Jan Rösner Email and Phone Number

Founder & Writer: Built and scaled a niche micro-publishing platform & retrocomputing newsletter- Strategic Development: Spearheaded the creation of a micro-publishing platform tailored to our own needs for 8bitnews.io - Technical Leadership: Co-engineered a JAM stack based micro-publishing platform, using latest web development practices - Marketing Acumen: Developed persona-driven ad campaigns aimed at kick-starting customer acquisition including marketing asset- and presentation-design - Writing: Writing and publishing the newsletter bi-weekly including the creation of all necessary materials

Co-Founding & Development: Engineered an advanced analytics tool for Mailchimp- UX/UI Design: Spearheaded the user experience design of a comprehensive Electron application, ensuring intuitive navigation, and facilitating quick insights for Mailchimp users- Product Design: Conceived and integrated 80+ distinct metrics and time series, providing detailed analytics for growth, engagement, and user behavior - Data Analysis: Authored all SQL queries and necessary code underpinning the application's data retrieval and analysis mechanisms, ensuring accurate and performant metric computation - Online Marketing: Led the design and visual development of the application's website and ad campaigns, crafting a cohesive brand image and ensuring seamless user onboarding - Asset Production: Developed an array of digital assets, ranging from promotional materials to application icons, reinforcing the brand's identity and vision

Digital Strategy Consulting: Pioneered top-tier digital transformations globally- Strategic Leadership: Joined and led studies aimed at devising and implementing digital strategies for several of the top 50 global companies, resulting in improved business processes and competitive advantage - Team Management: Assembled and directed cross-functional teams to develop and deploy digital applications, ensuring alignment with client objectives and seamless integration into existing systems - Technical Expertise: Engaged in hands-on software development and DevOps activities for specific projects, leveraging technical expertise to ensure solutions met the highest standards of quality and efficiency - Stakeholder Management: Conducted in-depth stakeholder consultations, translating complex technical details into actionable business insights and guiding decision-making at the highest levels of client organizations - Boardroom Relations: Regularly presented in boardrooms, effectively communicating the strategic value and technical intricacies of digital initiatives, and winning support for project roadmaps and investments - Executive Steering: Established strong relationships with C-level executives, facilitating ongoing discussions about digital transformation and its impact on business outcomes - Collaborative Integration: Worked collaboratively with other McKinsey teams to integrate digital application strategies with broader business objectives, ensuring a holistic approach to client challenges - Trend Monitoring: Continuously monitored the global digital landscape, identifying emerging trends and technologies, and advised clients on potential opportunities and threats

Technical Leading: Steered complex software development for iconic brands- Technical Guidance: Acted as a primary technical point of reference within a team of software developers, guiding them through complex development tasks and ensuring adherence to best practices - Project Contributions: Contributed to relaunches of MTV, VIVA and Nickelodeon for various North European countries - Stakeholder Collaboration: Collaborated closely with stakeholders to ensure alignment of development activities with overarching business objectives - Quality Oversight: Played a pivotal role in code reviews, ensuring high-quality software output and mentoring junior team members for improved coding practices - Technical Mentorship: Led by example, demonstrating high proficiency in Ruby / Rails / Javascript, and regularly taking on the most challenging development tasks - Team Communication: Facilitated open communication within the team, ensuring concerns were addressed, and fostering an environment conducive to knowledge sharing and continuous learning - Architecture Contributions: Contributed actively to software design and architecture discussions, ensuring that solutions were scalable, maintainable, and met business needs - Planning Assistance: Assisted in the planning and estimation of software development tasks, providing insights based on past experience and technical expertise - Cross-functional Collaboration: Collaborated with cross-functional teams, including QA, Product Management, and Design, to ensure timely and quality software releases

Software Architecture & Development: Built an autonomous trading systems for Amazon listings- System Design: Planned, designed, and seamlessly integrated various event-driven technologies to produce a robust, autonomous trading platform - Software Development: Engineered a real-time application dedicated to executing fully automated trading operations on Amazon listings, enhancing efficiency and scalability

Founding & Development: Revolutionized german VAT declarations with a user-centric application- User-Centric Design: Developed "kassomat", a streamlined VAT declaration tool tailored for freelancers, reducing the filing process to just 1 minute - Full-stack Development: Engineered a responsive single-page application, integrating a Ruby on Rails backend and various services, all served via a RESTful API - Financial Management: Successfully secured funding to cover the entire development cycle, ensuring sustainability and project continuity

