Thomas is available for hire
Hire ThomasThomas Jansen
Verified Expert in Engineering
Technology Leader and Developer
Einbeck, Lower Saxony, Germany
Toptal member since December 4, 2020
Bio
Thomas is a technology executive, product leader, and engineer with over a decade of experience. He works as a lead engineer, solution architect, and full-stack developer. Previously, he led various development organizations and helped to build and scale various international technology startups. Thomas creates exceptional end-user experiences with a strong focus on UX, helps others advance, and continuously expands his technology repertoire.
Portfolio
Mobeus Industries, INC.
Angular, JavaScript, TypeScript, React, Electron, HTML, CSS, AWS Amplify...
US Healthcare SaaS (Toptal Projects)
GraphQL, Node.js, Express.js, Prisma, Apollo Server, React, Create React App...
Spontaneousli (Toptal)
JavaScript, Slack API, Slackbot, Slack App, Node.js, Videos, Glitch, HTML, CSS...
Experience
- API Integration - 10 years
- Node.js - 8 years
- JavaScript - 8 years
- Product Management - 8 years
- AngularJS - 6 years
- Electron - 3 years
- React - 2 years
- Vue - 1 year
Availability
Part-time
Preferred Environment
Visual Studio Code (VS Code), OS X, Git
The most amazing...
...project I've worked on was a new time recording application where we could save over €5 million per year with an improved user experience.
Work Experience
Head of Engineering
2022 - 2023
Mobeus Industries, INC.
- Developed a communication application that allows people to have video conferences, such as Zoom or Microsoft Teams, while still being able to view their desktop behind their video feeds transparently, including a hand gesture feature to control the app.
- Joined the company full-time as the head of engineering, overseeing all engineering, architecture, infrastructure, and product management after working as a developer working on the front end, back end, and infrastructure.
- Managed the engineering team of 30 employees, including QAs, PMs, architecture, and web and native library development. Delivered training programs for developers on test automation and infrastructure automation.
- Tasked with the end-to-end software development process and the release of new product versions of Airglass.
Technologies: Angular, JavaScript, TypeScript, React, Electron, HTML, CSS, AWS Amplify, AWS Cloud Development Kit (CDK), Amazon Cognito, AngularJS, Node.js, CI/CD Pipelines, Test-driven Development (TDD), Databases, People Management, Project Management, Git, Agile, Startups, DevOps, API Integration, Full-stack, Architecture, Continuous Integration (CI), Leadership, GraphQL, WebRTC, Amazon Web Services (AWS), Amazon S3 (AWS S3), Videos, SaaS, Cloud, Cloudflare, Amazon DynamoDB, AWS AppSync, Software Development Management, B2B, Engineering, CTO, Cloud Architecture, Delivery Management, Engineering Management, Agile Project Management, Team Management, Team Leadership, IT Management, Solution Architecture, Software Architecture, Agile Software Development, Database Architecture, Web Platforms, Software Engineering, Web Development, Software Design, Serverless Architecture, Amazon Cognito User Pools, AWS CloudFormation, AWS Lambda, Lambda Functions, Serverless, Front-end Development, Cloud Platforms, Next.js, JavaScript Testing, Jira, Figma, Responsive Web Apps, Front-end, Responsive Web Design (RWD), HTML5, CSS3, WCAG 2
Engineering Lead and Full-stack Developer
2022 - 2022
US Healthcare SaaS (Toptal Projects)
- Led the engineering for one of the biggest Toptal projects so far.
- Defined the technology stack for a new medical healthcare SaaS product for the US combining EMR, PM, and medical billing.
- Led the front-end development using React, TypeScript, and Tailwind CSS and back-end development using Node.js, Express.js, and Apollo.
- Assisted with effort estimation, roadmap creation, and integration of third-party solutions, as well as their technical evaluation.
- Supported hiring of new talents, onboarding, and scaling the team.
