Portrait of Sergei Muller

Sergei Müller

Senior full-stack engineer • TypeScript/JavaScript • Architecture & performance • UK

About

I'm a senior full-stack engineer with 20+ years of experience building data-rich web apps and leading front-end/platform initiatives. I love clean architecture, pragmatic testing, and wringing performance out of complex UIs.

My toolbox: TypeScript, React/Vue, Node/Express, GraphQL/REST, Jest/Cypress, and Mapbox/Leaflet.

Outside of work I tinker with ethical-tech ideas, play guitar, and chase sunny places to work remotely.

TypeScript React & Vue Node / Express GraphQL / REST TDD / BDD System Design

Work

Kpler — Senior Front-End Engineer

Shipping & maritime data platform • 2023 — present

Lead front-end work on voyage & freight calculators, emissions costs, dynamic fuel-consumption tables, and multi-leg route planning. Improved management and performance across large codebases.

Previous

Java, PHP and Full-stack roles • 2000s — 2020s

Delivered production systems across web and data domains, mentored engineers, and shipped features end-to-end from API design to pixel-perfect UI.

Contact

Not currently open to new roles, but always open to new connections.