Frontend architecture
for products that
need to scale.
I'm Tymek — a senior frontend engineer with 8 years of experience building complex, high-traffic systems. I specialize in architecture, React, and design systems that teams actually want to work with.
Where I focus my work
Eight years of depth across frontend engineering, architecture, and technical leadership. Not a generalist — a specialist who knows where the hard problems live.
Frontend Architecture
Structural decisions that hold up under real scale. Module boundaries, data flow, dependency management — designed to last.
React & TypeScript
Component design, performance patterns, type safety across large surfaces. Not just working code — code that doesn't become a problem six months later.
Design Systems
Building the foundation teams build on. Token systems, component APIs, documentation, tooling — systems that accelerate rather than constrain.
Performance
Measured, targeted optimization. Bundle analysis, rendering strategy, Core Web Vitals — with direct impact on user experience and business metrics.
Technical Leadership
Engineering standards, code review culture, architectural direction. Building environments where good engineers do their best work.
Product Engineering
Enough product and UX context to make the right tradeoffs. The gap between "works" and "right" is where this matters most.
AI Product Engineering
Building the frontend layer of AI-powered products. Streaming interfaces, LLM API integration, real-time inference UI — and the structural patterns that keep AI features maintainable as models evolve.
How I engage
Focused engagements, defined scope, real outcomes. I work with a small number of clients at a time to ensure full attention and quality.
Architecture Review
An honest assessment of your frontend codebase. I identify structural risks, performance bottlenecks, and maintainability problems — with a clear path forward.
Embedded Engineering
Working directly within your team on complex frontend problems. Not advisory — hands-on. I write code, lead architecture decisions, and raise the technical bar.
Design System Build
From token infrastructure to component library to documentation. Built for your team's workflow, not a generic reference implementation.
Performance Audit
Deep diagnosis of rendering bottlenecks, bundle bloat, and Core Web Vitals issues. Prioritized by actual user impact, not just Lighthouse scores.
AI Feature Integration
Taking your AI capabilities to the product surface. Streaming responses, tool-call UIs, structured output rendering, loading states that don't feel broken — the frontend work that makes AI features feel polished rather than bolted on.
Custom engagements available for larger scope
I build the frontend layer
of AI-powered products.
Streaming interfaces
Token-by-token streaming with graceful loading states, partial renders, and error recovery. Users feel the speed — even when the model is slow.
LLM API integration
Clean abstraction layers over OpenAI, Anthropic, and open-source models. Prompt management, retry logic, and structured output parsing that doesn't leak into component code.
AI-native UX patterns
Chat interfaces, copilot sidebars, inline suggestions, tool-call visualizations. Patterns that feel native — not retrofitted from a non-AI product.
Maintainable as models change
AI product frontends that don't break when you swap providers or upgrade a model. Architecture decisions made with that volatility in mind from day one.
Works with: OpenAI · Anthropic · Vercel AI SDK · open-source models
Problems I've solved
A selection of complex engineering work. Names withheld under NDA — details available on request.
U.S. Enterprise E-commerce Platform
Cooperated with a U.S. team on rewriting an e-shop for one of the largest office supplies providers in the United States — used by 300,000 companies and millions of end users, with over 1,000 concurrent visitors at peak. The core challenge: the platform is highly customizable per customer, with independently configured product catalogues, pricing, and availability. Building for that level of variability required disciplined architecture from the start.
iOS & Android App — 2M+ Downloads
Worked with a Swedish engineering team on a mobile app with over 2 million downloads. Contributed new features, built reusable internal components, and participated in product and technical decision-making. Focused on performance optimization and maintainability — including pair programming sessions to share patterns across the team.
Technology Audit & Stack Decision
Conducted a comprehensive technology audit for a product team standing at an architectural crossroads. Evaluated competing approaches, frameworks, and tooling choices against the team's actual constraints — scale expectations, delivery timeline, and maintenance capacity. The recommendations directly influenced the technology decisions made, saving significant time and budget that would have been spent building on the wrong foundation.
AI-Powered Knowledge Platform
Built the frontend of a B2B knowledge platform with LLM-powered search, streaming chat, and structured document generation. Architected the AI feature layer — streaming responses, tool-call visualizations, and fallback handling — keeping it maintainable as underlying models and providers evolved.
Technologies I work with
Built over 8 years of real-world usage. Each tool chosen for a reason — not resume-padding.
Seniority is about
what you don't
have to explain.
I work best with teams that want a senior engineer who takes ownership — not a contractor who needs hand-holding.
Ownership, not task completion
I take responsibility for outcomes, not just my assigned work. If something adjacent is wrong, I say so.
Systems thinking
I design for the fifth feature, not just the first. Decisions made early determine what's possible later.
Honest communication
No overpromising. If a deadline is unrealistic or an approach is flawed, you'll hear it from me — clearly and early.
Product awareness
I understand why decisions matter, not just how to implement them. This changes the quality of the tradeoffs I make.
Clean, reviewable code
Code I write is easy to read, easy to extend, and easy to delete when requirements change.
Deep frontend knowledge
Eight years of working on hard frontend problems — architecture, performance, systems — not just shipping features.
Tymoteusz Tracz
Frontend Architecture & Engineering
Rzeszów, Poland · Worldwide
I've spent the last eight years building frontend systems for products that couldn't afford to get it wrong. E-commerce platforms, SaaS tools, financial applications — the kind of work where performance, reliability, and long-term maintainability are real constraints, not aspirations.
For the past few years I've been operating as Head of Frontend Guild — setting engineering standards, leading architecture reviews, and growing teams. I've seen what separates codebases that age well from ones that become liabilities.
I started CHARTCODE to work directly with companies that want to raise their frontend bar. I take a small number of engagements at a time, which means full attention, not divided effort.
Ready to raise your
frontend standard?
Tell me about your project or challenge. I'll let you know whether I can help — and how. No commitment required.
I typically respond within 24 hours on business days.