Technologies: GraphQL, Node.js, Express.js, Prisma, Apollo Server, React, Create React App, Tailwind CSS, Auth0, Apollo Client, Redux, TypeScript, JavaScript, User Experience (UX), User Interface (UI), HTML, CSS, Apollo, Architecture, Startups, Leadership, Software Development Management, Engineering, Cloud Architecture, Engineering Management, Agile Project Management, Team Management, Team Leadership, Solution Architecture, Software Architecture, Agile Software Development, Database Architecture, Web Platforms, Software Engineering, Web Development, Software Design, Serverless Architecture, Amazon Cognito User Pools, Front-end Development, Cloud Platforms, Next.js, JavaScript Testing, Jira, Figma, Responsive Web Apps, Front-end, Responsive Web Design (RWD), HTML5, CSS3
Full-stack Developer
2021 - 2021
Spontaneousli (Toptal)
- Developed a Slack app to make random ad-hoc video calls with colleagues.
- Evaluated new product ideas and created prototypes.
- Supported the app with effort estimations and high-level roadmap creation.
Technologies: JavaScript, Slack API, Slackbot, Slack App, Node.js, Videos, Glitch, HTML, CSS, Architecture, Startups, Engineering, Cloud Architecture, Agile Project Management, Solution Architecture, Software Architecture, Agile Software Development, Database Architecture, Software Engineering, Web Development, Software Design, Serverless Architecture, Front-end Development, Cloud Platforms, JavaScript Testing, Jira, Figma, Responsive Web Apps, Front-end, Responsive Web Design (RWD), HTML5, CSS3
Solution Architect, Team and Infrastructure Lead
2021 - 2021
Bitus Labs (2 Toptal Projects)
- Defined the architecture for two projects to launch a decentralized crypto exchange platform for leveraged trading.
- Set up the infrastructure on AWS (S3, CloudFront, ECR, ECS, and Aurora) and a CI/CD pipeline using GitHub Actions.
- Oversaw the technical development of both platforms and coordinated and aligned both development teams.
- Assisted with effort estimates and internal and external hiring and staffing of developers for the projects.
Technologies: Amazon Web Services (AWS), React, Tailwind CSS, Blockchain, Amazon Aurora, AWS Elastic Beanstalk, Ethers.js, PostgreSQL, Amazon CloudFront CDN, Amazon S3 (AWS S3), Amazon Elastic Container Registry (ECR), CI/CD Pipelines, JavaScript, Node.js, Express.js, TypeScript, User Experience (UX), User Interface (UI), HTML, CSS, Architecture, Redux, Startups, Software Development Management, Engineering, Cloud Architecture, Agile Project Management, Team Management, Team Leadership, Solution Architecture, Software Architecture, Agile Software Development, Database Architecture, Web Platforms, Software Engineering, Web Development, Software Design, Crypto, Front-end Development, Cloud Platforms, JavaScript Testing, Jira, Figma, Amazon RDS, Responsive Web Apps, Front-end, Responsive Web Design (RWD), HTML5, CSS3
Founder and CTO
2021 - 2021
Patent Claim Editor
- Implemented an Electron-based offline editor to reduce the manual effort for patent attorneys when drafting patent claims.
- Generated word documents automatically with detection of document changes.
- Oversaw development, launch, and sales of the new product.
Technologies: Node.js, Vue, Electron, JavaScript, Express.js, User Experience (UX), User Interface (UI), HTML, CSS, Architecture, Tailwind CSS, Engineering, CTO, Cloud Architecture, Delivery Management, Engineering Management, Agile Project Management, Solution Architecture, Software Architecture, Agile Software Development, Database Architecture, Software Engineering, Web Development, Software Design, Front-end Development, Cloud Platforms, JavaScript Testing, Front-end, Responsive Web Design (RWD), HTML5, CSS3
Co-founder & CTO
2020 - 2021
Million Ventures
- Co-founded a venture builder to create new digital ventures.
- Advised startups in the developer and productivity tools space.
- Created a custom eCommerce shop using Shopify and automated fulfillment processes using the Shopify API.
