Open to opportunities

Jonathan Searra

@jonathansearra

Message

Senior front-end developer with 18 years’ experience building accessible, modern web apps.

Germany

Message

What I'm looking for

I’m looking to build modern, accessible front-end products in Agile teams—integrating RESTful APIs, improving performance with scalable JavaScript architecture, and delivering interactive dashboards with strong quality through testing and code reviews.

I’m a programmer with 18 years of experience across full-stack and front-end development, with deep expertise in modern frameworks including Svelte, Angular, and Vue, alongside Node and TypeScript/JavaScript. I’m experienced in Agile/Scrum and Kanban, and I bring strong communication and teamwork to deliver customer-focused products.

In my current role as Senior Front-End Developer at Sematell GmbH (May 2025–Present), I developed a brand-new product using Svelte, TypeScript, Tailwind, and Shadcn, and I introduced accelerated development workflows leveraging AI API tools like Copilot and Claude. I integrate RESTful APIs and real-time data visualization to build interactive dashboards, lead code reviews, and improve quality with automated testing frameworks like Vitest—cutting front-end bugs and accelerating release cycles.

Experience

Work history, roles, and key accomplishments

Current

Senior Front-End Developer

Current

Sematell GmbH

May 2025 - Present (1 year 1 month)

Developed a brand-new product using Svelte and TypeScript, integrating RESTful APIs and real-time data visualization for customer support dashboards. Led code reviews, set up automated testing (Vitest), and collaborated with product managers to align delivery with business goals.

Svelte Typescript Javascript REST APIs Vitest Git Agile Scrum

Software Engineer

GBTEC Software AG

Feb 2024 - Dec 2024 (10 months)

Built and maintained a large-scale Node.js and Angular application, including upgrades to an API gateway by replacing Siren with a custom standalone service. Collaborated with backend and UX teams to deliver application improvements.

Node Angular TypeScript API Gateway Application Maintenance UX collaboration JavaScript

Front-End Developer

Projekt0708

Jul 2023 - Jan 2024 (6 months)

Developed and expanded job websites for multiple German companies using a modular, responsive one-page architecture. Integrated Angular and React into existing SAP SuccessFactors websites, implemented REST-based search, and optimized legacy code including SCSS workflow.

Angular React Responsive Web Design SAP SuccessFactors Bootstrap SCSS Performance Optimization

Software Developer

Western Cape Health Department

Jan 2020 - Feb 2023 (3 years 1 month)

Designed, created, and maintained reusable Angular components and modules for web applications. Built modular solutions using directives, services, and dependency injection, ensuring integration with RESTful APIs in collaboration with UX/UI and product teams.

Angular TypeScript Directives Services Dependency Injection RESTful APIs