build time reduction
after application modernization
Open to international remote opportunities and relocation.
Senior Frontend Engineer building complex, fast and maintainable web products.
I build and modernize complex software systems, combining deep frontend expertise with commercial Node.js experience. My focus is on architecture, performance, and maintainability.
React · Next.js · TypeScript · Frontend Architecture · Performance · WebSocket · Node.js
Engineering impact
Measured improvements, with context.
Performance work is most useful when the baseline, intervention and limitation are all visible.
Commercial work
smaller JavaScript payload
through splitting and dependency optimization
Time to Interactive (TTI)
in a transport monitoring platform
Independent performance study
Lighthouse Performance
in a measured React-to-Svelte migration
JavaScript bundle
in the same migration experiment
Commercial metrics are based on internal project measurements and are described without exposing confidential implementation details.
Selected work
Systems, not just screens.
Independent projects with working demos, source code and the engineering decisions behind them.
01 / AI-assisted pull request review workflow
ReviewPilot AI
A personal Next.js application and GitHub App exploring structured pull request review. The public demo uses a deterministic mock provider; real LLM analysis requires the optional OpenAI-compatible integration.
- Contribution
- Product design, frontend architecture, GitHub integration and evaluation workflow
- Engineering result
- A complete review pipeline with validated, provider-independent structured output.
02 / Modernizing a browser-based WebAssembly game runtime
Diablo Web
A compatibility and architecture modernization of existing open-source browser and game-engine work, with typed runtime orchestration around WebAssembly, workers, canvas and browser storage.
- Contribution
- Frontend modernization, runtime boundaries, protocol validation, tests and delivery
- Engineering result
- A maintainable browser runtime shell with explicit boundaries around engine, worker and UI concerns.
03 / Real-time logistics monitoring interface
Fleet Route Monitor
A responsive operational dashboard that turns deterministic vehicle simulation into route progress, ETA, delay risk and actionable alerts.
- Contribution
- Interaction design, simulation model, map integration and testable operational state
- Engineering result
- A credible, repeatable monitoring experience without depending on a live fleet backend.
04 / Measured React-to-Svelte performance migration
Forest
An engineering experiment that measures the effect—and limits—of migrating the application layer from React to Svelte while keeping the image payload constant.
- Contribution
- Migration implementation, measurement design, analysis and documentation
- Engineering result
- 74% less JavaScript and a measured Lighthouse Performance increase from 75 to 92.
Experience
Modernization under real product constraints.
February 2025 — Present
Media Service
Frontend Engineer
Working on large-scale cultural and educational digital platforms, including public-facing and internal administrative products.
- Next.js and React platform modernization
- JavaScript-to-TypeScript migration
- Frontend architecture and module boundaries
- SSR, routing, bundle and Core Web Vitals optimization
- Reusable component systems
- Code review, mentoring, CI and testing improvements
February 2022 — February 2025
Logrocon
Frontend Engineer
Built and modernized enterprise products for banking, logistics, retail, monitoring and operational workflows.
- React and TypeScript modernization
- Real-time WebSocket interfaces
- Leaflet transport monitoring and JointJS diagram editors
- Webpack-to-Vite migration and monorepo development
- Legacy system refactoring and performance optimization
Client names and confidential implementation details are intentionally omitted.
About
Complexity made understandable.
I design clear boundaries around complex business logic, modernize shared libraries and migrate applications to TypeScript incrementally. My commercial work spans high-traffic public platforms, event-driven monitoring, conditional workflows, real-time interfaces and analytics dashboards. Regression tests, performance checks, CI/CD, release planning and rollback strategies help keep changes safe and maintainable.
Beyond frontend architecture, I have commercial Node.js experience with REST APIs, business logic, database integrations, authentication, authorization and external services, collaborating across frontend and backend boundaries. I have also integrated AI capabilities into frontend products.
Through personal projects, I explore full-stack architecture, other backend languages and frameworks, AI-powered applications and agent-assisted development. I keep responsibility for architecture, validation and testing when working with AI tools.
Contact
Have a complex frontend problem or an international role that could be a good fit?
john.maks595@gmail.comAstana, KazakhstanUTC+5Open to international remote opportunities and relocation.