Experience
January 1, 2025 – Present
Delivery Manager
Cloudflight Germany GmbH, Karlsruhe
April 1, 2022 – December 31, 2024
Head of Product & Self Service Frontends
IONOS SE, Karlsruhe
Responsible for the technical implementation of various product management and self-service frontends, including the IONOS Control Panel and Data Center Designer.
- Led 5 teams (30 developers, 3 leaders) across 4 locations, building customer-facing frontends for Hosting & Cloud services.
- Shaped and implemented technical strategy in alignment with business needs.
- Enabled teams through mentoring, clear communication, and structured autonomy.
- Drove organizational development, process optimization, and technology alignment.
July 1, 2020 – March 31, 2022
Head of Customer Self Care Development
1&1 IONOS SE, Karlsruhe
Led the technical implementation of self-care frontends, particularly the IONOS Control Panel, using the exos frontend framework.
- Led a 10-person team responsible for the IONOS Control Panel and related services.
- Orchestrated the transition from a 20+ year old monolith to a modern Spring Boot-based architecture.
- Increased developer productivity and reduced time-to-market through pragmatic, incremental modernization.
April 1, 2019 – June 30, 2020
Head of Shop & App Development
internetstores GmbH, Stuttgart
Managed the development of over 30 online shops (e.g., fahrrad.de, Bikester) and mobile apps, overseeing the transition to Salesforce Commerce Cloud.
- Directed a 18-person department covering software development, QA, and UX.
- Oversaw technical development of 34 online shops (PHP/Symfony).
- Led migration to Salesforce Commerce Cloud with full budget ownership.
December 1, 2016 – March 31, 2019
Head of Apps & Frontend Services
1&1 IONOS SE, Karlsruhe
Managed the Control Panel and mobile apps, developed shared services like navigation bars and ad-serving systems, and supported customer satisfaction features.
February 1, 2015 – November 30, 2016
Senior Software Developer
1&1 Internet SE, Karlsruhe
Developed online shop and self-care systems, including the Website Checker and advertising systems for personalized product suggestions.
May 1, 2014 – January 31, 2015
Head of Frontend Platform
1&1 Internet AG, Karlsruhe
Led the development of CMS tools for managing online shop content and product information.
October 1, 2013 – April 30, 2014
Junior Software Developer
1&1 Internet AG, Karlsruhe
Built applications and services for 1&1 online shops and control panels, including ad-serving and domain suggestion services.
October 1, 2010 – September 30, 2013
Dual Study Program: Applied Computer Science (B.Sc.)
1&1 Internet AG, Karlsruhe
Completed dual study with alternating theoretical and practical phases focused on frontend and Java development in online shop teams.
Skills
Leadership & Management
- Engineering Management
- Agile & Project Management
- Organizational & Employee Development
- Resource & Budget Planning
- Mentoring & Team Empowerment
Technical Expertise
- Frontend Development (React, Vue, SASS, HTML, CSS, JavaScript)
- Backend Development (Java, Spring Boot, PHP)
- Dev Tooling (Webpack, Maven, NPM, PostCSS)
- Architecture & Technical Strategy
- Design Systems & Component Libraries
Sebastian Stöhr is an experienced Software Engineering Manager with over a decade in agile leadership, frontend development, and organizational transformation. He has led cross-functional teams at IONOS and internetstores, driving modernization initiatives, micro-frontend strategies, and scalable design systems. With deep expertise in Java, PHP, JavaScript, and modern frameworks like React and Spring Boot, Sebastian focuses on aligning technical strategy with business goals. Based in Karlsruhe, he empowers teams through mentoring, clear processes, and a strong product mindset. Reach out to collaborate on software engineering leadership, agile transformation, or frontend architecture.