Technologies: Vuex, Architecture, Technical Leadership, Stripe, API Integration, Shopify API, Shopify, Puppeteer, Firebase, Google Cloud Platform (GCP), SQL, JavaScript, CSS, HTML, DevOps, Startups, Electron, Express.js, Vue, Node.js, eCommerce, User Interface (UI), Engineering, CTO, Cloud Architecture, Engineering Management, Agile Project Management, Team Leadership, Solution Architecture, Software Architecture, Agile Software Development, Software Engineering, Web Development, Software Design, Front-end Development, Cloud Platforms, Jest, JavaScript Testing, Jira, Front-end, Responsive Web Design (RWD), HTML5, CSS3
Engineering Manager
2018 - 2019
SAP
- Improved existing CI/CD services across SAP, including source code management, artifact management, CI/CD infrastructure services, licensing scans, security scans, and quality scans.
- Managed the developer and quality tools teams responsible for internal services to increase development productivity and fulfill corporate requirements.
- Defined the overall vision and mission for the department.
- Hired new employees and supported and coached team members in their personal and professional development.
Technologies: Docker, APIs, CSS, JavaScript, HTML, NestJS, GraphQL, Microservices Architecture, REST APIs, Full-stack, NoSQL, API Integration, Architecture, Leadership, Continuous Integration (CI), CI/CD Pipelines, API Gateways, API Management, Google Cloud Platform (GCP), AngularJS, Angular, Express.js, MongoDB, Node.js, Project Management, People Management, Product Management, Amazon Web Services (AWS), GitHub API, SAP, Software Development Management, B2B, Engineering, Cloud Architecture, Delivery Management, Engineering Management, Agile Project Management, Team Management, Team Leadership, IT Management, Solution Architecture, Software Architecture, Agile Software Development, Web Platforms, Software Engineering, Web Development, Software Design, Front-end Development, Cloud Platforms, Jest, Mocha, JavaScript Testing, Jira, Webhooks, Business Architecture, Enterprise Architecture, Front-end, Responsive Web Design (RWD), HTML5, CSS3, WCAG 2
Product Manager
2012 - 2018
SAP
- Enabled and scaled new development services such as GitHub and Slack for over 20,000 developers.
- Collaborated with external vendors, performed due diligence, and coordinated between various departments such as legal, security, data protection, and purchasing.
- Promoted open-source practices for development and released an open-source project to handle contributor license agreements.
- Managed the product development of internal services, from discovery to delivery and operations.
- Organized a worldwide training program for Git and GitHub.
- Selected for outstanding contribution and strategic thinking as part of the company-wide catalyst program.
Technologies: Microservices Architecture, Technical Leadership, Architecture, Express.js, APIs, NoSQL, Google Cloud Platform (GCP), Passport.js, CSS, HTML, REST APIs, API Integration, JavaScript, Angular, CI/CD Pipelines, Slack API, GitHub, Docker, MongoDB, AngularJS, Node.js, Amazon Web Services (AWS), GitHub API, SAP, B2B, Engineering, Agile Project Management, IT Management, Solution Architecture, Software Architecture, Agile Software Development, Software Engineering, Web Development, Software Design, Front-end Development, Cloud Platforms, Jest, Mocha, JavaScript Testing, Jira, Webhooks, Business Architecture, Enterprise Architecture, Front-end, Responsive Web Design (RWD), HTML5, CSS3
Software Engineer
2010 - 2012
SAP
- Developed a system to localize defects faster, significantly reducing the time and effort spent on root cause analysis.
- Published patent EP2960799A1 on the localization of defects in software integration tests.
- Built an integration to create support tickets from running applications while automatically capturing application runtime information.
- Was recognized for exceptional contribution and great potential as part of the company-wide talent program.
Technologies: REST APIs, API Integration, SQL, Full-stack, APIs, CSS, HTML, Defect Management, Patent Applications, ABAP, JavaScript, Algorithms, Agile, SAP, B2B, Engineering, Software Architecture, Agile Software Development, Software Engineering, Web Development, Front-end Development, Jest, Mocha, Google Maps, Maps, JavaScript Testing, Jira, Webhooks, Business Architecture, Enterprise Architecture, Responsive Web Design (RWD), HTML5, CSS3
Software Engineer
2007 - 2010
SAP
- Implemented data aggregation methods to speed up the processing of financial transactions.
- Designed and implemented an enhanced versioned storage system for financial transactions.
