Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Senior Frontend Engineer with 9+ years of experience designing, scaling, and modernising customer-facing web platforms across eCommerce and insurance. Specialises in frontend architecture, design systems, performance, and AI-powered product experiences. Leads complex technical initiatives, shapes architectural decisions, and mentors and onboard engineers to improve product outcomes and engineering effectiveness. Experienced in SSR/SSG, accessibility (WCAG AA), i18n, performance optimisation, and quality engineering practices (testing strategies, Vitest, Playwright). Builds LLM-powered and AI-assisted engineering workflows using tools like Claude Code and Cursor, while partnering with product and analytics stakeholders to drive measurable improvements in conversion, reliability, and delivery speed.…Senior Frontend Engineer with 9+ years of experience designing, scaling, and modernising customer-facing web platforms across eCommerce and insurance. Specialises in frontend architecture, design systems, performance, and AI-powered product experiences. Leads complex technical initiatives, shapes architectural decisions, and mentors and onboard engineers to improve product outcomes and engineering effectiveness. Experienced in SSR/SSG, accessibility (WCAG AA), i18n, performance optimisation, and quality engineering practices (testing strategies, Vitest, Playwright). Builds LLM-powered and AI-assisted engineering workflows using tools like Claude Code and Cursor, while partnering with product and analytics stakeholders to drive measurable improvements in conversion, reliability, and delivery speed.

Alex (Alejandro) Arevalo Martin

Front-End Developer, Web Developer, Software Engineer, +4





Senior Frontend Engineer with 9+ years of experience designing, scaling, and modernising customer-facing web platforms across eCommerce and insurance. Specialises in frontend architecture, design systems, performance, and AI-powered product experiences. Leads complex technical initiatives, shapes architectural decisions, and mentors and onboard engineers to improve product outcomes and engineering effectiveness. Experienced in SSR/SSG, accessibility (WCAG AA), i18n, performance optimisation, and quality engineering practices (testing strategies, Vitest, Playwright). Builds LLM-powered and AI-assisted engineering workflows using tools like Claude Code and Cursor, while partnering with product and analytics stakeholders to drive measurable improvements in conversion, reliability, and delivery speed.…Senior Frontend Engineer with 9+ years of experience designing, scaling, and modernising customer-facing web platforms across eCommerce and insurance. Specialises in frontend architecture, design systems, performance, and AI-powered product experiences. Leads complex technical initiatives, shapes architectural decisions, and mentors and onboard engineers to improve product outcomes and engineering effectiveness. Experienced in SSR/SSG, accessibility (WCAG AA), i18n, performance optimisation, and quality engineering practices (testing strategies, Vitest, Playwright). Builds LLM-powered and AI-assisted engineering workflows using tools like Claude Code and Cursor, while partnering with product and analytics stakeholders to drive measurable improvements in conversion, reliability, and delivery speed.

Available to hire

Senior Frontend Engineer with 9+ years of experience designing, scaling, and modernising customer-facing web platforms across eCommerce and insurance. Specialises in frontend architecture, design systems, performance, and AI-powered product experiences. Leads complex technical initiatives, shapes architectural decisions, and mentors and onboard engineers to improve product outcomes and engineering effectiveness.

Experienced in SSR/SSG, accessibility (WCAG AA), i18n, performance optimisation, and quality engineering practices (testing strategies, Vitest, Playwright). Builds LLM-powered and AI-assisted engineering workflows using tools like Claude Code and Cursor, while partnering with product and analytics stakeholders to drive measurable improvements in conversion, reliability, and delivery speed.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Spanish; Castilian

Fluent

Catalan; Valencian

Fluent

English

Advanced

Work Experience

Senior Frontend Engineer at Neilson Financial Services

March 1, 2026 - Present

Developed, stabilised and modernised a business-critical document configuration platform with React, Next.js and TypeScript, supporting life-insurance quote journeys, regulated customer communications and call-centre operations. Improved automated test coverage from 23% to 69% and reduced production defects by 61%. Shaped frontend architecture, testing strategy and engineering standards to improve maintainability and delivery confidence across customer-facing and operational workflows. Built an AI-assisted engineering harness using Claude Skills, Cursor rules, specialised agents and reusable development workflows to improve implementation consistency, onboarding and team productivity.

Senior Frontend Engineer at VoucherCodes

January 1, 2019 - March 1, 2026

Owned frontend architecture and delivery for a production LLM-powered conversational discovery platform using React and TypeScript, defining interaction patterns for streaming responses, accessibility, analytics, experimentation and recovery workflows. Architected and led frontend delivery for Deals.com, an international commerce platform built with Astro, React and TypeScript; launched the first market and contributed to revenue exceeding operating costs. Led a six-month migration of a large Vue 2/Nuxt 2 codebase to Vue 3/Nuxt 3 coordinating delivery across a five-engineer team, eliminating legacy security vulnerabilities and completing migration with zero downtime and no customer disruption. Co-developed a design system for a multi-tenant commerce platform using shared accessible components and design tokens with tenant-specific styling. Reduced CI execution time by 60% by migrating from Jest to Vitest; introduced GraphQL Codegen across teams to improve type safety and reduce integra

Advanced Consultant & Engineer at Alten

June 1, 2017 - January 1, 2019

Developed Angular and Vue frontend applications for insurance and financial-services clients, delivering customer-facing journeys and reusable UI components. Built insurance workflows for AXA and contributed to a digital wallet application used in customer-facing environments. Collaborated in agile teams to deliver responsive frontend features while maintaining product quality.

Advanced Consultant & Engineer at Altran

June 1, 2017 - January 1, 2019

Frontend Developer (Internship) at Atmir

September 1, 2016 - March 1, 2017

Developed single-page applications in Angular in agile enterprise teams.