Want to build a composable website, a data-heavy web app, or something in between? With years of front-end development expertise, I can create engaging, robust user experiences across all modern browsers and devices. I create component libraries, ensure smooth animations, adherence to accessibility guidelines, and provide load time improvements, on-site SEO, automated testing, multi-language support, third-party API integrations, user tracking, A/B testing, and Core Web Vitals optimization.
Headless CMS Integration
Is your content management chaotic and time-consuming? With cutting-edge headless CMS solutions like Contentful or Sanity, I can help set up a content hub to streamline your content across all platforms, including websites, mobile apps, e-commerce platforms, and games. From setup to seamlessly connecting your headless CMS to your website or application, I offer expertise in content modeling, data migrations, and customized content editing experiences, providing solutions tailored to your unique business needs.
API Design & Development
Looking to power your web application with a robust and scalable API? With my expertise in modern back-end technologies, I can help you build powerful and flexible solutions tailored to your needs. Whether you're looking to develop RESTful APIs for seamless data exchange or harness the flexibility and efficiency of GraphQL for your application, I've got you covered. Let's work together to craft an API that powers your applications with speed and reliability.
MongoDB Modeling & Integration
With my expertise in MongoDB, I can help you design and implement scalable, high-performance databases tailored to your needs. Whether you're building a data-heavy application, managing complex data structures, or optimizing existing databases, I provide solutions that ensure efficient data storage, retrieval, and management. Let's transform your data management strategy and elevate your application's performance.
Cloud Hosting, CI/CD & Docker
With expertise in modern cloud hosting platforms like Vercel and Netlify, as well as comprehensive CI/CD pipelines, I help streamline deployment processes for maximum efficiency. I also bring solid experience with Docker, enabling consistent and portable development and production environments, simplifying builds, and improving scalability. Leveraging technologies such as incremental static regeneration (ISR) and global CDNs, I ensure fast, reliable deployments — even for large websites with thousands of pages. The result: blazing-fast load times, robust handling of high traffic, and an exceptional user experience.
Projects
Curious about what I can deliver? Explore a selection of projects I've worked on.
PITCHFOX.ai
AI role-play platform to master business conversations.
startup
front-end
back-end
ux/ui
ai
PITCHFOX is an AI-powered roleplay app designed to help introverted founders, freelancers, and creators boost their confidence and communication skills in pitching, sales, and networking. Users practice lifelike conversations with diverse AI personas simulating real-world scenarios — from investor meetings to client calls — within a judgment-free environment. The app provides structured roleplay sessions and actionable feedback across key performance metrics like clarity, confidence, and responsiveness. Currently in early validation, PITCHFOX is building toward its first working demo to empower non-salesy people to communicate with impact.
In February 2023, Natascha Fadeeva and I joined forces to launch "appocados," a premier vegan recipe platform tailored for the vegan community. This dynamic platform empowers vegan food bloggers and influencers to prominently display their recipes via the appocados mobile application. At its core, the system boasts a user-friendly mobile app filled with premium vegan recipes, complemented by a specialized web back-end for content creators. Client applications effortlessly synchronize with our platform, thanks to our GraphQL-based recipe API, developed using Apollo. Furthermore, I took the initiative to conceptualize, design, and bring to life our company's website at www.appocados.com, crafted with Astro and Svelte.
Website relaunch from WordPress to blazing-fast headless CMS solution.
freelance
front-end
back-end
cms
I was engaged by Studitemps GmbH to spearhead the transformation of their corporate website from studitemps.de to jobvalley.com. Transitioning away from the initial WordPress infrastructure, we employed cutting-edge technologies including Contentful, Next.js, and Tailwind to achieve a high-speed, headless solution. Collaborating seamlessly with the Marketing and UX/UI departments, our cohesive team efficiently initiated the project. Despite a tight deadline, we launched the primary version in just a few weeks. Over the subsequent months, we further enhanced the platform by incorporating features such as automated job postings through an in-house job API, and integration with prominent external job platforms like Xing and Indeed.
UX/UI design and front-end development for a bidding platform
freelance
front-end
ux/ui
Commissioned by bettercodeLABS to enhance the UI of their existing prototype into a production-ready design, I utilized Figma to create a user-centric design prioritizing simplicity and functionality. Through wireframing and prototyping, I developed a clickable prototype in Figma for desktop and mobile devices, ensuring an intuitive interface. The implementation of the design into the client application involved React.js and Material UI for a polished and consistent look. Real-time updates were seamlessly integrated via a REST API, elevating user engagement and responsiveness. The result is an optimized UI that enhances the overall bidding experience.
When
Oct 2023 - Dec 2023
Tech-stack
TypeScript, React, MaterialUI, Docker
Tools
Figma
Client
bettercodeLABS L.L.C-FC
Industry
Food
fluege.de
I had the privilege of collaborating with the front-end team at fluege.de, a leading German air travel comparison portal.
freelance
front-end
The web application go.fluege.de efficiently sifts through thousands of airlines to give users the best flight options at unbeatable prices. In this project, I had the chance to work with Invia Flights' front-end team to modernize the existing platform. We made use of technologies such as Web Components, Polymer, Lit, and Redux and integrated the booking forms with a complex REST-based microservice architecture.
