Open to opportunities

Nicolas Wernli

@nicowernli

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Senior full stack engineer delivering AI-powered, high-performance web products across SaaS, e-commerce, and analytics.

Spain

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What I'm looking for

I’m looking to lead full-stack engineering and ship scalable products—modernizing legacy systems, adopting AI-driven automation, and mentoring teams to deliver measurable impact.

I’m a Senior Full Stack Engineer with 15+ years delivering React, Angular, PHP, Go, and AWS-based products across SaaS, e-commerce, and analytics platforms. I’ve led teams of up to 10 developers and built APIs supporting ~2M daily page views and £4–5M in monthly transaction value.

I champion AI adoption in real delivery: at Reffle, I embedded AI-driven workflows across development, infrastructure, and process governance, increasing developer productivity by 60%. I also drive measurable automation outcomes—reducing client onboarding time by over 75% and scaling automation to support 433% client growth.

I’m hands-on with modernization and engineering standards, migrating legacy systems to high-performance SaaS and improving frontend performance and scalability. In recent work, I migrated a legacy WordPress platform to a SaaS architecture, built a PHP Laravel REST API, and led UI/UX modernization that reduced page load by 20% and improved Lighthouse scores by 15%.

Experience

Work history, roles, and key accomplishments

Team Lead

Reffle

Dec 2024 - Jul 2026 (1 year 7 months)

Led a legacy WordPress migration to a SaaS architecture and built a PHP Laravel REST API handling ~2M daily page views and 600k+ monthly transactions. Led UI/UX modernization and established frontend engineering standards, improving page load by 20% and Lighthouse scores by 15%.

PHP Laravel REST APIs UI UX Migration JavaScript Responsive Design Performance Optimization

Senior Fullstack Developer

Cecil

Mar 2021 - Dec 2024 (3 years 9 months)

Spearheaded development of high-performance SPAs using React and TypeScript to improve scalability and maintainability for complex product workflows. Maintained a high-performance Go and PostgreSQL REST API and collaborated with designers and backend engineers to deliver user-facing features.

React TypeScript Go PostgreSQL REST APIs

Senior Fullstack Developer

Cloudline Solutions

Jun 2018 - Mar 2021 (2 years 9 months)

Designed and developed responsive Angular and TypeScript interfaces to improve cross-platform usability. Designed and built high-performance REST APIs using Go, DynamoDB, AWS SQS, and AWS Lambda to support scalable cloud workflows.

Angular TypeScript Responsive UI REST APIs Go DynamoDB SQS AWS Lambda

Senior Frontend Developer

ClearPeaks

Nov 2017 - Nov 2018 (1 year)

Managed a team of 4 developers building an enterprise BI solution, improving dashboard performance and delivering scalable data visualization features. Translated business goals into scalable frontend architectures and user-friendly data interfaces.

Team Leadership Enterprise BI Data Visualization Frontend Architecture

Senior Fullstack Developer

Bestseller

Jan 2017 - Dec 2017 (11 months)

Improved a global e-commerce frontend by delivering new features and performance enhancements to strengthen the shopping experience. Developed multi-store e-commerce features under the Sales Cloud Commerce platform to support +32 brands within the Bestseller umbrella.

Performance Optimization Multi Store Development Sales Cloud