- Introduced an automated testing framework for the inbound processing of financial transactions.
- Supported the writing of new specification documents for the upcoming release of the product.
- Organized and conducted internal workshops for efficient programming, test-driven development, and Agile development methods.
Technologies: API Integration, Design Patterns, Data Structures, APIs, Databases, Agile, Test-driven Development (TDD), ABAP, SAP, B2B, Engineering, Agile Software Development, Software Engineering, Web Development, Jira, Business Architecture, Enterprise Architecture
Experience
Airglass
https://airglass.com/A video conferencing application to enable a unified reality experience. Connect, share, and collaborate in a frictionless telepresence experience that combines live video and content.
Healthcare SaaS
A healthcare SaaS solution that includes integrations to third-party vendors for tests, prescriptions, payments, etc., to simplify the complex billing process used in the US for submitting insurance claims.
Patent Claim Editor
An offline editing application for patent attorneys to efficiently create and amend patent claims. The application automatically updates all claim references while editing. It also manages part names and generates full word documents with proper change tracking.
Spontaneousli
A Slack app to connect co-workers with other co-workers for on-demand video meetings. Select up to 4-time slots that normally work for you daily and get randomly paired for a video call with a new colleague daily.
Education
2006 - 2007
Master's Degree in Computer Science
University of Saarland - Saarbrücken, Germany
2003 - 2006
Bachelor's Degree in Computer Science
University of Saarland - Saarbrücken, Germany
Certifications
MAY 2022 - PRESENT
Toptal React Accelerator Graduate
Toptal, LLC
Skills
Libraries/APIs
Node.js, Vue, Vuex, Slack API, GitHub API, REST APIs, React, Passport.js, WebRTC, Intercom API, Puppeteer, Shopify API, Stripe, Bolt, Apollo Client, AWS Amplify, Google Maps
Tools
GitHub, Slack, Jira, Git, SendGrid, AWS CloudFormation, Mocha, JavaScript Testing, Figma, Amazon CloudFront CDN, Amazon Elastic Container Registry (ECR), Prisma, Create React App, Auth0, AWS Cloud Development Kit (CDK), Amazon Cognito, AWS AppSync
Languages
JavaScript, ABAP, HTML, CSS, SQL, TypeScript, HTML5, CSS3, GraphQL
Frameworks
Express.js, Electron, AngularJS, Angular, Tailwind CSS, Redux, Jest, Next.js, NestJS
Paradigms
Test-driven Development (TDD), Agile, DevOps, Design Patterns, Continuous Integration (CI), Agile Project Management, Agile Software Development, Responsive Web Design (RWD), Microservices Architecture, B2B, Serverless Architecture, HIPAA Compliance
Platforms
Amazon Web Services (AWS), Docker, Google Cloud Platform (GCP), AWS Lambda, Firebase, Shopify, Heroku, Blockchain, AWS Elastic Beanstalk
Storage
Databases, Database Management Systems (DBMS), Database Architecture, MongoDB, NoSQL, Amazon S3 (AWS S3), Amazon Aurora, PostgreSQL, Amazon DynamoDB
Industry Expertise
Project Management
Other
Product Management, People Management, CI/CD Pipelines, Startups, Algorithms, Data Structures, API Integration, APIs, Full-stack, Architecture, Technical Leadership, Leadership, User Experience (UX), User Interface (UI), Cloud, SAP, Software Development Management, Engineering, Cloud Architecture, Delivery Management, Engineering Management, Team Management, Team Leadership, Solution Architecture, Software Architecture, Software Engineering, Web Development, Software Design, Front-end Development, Cloud Platforms, Front-end, Patent Applications, API Management, API Gateways, CTO, IT Management, Web Platforms, Amazon Cognito User Pools, Lambda Functions, Serverless, Crypto, Webhooks, Responsive Web Apps, Business Architecture, Enterprise Architecture, WCAG 2, Defect Management, eCommerce, Ethers.js, Apollo Server, Slackbot, Slack App, Videos, Glitch, Healthcare IT, SaaS, ICD-10, HIPAA Electronic Data Interchange (EDI), Billing, Apollo, Cloudflare, Maps, Amazon RDS
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