Jack Tomaszewski

Tech Lead

Led a 10 person team building a part of the biggest e-commerce website in Poland - Allegro Lokalnie (8 mln unique visitors weekly).

• Mentored engineers. Conducted recruitment interviews, performance evaluations, salary reviews.
• Actively improved other teams and helped establish new practices. (Reduced on duty alerts to near zero. Reduced infrastructure costs by 40%. Split most of the project into separate responsibilities, so that they get assigned to individual teams.)
• Migrated front-end from legacy Elixir code to an internal low-code framework.

Senior Software Engineer

Helped build an Australian property management and fintech platform that helps 100k+ property managers, landlors and renters work better, together.

• Worked on back-end (node.js micro-service architecture with a GraphQL federated gateway), front-end (TypeScript, React, React Native) and DevOps (created CLI tool for deployment of Ailo micro-services to Kubernetes on AWS cloud).
• Helped with system design, took active part in recruitment, established many code standards, and done a lot of mentoring.

Lead Software Engineer

Built a web platform for collaboration between doctors and patients.

• Coordinated work of front-end and back-end dev teams. Closely worked with the project manager and the product owners.
• Designed the system architecture. Bootstrapped front-end, back-end and DevOps work. (A HIPAA-compliant stack powered by AWS CDK.)

Senior Software Engineer

Led development of a new front-end for one of the biggest American companies in the hospitality and entertainment industry.

Senior Software Engineer

Worked on a SaaS ATS platform that helps recruiters manage their job offers and candidates.

• Led and coordinated the front-end team to move the front-end stack from AngularJS to Angular 2, TypeScript, Webpack, RxJS and Redux.
• Helped migrate the back-end (written in Elixir and Phoenix) from a monolith to separate umbrella apps based on an event-driven architecture.
• Developed and released a cross-platform mobile app. (in Ionic Framework for both Android and iOS)

Lead Software Engineer

Built an entire SaaS and marketplace platform, that allows to book and manage tourist tours and attractions all over the world.

• Created and launched a marketplace (in Ruby on Rails) allowing end-customers to browse tourist tours, their schedules and prices, and book them online under the Tripsomnia/Partner/Agent's branding.
• Created and launched a large Single Page Application (in React and Redux) that allows Partners to manage their offers, pricings, orders, customers and agents.
• Implemented custom JS widgets, that Partners can put on their own website in order to advertise and sell their tours directly.

Lead Software Engineer

Built and maintained a social platform, that lets users easily find the best music fests, organize their trip and personalize their festival experience.

• Created a responsive front-end web app. (in Ruby on Rails and AngularJS)
• Created a cross-platform mobile app. (in Ionic Framework for Android and iOS).
• Developed unit and end-to-end tests for both front-end and back-end.
• Wrote automatic synchronizations with remote APIs, that e.g. parse user's friendships, favourite music artists and festivals from multiple services. (e.g. Facebook, LastFM, Spotify)
• Developed a full-text search using Elasticsearch, with various filters and a custom suggestion system based on the user's own personal music taste.
• Maintained automatic horizontal scaling of the web servers' infrastracture using Chef.

Full-stack Software Engineer

• Created multiple web applications, participating in the whole process of their development: product design and estimation, code design and development, DevOps, UI/UX design, product launch and maintenance. (jtom.me/portfolio)
• Co-organized several tech meetups and conferences (e.g. Meet.js Summit, PolyConf, ng-poznan, AKAI).
• Gave copious tech talks. (On many local meetups, both locally and abroad; and also on a biggest Polish front-end conference, Meet.js Summit, twice.)
• As a part of the team, gained awairds in several hackatons and startup contests. (Poznan Startup Weekend 2012, Startup Poznan 2014, Poznan Startup Sprint)