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Professional portrait of János Vermes

Welcome.

If you're curious about how thoughtful code becomes meaningful products—and how intelligent automation is reshaping what's possible—you're in the right place.

I'm János Vermes — Senior Software Engineer passionate about building scalable web applications and leading high-performing teams.

My work operates at the intersection of Angular, NestJS, React, Next.js, modern DevOps, and AI-driven automation—where architecture meets execution and systems evolve from functional to truly intelligent.

My Philosophy

I bridge deep technical expertise with strategic leadership to create measurable impact.

Strategic Architecture

I translate complex challenges into clear direction, whether it's UI dashboards, layering applications, designing resilient backend systems, or integrating AI to unlock new workflow capabilities.

Quality & Security

Code quality and security are at the heart of all my decisions. Robust testing, code reviews, and security best practices ensure solutions are reliable, maintainable, and protected from vulnerabilities.

Culture & Momentum

Mentoring is central to my work. I believe that strong engineering cultures don't just deliver features, they build ownership and sustainable, long-term value. I keep pushing for professional excellence by mentoring teams and supporting the people in them as they grow.

Scroll down to explore my technical skills and leadership journey.

Explore

Connect through the contact form to discuss what we could build next.

Expertise & Technical Arsenal

Mission

Driving software engineering across frontend, backend, DevOps, and cloud, with scalable architectures, maintainable UI/UX design systems, workflow automation, and AI-assisted development, combining a Senior Software Engineer mindset with a Team Lead attitude—mentoring teams, fostering growth, and open to evolving into Senior Fullstack/AI Solutions Architect or Platform & Developer Experience (DevEx) Specialist roles.

Core Capabilities

Frontend development with modern frameworks and reactive patterns
95%
Backend API design, data modeling, and microservices architecture
88%
Cloud infrastructure, CI/CD pipelines, and infrastructure as code
85%
UI/UX design systems with component-driven development
82%
Workflow and integration automation across internal and third-party systems
78%
AI-assisted development and automation using LLMs
75%
Product analytics and experimentation for data-driven decision making
72%

Product Analytics & Experimentation

(Amplitude + LaunchDarkly)

Product Analytics & Experimentation

  • Product and marketing analysis

    Comprehensive insights into user behavior, conversion funnels, and campaign performance to optimize product and marketing decisions.

  • User tracking with custom event taxonomy

    Structured event tracking architecture capturing custom user interactions, flows, and key metrics with consistent naming conventions.

  • Session replay and heatmap analysis

    Real user session playback and heatmap visualizations to identify UX issues and improve user engagement patterns.

  • A/B testing and feature flag management

    Controlled experiments with multiple variants, feature toggles with dynamic configuration management for gradual rollouts.

  • Partial rollouts and controlled experiments

    Strategic feature deployment to targeted user segments with risk mitigation and data-driven decision making.

Skill Matrix

Overview of capabilities by category

Frontend
12 Skills (24.5%)
Backend
9 Skills (18.4%)
DevOps & Cloud
9 Skills (18.4%)
Automation & Integration
6 Skills (12.2%)
UI/UX & Design Systems
5 Skills (10.2%)
AI/ML & Productivity
5 Skills (10.2%)
Product Analytics & Experimentation
3 Skills (6.1%)

Frontend

Angular TypeScript Nx Workspace Monorepo RxJS NgRx Tailwind CSS React Next.js SCSS HTML5 CSS3

Backend

NestJS Node.js PostgreSQL MongoDB Prisma Python REST APIs Laravel Swagger OAS 3

DevOps & Cloud

Docker Kubernetes GitHub Actions GitLab CI/CD AWS Azure GitLab Bitbucket CI/CD CapRover

UI/UX & Design Systems

Storybook Figma Component Libraries Design Systems Claude Design

Automation & Integration

n8n AG-UI Protocol Zapier Make Postman Webhooks

AI/ML & Productivity

Claude Code / Cowork Agents teams / Design ChatGPT / Codex and Agents GitHub Copilot Agents / Spark Gemini 3 Pro / Google Antigravity Agents X AI - Grok 4.5 / Grok Build and Agents

Product Analytics & Experimentation

LaunchDarkly Amplitude Hotjar

Experience & Leadership

A journey through engineering excellence, team leadership, and continuous growth

Jun 2024 — Mar 2026

Vestas

I led a frontend engineering team building enterprise SaaS products, drove the technical strategy and built a culture of continuous improvement.

Team of 8
4 Key Achievements

Key Responsibilities

  • Defined and executed the technical roadmap for the platform engineering division
  • Oversaw architecture decisions for the microservices migration
  • Established engineering best practices, code review standards, and CI/CD pipelines
  • Partnered with Product and Design to align technical capabilities with business goals
  • Drove professional development across the team

Key Achievements

Delivered 5 major features in 3 months

Successfully planned and delivered a greenfield SaaS product from concept to production

85% faster releases

Reduced deployment cycle time from 2 weeks to 2 days

3 frontend apps migrated into a single Nx monorepo

Led migration from individual monolith to monorepo architecture

40% quality improvement

Improved system security and code quality

Leadership & Mentorship

8Team Size
3Direct Reports
  • Mentored 2 mid-level developers, 2 promoted to senior level
  • Created internal tech talks program with 10+ sessions delivered

Technologies & Skills

Angular (v15-20)AmplitudeLaunchDarklyFigmaStorybookRxJSNgRxTypeScriptJavaScriptHTML5CSS3SCSSWebComponentsMicroservicesCookieInformationNestJSDockerKubernetesAzure CI/CDGitHub ActionsCopilotLLMsClaude AIChatGPTClaude CodeAWSAgile methodologiesOne JiraBitbucketMicrosoft TeamsMicrosoft SharePointsPostgreSQLTeam Leadership
Mar 2017 — Jun 2024

Utopus Insights

I progressed from Mid-Level Front-End Developer to Senior Developer and ultimately to Lead Developer through consistent technical contribution and leadership.