UI/UX Design: Crafted next-gen web components for Toyota's digital experience- UX Implementation: Designed and crafted user interfaces in line with Toyota's new CSS3 UX/UI style guide - Web Components: Engineered responsive web components utilizing the latest in HTML5 and CSS2/3 standards - Interactive Enhancements: Delivered custom JavaScript components designed to elevate and enrich the user experience, compliant with Toyota's style guide and easy to integrate

Lead Development: Set new development standards with a robust mobile platform and API- Mobile Web Development: Spearheaded the creation of a mobile platform utilizing Ruby on Rails full-stack, setting a new standard for in-house development - API Design: Conceptualized, designed, and developed a comprehensive RESTful API, ensuring seamless integration for the new mobile platform - Performance Optimization: Crafted a high-performance JavaScript single-page application, with special focus on ensuring optimal performance under high-traffic conditions

Mentoring & Development: Uplifted the tech framework with Rails expertise and team guidance- Technical Leadership: Championed the adoption and implementation of Ruby on Rails, driving full-stack platform development and setting new standards for the company's technical framework - Team Mentoring: Worked closely with a cross-functional team, mentoring in tools like Git, Ruby on Rails and others, and ensuring collaborative and seamless application development

Founding & Development: Revolutionized freight exchange with a specialized platform- Startup Leadership: Co-founded and steered shipbids.de, establishing it as a formidable competitor in the freight exchange marketplace domain - Platform Design: Single-handedly architected, designed, and developed the comprehensive platform using Ruby on Rails and JavaScript, encompassing a spectrum of services tailored to the industry's needs - Holistic Management: Oversaw all facets from strategic planning to operations, driving consistent growth and iterative feature enhancement over a span of nearly five years - End-to-End Responsibility: Managed the entire development lifecycle, from initial design sketches and feature ideation to testing, deployment, and DevOps, ensuring a seamless and user-centric experience

Web Development: Innovated API solutions and championed open-source testing tools for developers- API Development: Skillfully crafted a robust RESTful API using Ruby on Rails, enhancing server-client communication and facilitating seamless data transactions - Tool Creation: Pioneered an automated API testing tool tailored to the platform's unique needs, later packaging and sharing this solution with the broader development community as a Ruby Gem

Co-founding & Development: Pioneered a lasting, niche-leading e-commerce platform- Platform Design: Spearheaded the full-stack development of a market-leading e-commerce platform using Ruby on Rails and JavaScript, driving its growth and relevance until the current day - Feature Development: Strategized and implemented e-commerce functionalities, including sophisticated inventory management systems and robust CRM features - Technical Leadership: Assumed overarching responsibility for all technical aspects, ensuring the platform's longevity, security, and adaptability to evolving market needs - Lifecycle Management: Regularly updated and extended the platform's capabilities, solidifying its position as a market leader in its niche through continuous technological innovation - Operational Excellence: Handled a gamut of DevOps tasks, ensuring seamless deployment, consistent uptime, and optimal platform performance over the years

Lead Development: Established X.509 based digital signature & encryption in the e-health sector- Software Leadership: Directed the development and implementation of modern software components, emphasizing digital signature and military-grade encryption - Hardware Development: Integrated advanced security solutions using smartcards and hardware security modules (HSM's), ensuring robust protection for sensitive health sector data - Product Marketing: Transitioned seamlessly into a product marketing role, championing the promotion and adoption of the meticulously developed software components, marrying technical know-how with market strategy - Key Accounting: Managed critical client projects within the health sector, striking a balance between technical prowess and client needs to deliver top-tier X.509 PKI solutions

International Marketing: Expanded global reach and built key partnerships- Global Marketing: Spearheaded international sales operations, adapting strategies to resonate with diverse markets - Relationship Building: Forged and nurtured pivotal relationships with international clients and partners, laying the foundation for potential collaborations and expansions

Research & Development: Supported genetic discoveries with tailored web tech- Research Aid: Contributed as a student assistant, playing a role in genetic research using Perl programming of BLAST algorithms - Web Development: Engineered tailored web applications in PERL that met intricate research requirements, aiding scientists globally in decoding the genome of Arabidopsis thaliana

Print Post-Production: Ensured quality in large scale print environment- Digital Printing: Played a role as a post-production student assistant, ensuring precision in various large scale printing tasks - Quality Assurance: Upheld the highest standards of printed materials, consistently delivering premium outputs within set timelines