Sascha Klatt full-stack
web developer

  1. 🙋🏻‍♂️ Hi, I'm Sascha
  3. 💻 Freelance web developer
  4. 🗿 14 years of work experience
  5. 🎯 Focus on JS/TS and Node.js
  6. 🧩 Headless CMS integrator
  7. 👨🏻‍🎨 Eye for aesthetics
  9. 🍃 Climber, Runner, Cyclist
Contact me! Download CV
An iPhone showing Sascha Klatt.

my services

Here's what I can do for you 🧑🏻‍💻

  • Front-end Web Development

    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.

    Illustration of a mobile phone with UI components floating on top.

  • 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.

    Illustration of all content of the headless CMS distributed to different devices.

  • 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.

    Illustration of a MongoDB database with documents and a lock.

  • 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.

    Illustration of a cloud and a screen connected by wires.

  • 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.

    Illustration of a rocket deploying content to a cloud.

Projects

Curious about what I can deliver? Explore a selection of projects I've worked on.

  • Screenshot of the project PITCHFOX.ai

    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.

    Website
    www.pitchfox.ai
    From / to
    since Apr 2025
    Tech-stack
    TypeScript, Next.js, Shadcn, MongoDB, Node.js, OpenAI, Auth.js, Vercel, Stripe, PostHog
    Tools
    GitLab, Whimsical, JIRA
    Industry
    Education
    Team size
    Solo
  • Screenshot of the project jobvalley.com

    jobvalley.com

    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.

    Website
    jobvalley.com
    From / to
    since Feb 2021
    Tech-stack
    React, Next.js, Tailwind CSS, MongoDB, Node.js, Contentful, Storybook, Vercel
    Tools
    JIRA
    Client
    Studitemps GmbH
    Industry
    Recruitment
    Team size
    5 team members
  • Screenshot of the project appocados.com

    appocados.com

    A vegan recipe platform.

    • startup
    • front-end
    • back-end
    • ux/ui

    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
    www.appocados.com
    From / to
    since Feb 2023
    Tech-stack
    TypeScript, Svelte, Astro, MongoDB, Node.js, Apollo, GraphQL, Docker, Netlify, Keycloak, Matomo
    Tools
    Figma, GitLab, JIRA
    Client
    appocados
    in cooperation with
    Natascha Fadeeva
    Industry
    Food
    Team size
    2 team members
  • Screenshot of the project bettercode BID

    bettercode BID

    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, Material UI, Docker
    Tools
    Figma
    Client
    bettercodeLABS L.L.C-FC
    Industry
    Food
  • Screenshot of the project fluege.de

    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.

    Website
    go.fluege.de
    When
    Feb 2020 - Jun 2021
    Tech-stack
    Web Components, Lit, Polymer, Redux, Redux Saga
    Tools
    GitLab, JIRA, Swagger
    Client
    Invia Flights Germany GmbH
    Industry
    Travel
  • Screenshot of the project politischbilden.de

    politischbilden.de

    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.

    Website
    politischbilden.de
    When
    Jul 2019 - Feb 2020
    Tech-stack
    React, Gatsby, Redux, Node.js, Express, REST, GraphQL
    Tools
    Redmine, Swagger, GitLab
    Client
    Arbeitskreis deutscher Bildungsstätten e. V.
    in cooperation with
    robole - Kabisch & Wilmer GbRKnick Design - Müller, Schopf GbR
    Industry
    Education, Politics
    Team size
    4 team members
  • Screenshot of the project BMBF Client II

    BMBF Client II

    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.

    Website
    bmbf-client.de
    When
    Jan 2019 - Jun 2019
    Tech-stack
    Drupal, Mapbox
    Tools
    Redmine
    Client
    German Federal Ministry of Education and Research
    in cooperation with
    robole - Kabisch & Wilmer GbRKnick Design - Müller, Schopf GbR
    Industry
    Politics
    Team size
    4 team members
  • Screenshot of the project RIO

    RIO

    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.

    Website
    rio.cloud
    When
    Sep 2016 - Dec 2018
    Tech-stack
    React, Redux, Redux Saga, Bootstrap, Docker
    Tools
    GitLab, JIRA, Swagger
    Employer
    XPURE GmbH
    Client
    MAN Truck & Bus Deutschland GmbH
    Industry
    Logistics
    Team size
    8 team members
  • Screenshot of the project gridl

    gridl

    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.

    Website
    gridl.js.org
    From / to
    since Jan 2018
    Tech-stack
    TypeScript, Jest, Rollup
    Industry
    Software

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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.

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