekte Kosmetologie LV

    Perfekte Kosmetologie LV

    Cosmetology · Northern Germany

    Services, prices, and events presented clearly before the first visit.

    Modern bilingual platform for an independent cosmetology studio.

    Tech stack

    • React
    • DE/RU
    • Express
    • Reviews API
  • Nexis - EdTech · AI testing platform

    Nexis

    Nexis

    EdTech · AI testing platform

    Automated tests, an AI generator, and teacher analytics in one place.

    School testing platform with AI-generated assessments and class analytics.

    Tech stack

    • Next.js
    • Gemini API
    • Analytics

Other commercial experience (under NDA)

Most of my backend architecture work — including low-latency WebSocket proxies for crypto data and enterprise communication platforms — is under NDA. I am happy to discuss architecture, system design, and optimization in an interview.

Practice

Experience & mentorship

Two threads that shape how I work: disciplined delivery and teaching.

Engineering rigor

Automated CI/CD with tight feedback loops — Claude in the loop for reviews, tests, and docs — so every merge stays predictable.

50%Faster PR reviews
Claude AIAutomated CI/CDCode quality

Formal mentoring

Teaching computer science fundamentals — algorithms, complexity, and systems thinking — so learners build durable mental models, not just syntax.

5+Years teaching
Computer scienceData scienceMentorship

Real-time architecture

Low-latency data pipelines and WebSocket systems for live tracking and communication.

5,000+Concurrent connections
WebSocketsRedisMicroservices

Cloud scalability

Highly available backend infrastructure across cloud providers for uptime and fast data access.

40%Latency reduction
AWSGCPPostgreSQL

Contact

Let's talk

Hiring, a new website, or a question about a case study — send a note or use the chat in the corner.

By sending this form you agree to be contacted by email.

Mykola Balielov

Open to roles and website projects