Front-end development and REST API design for an online portal to share educational resources.
freelance
front-end
In cooperation with robole and Knick Design, we developed the online platform politischbilden.de for our client Adb - Arbeitskreis deutscher Bildungsstätten. This platform serves as a unique hub for teachers to share resources on political education. My task was to develop the front-end and design a RESTful API using Swagger to create a seamless interface to our custom CMS. Using React and Gatsby as foundational tools, we ensured exceptionally fast loading speeds due to Gatsby's static page generation and advanced image optimization.
Development of the Client II website about the support measures of the German Federal Government.
freelance
back-end
front-end
cms
CLIENT II is an initiative by the Federal Ministry of Education and Research of the Federal Republic of Germany (BMBF) that promotes research collaborations tailored to the needs of select emerging and developing nations. The website offers an in-depth view of all funded projects and provides the latest news, events, and updates related to CLIENT II. I was responsible for implementing Drupal as the website's content management system. Additionally, I developed an interactive global map using Mapbox to showcase the diverse funding projects.
Front-end development support for a cloud-based telematics platform.
employment
front-end
ux/ui
At XPURE GmbH, I had the opportunity to work on the RIO project, a cloud-based telematics platform that integrates the entire transport and logistics ecosystem. My team was in charge of developing the performance analysis module, which assesses the efficiency of individual truck drivers. Our team of 8 to 10 team members developed systems to collect sensor data from the trucks, transmit it to the back-end, and then present it clearly on the front-end with intuitive dashboards, detailed reports, and recommended actions. My primary responsibility was the front-end development, working closely with the UX/UI team and the back-end developers. The front-end was developed using React and Bootstrap. To ensure consistency throughout the project, we also developed a cross-team UIKit to ensure a consistent look and feel across the platform.
Side project - an open-source library I built to handle 2D grid data structures.
side project
open-source
In 2018, I found myself deeply drawn to a career in game development. I frequently engaged with grid data structures, useful in applications like board games or arranging objects within 2D rooms. These structures are often visualized as two-dimensional arrays, commonly termed "grids". Realizing I was repeatedly crafting similar helper functions for these grids, I consolidated them into an open-source library named "gridl", which I then shared on npm. For users' convenience, I also launched a dedicated documentation site, gridl.js.org, crafted using Gatsby and TailwindCSS. This documentation is auto-generated via TypeDoc, sourced directly from the library's internal JSDocs comments.
Let me help you creating high-quality digital products.
Testimonials
Sascha is one of those rare people you just don't come across often – genuinely kind, rock-solid, and 100% trustworthy. We've been working together for years on Landbot and Ninox projects, and he always delivers: fast, pragmatic, and solid. Low-code wasn't his thing at first, but now he's really got the hang of it. Would we recommend him? Only if we have to – we'd rather keep him to ourselves. Sascha supported us with the relaunch of our corporate website jobvalley.com. We benefited greatly from his broad and deep expertise in front-end and back-end development, as well as in UX/UI. Thanks to his wealth of experience, he was always able to find a suitable solution even for complex problems. With his friendly and professional manner, he quickly integrated himself into the project team. We could rely on him 100% and I would be very happy to work with him again. Sascha has a deep understanding of software development and was quickly able to unfold his solid tech expertise in our complex architecture. He has always been a thoughtful, insightful, motivated developer and his passion and enthusiasm for development helped our team evolve further to create more efficient solutions to lift our projects to the next level. Sascha is one of the few developers I've stayed in touch with as a freelancer, and also (consciously) worked together on several projects. He not only has high quality standards, he also has the right interpersonal skills that make him a well-balanced teammate that I enjoy working with. Sascha is playful, curious, and not afraid to dive into new technologies and trends that are outside his comfort zone. Sascha is a first-class developer. His social skills made the collaboration in the team very pleasant. Together we worked on the relaunch of the jobvalley website. With his expertise, we created a very modern and clean codebase that is fun to work in. If I could put together a dev team in the future, Sascha would definitely be part of it. Sascha has been developing sophisticated full-stack solutions with us for several years. His way of working is characterised by the highest quality, adherence to deadlines and professional and friendly communication. We are happy to have such a talented and reliable developer in our network.
Thomas Roth
Head Of Development
MAHENA - marketing.services.kommunikation
Felix Wolf
Online Marketing Manager
Studitemps GmbH
Alexander Baehr
Team Lead Front-end
Invia Flights Germany GmbH
Murat Kemaldar
Front-end Developer
Freelancer
Chrissy Topal
Front-end Developer
Freelancer
Martin Wilmer
Managing Director
robole - Kabisch & Wilmer GbR
Let's connect!
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