Team of 5
3 Key Achievements

Key Responsibilities

  • Collaborated internationally with designers, developers, and managers across the USA, Europe, and India
  • Contributed to web application architecture, technical refinement (grooming), UX design, and frontend development
  • Led and coordinated a frontend team of 3–5 developers
  • Owned and drove technical decision-making across multiple projects
  • Onboarded and mentored new team members; delivered structured knowledge transfer on Angular (v4–15), multilingual applications, NgRx, RxJS, BEM methodology, WebSockets, and internal company technologies
  • Defined, estimated, and tracked technical user stories in Jira
  • Reviewed, approved, and merged frontend pull requests in GitLab and Bitbucket
  • Led frontend recruitment: conducted interviews, designed technical assessments, and evaluated candidates

Key Achievements

40% better operational efficiency

Delivered a real-time monitoring and analytics solution for wind and solar energy management, enhancing operational efficiency

30% faster responses

Delivered an asset management platform with real-time data visualization and predictive analytics, improving decision-making for clients

50% faster development cycles

Contributed to a shared design system and component library, improving UI consistency and development efficiency across multiple projects

Leadership & Mentorship

5Team Size
  • Mentored 2 junior developers, 1 promoted to mid-level
  • Onboarded 2 new team members with structured ramp-up program

Technologies & Skills

Angular (v4–15)TypeScriptJavaScriptWebSocketsRxJSNgRxHighChartsHTML5BEM methodologyCSS3SCSSMapBoxLaunchDarklyJiraConfluenceAgile methodologiesFigmaBitbucketGitlabGitLab CI/CDStorybookResponsive designNpm librariesMongoDBDockerJenkinsSwagger OAS 2AWS Amplify, DynamoDB, S3, Lambda, Step Functions, Api Gateway, CloudWatch, Cognito, Artifact RegistryTechnical Leadership
Aug 2015 — Mar 2017

IBM

I built an application that animates a three-day weather forecast on a map and a chart at the same time.

1 Key Achievements

Key Responsibilities

  • Developed user interfaces for a range of projects with Dojo, jQuery, HTML5, and CSS3
  • Took part in international projects
  • Animated weather forecasts in the browser with WebGL (MapBox)
  • Communicated daily with managers in the USA

Key Achievements

20% engagement increase

Built a weather forecast visualization tool that increased customer engagement

Technologies & Skills

AngularJSAngular (v2–4)JavaScriptSCSSGitDojo ToolkitjQueryHTML5CSS3WebGLMapBoxLaravel

References

Products I helped build and websites I delivered end to end

Enterprise product

  • Scipher®

    2017–2026

    AI and IoT energy analytics platform · Utopus Insights / Vestas

    Scipher® is Vestas's AI- and IoT-driven energy analytics platform, used by wind and solar asset owners and operators to monitor, forecast and optimise their portfolios. As a frontend developer I worked on the Vx and Vx+ modules, in close collaboration with project managers, UX designers and backend developers.

    My role: Frontend Developer

    • Angular
    • TypeScript
    • RxJS
    • NgRx
    • WebSockets
    • Highcharts
    • MapBox
    • Storybook
    Visit vestas.com (opens in a new tab)

Freelance projects

  • ICEGO

    2026

    Air-conditioning installation and service

    A website and back-office system for an air-conditioning installer, built from scratch — from gathering the client's requirements through design to full development, with Claude Code and Claude Cowork. Behind the public site sits an admin interface for automated quote generation, job tracking, device management, stock control and editing the promotions and service prices shown on the site.

    My role: Requirements, design and full-stack development

    • React
    • Next.js
    • PostgreSQL
    • Supabase
    • Resend
    • Cloudflare
    • Claude Code
    • Claude Cowork
    Visit icego.hu (opens in a new tab)

  • SayCheese Fotótükör

    2026

    Photo-mirror rental for events

    A website for an event photo-mirror rental, built from scratch — from the client's requirements through design to full development, with Claude Code and Claude Cowork: services, pricing and booking enquiries with automated e-mail notifications.

    My role: Requirements, design and development

    • HTML
    • JavaScript
    • Resend
    • Cloudflare
    • Claude Code
    • Claude Cowork
    Visit sctukor.hu (opens in a new tab)

  • Várady és Fia Kft.

    2023

    Vehicle and metal-structure corrosion protection

    A company website presenting the services, products and references of a corrosion protection specialist. I built it with WordPress and Elementor, and I maintain it on an ongoing basis.

    My role: Design, development and maintenance

    • WordPress
    • Elementor
    Visit varady.hu (opens in a new tab)

  • Magyar Vár Alapítvány

    2022

    Cultural foundation · Pomáz

    A marketing website and a ticketing webshop for a cultural foundation. I designed and built everything end to end — frontend, backend, database and an admin interface where the team manages its programmes. Visitors buy event tickets with SimplePay; each ticket is generated automatically with a QR code that is validated at the entrance.

    My role: Design and full-stack development

    • Angular
    • NestJS
    • MongoDB
    • SimplePay
    • CapRover
    Visit magyarvar.hu (opens in a new tab)

Let's Connect

Have a role in mind or just want to chat? I'd love to hear from you.

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janos@vermes.dev

I typically respond within 24 hours. Looking forward to connecting with you.