Michal Mikolajczyk - Freelance Blockchain Developer for Hire

Founder & CEO

2017 - PRESENT

Viking Garage

Founded the startup, bootstrapping it for nine months and building a team of six people.
Released the product within the first three months.
Led development, with over 55k lines of open-source code.
Organized a conference that resulted in the formation of an open source blockchain IoT project.
Presented at three international conferences.
Expanded the reach of the project from Poland to Spain, Portugal, and Indonesia within eight months.

Technologies: Blockchain IoT

Lead Engineer

2018 - 2018

William Hill

Released a new product.
Led a team of developers.
Worked closely with QA and BA.
Developed performance benchmarks and improved on them.
Maintained, documented and released three applications in a corporate environment.

Technologies: JavaScript, React.js, Cloud Services

Senior Software Engineer

2016 - 2017

Maxwell Health

Worked consecutively on four teams, to date.
Coordinated work between different teams and team leaders.
Planned, scoped, and groomed tasks for teams and peers.
Developed front-end and back-end components.
Set up automated infrastructure (devops: Docker, Terraform).
Planned architecture.
Helped clarify peer communication.

Technologies: JavaScript, DevOps, PHP, Docker

Software Engineer

2012 - 2017

Trewebs

Architected and developed a new client-side web application for an existing, settled organization with hundreds of thousands of users interested in the fashion industry and indie art in Western (English) and Chinese territories (collaboration with UX designers and API engineers).
Architected and integrated six external databases into one system - a MongoDB/Elasticseach search engine for the Museum of Polish Jews.
Created an AngularJS client and a Node.js/SQL Server API for an event calendar app used internally by the Museum of Polish Jews.
Developed an AngularJS client for LimeSurvey, an open source survey CMS that exposed an RPC API for a national university (Warsaw School of Life Sciences).
Collaborated with UI/UX designers for the purpose of designing and subsequently developing responsive, holistic front-ends for Krytyka Polityczna (a major alternative journal) and Bankwatch (an IFI focused, international NGO).
Created and led a developer team, introducing Agile, Scrum, Kanban, behavior-driven design, and test-driven development methodologies into the workspace.
Collaborated as a Drupal developer on two subsequent projects for West Pomeranian Voivodship and Unizeto Technologies, integrating Drupal and Apache Solr.
Delivered a high-availability Drupal app and server environment for the Educational Research Institute (Ministry of Education); the project is being designed to allow registration of all Polish schools and also to provide Microsoft Excel (VBA) tools to aid teachers.
Delivered two Drupal CMS-based projects for the Warsaw City Council and the Warsaw Zoological Garden: Wild Bird Refuge and CITES Convention sites and HD multimedia.
Designed and created Apache Solr search algorithms, used to drive the UX of a 2013 international MatEXPO, an international construction site machinery convention.
Architected and developed a RESTful API for an iPhone app, fully cloud-based (Heroku and S3) and running in a continuous integration environment using Codeship.
Architected, designed in collaboration with UI/UX artists, and developed a responsive AngularJS web app aimed at mobile devices for London beauty therapists.
Delivered dozens of small and mid-sized custom Drupal CMS commercial projects.

Technologies: JavaScript, Node.js, AngularJS, MongoDB, Drupal CMS

Senior React Developer

2015 - 2016

Praesens (via Airnauts)

Developed a React/Redux app from the ground up.
Introduced state-of-the-art technology and stable technology into a new project.
Architected the app structure, including the front-end codebase, front-end API proxy and server, deployment pipeline, and CI.
Translated and/or reused components from a prototype version, which was based on the Middleman JS framework.
Worked alongside the CTO, introducing best practices, robust solutions, to all aspects of the app, from UI/UX to API communication and authentication.

Technologies: React, Redux, ES6, JavaScript, Webpack, Babel

Lead UI Developer

2015 - 2016

MarketMuse

Entered an existing startup, introduced effective solutions, and then took the role of UI team lead.
Improved the end product, placing the UI team ahead of the curve.
Introduced a standard, predictable release schedule, based on Git flow: Develop/Release/Production.
Built a highly effective team with specialized roles, allowing the members to gain complementary skills.
Introduced unit testing and E2E testing within a continuous integration environment.

Technologies: AngularJS, Git Flow, TDD, Scrum, Functional Programming

Software Developer

2014 - 2016

Metavaluate (via Toptal)

Upgraded a legacy app in terms of structure, performance, design, user interface, and experience.
Used separate threads in the browser to achieve non-blocking, heavy filtering, and sorting of large data sets.
Added models and controllers on the API through Sails.js.
Added a caching layer through Redis.
Added support for unit and E2E tests and provided multiple tests to be included in a CI environment.
Continued support for the project as consultant.

Technologies: JavaScript, AngularJS, Sails.js, MongoDB, Redis

Software Engineer

2014 - 2016

Airnauts

Architected and built a large AngularJS app used by hundreds of thousands of users every month, in English and Chinese.
Added support for different video and audio content providers.
Created a robust SEO solution, using lightweight web services and built with Go.
Provided configuration modules to the CMS, which allowed for the preparation of content to show in the client app.
Supported all modern devices, with multiple responsive break points.
Added integration with multiple social networking services, including several from China.
Added support for a recommendation service, through a light web service built with Go.

Technologies: JavaScript, AngularJS, Node.js, Go, Media

Software Engineer

2015 - 2015

Heffernans Insurance (via Toptal)

Architected a robust, reactive system.
Engineered a minimum viable product.
Designed multiple data- and workflow diagrams, and system architecture schemas.
Generated insurance certificates in PDF form, on demand, and saved the copies to S3.
Created a demo splash page.
Displayed the PDFs using Mozilla's PDF.js viewer.
Created two APIs, utilizing the facilities already in use by the end client, minimizing work on their side.
Designed and implemented data schemas, based on legal documents (insurance certificates).

Technologies: Node.js, Loopback, AngularJS, Heroku, PDF.js, PhantomJS, AWS S3

Software Engineer

2015 - 2015

June20 (via Toptal)

Built a library for other developers to use, based on AngularJS.
Created an E2E test environment, including automated testing on iOS devices.
Provided automated documentation, unit tests, and demos.
Manually wired up advanced AngularJS functionality with reusable components, to be used by other developers.
Created robust workflows using Gulp, Selenium, and Browsersync.
Configured infrastructure on AWS (EC2, S3, IAM).
Communicated with and shared data to the iOS app (in a hybrid app environment).
Created a continuous integration and deployment environment with Travis CI.
Created Slack integrations.

Technologies: JavaScript, AngularJS, Git, iOS, Appium, PHP

Software Engineer

2015 - 2015

Eyeadvise (via Toptal)

Improved and extended a legacy app consisting of several modules hosted on Google App Engine.
Fixed existing issues around the client app written in AngularJS. Added new, business-critical functionality.
Fixed issues around a simple Python API.
Created an E2E testing environment, connecting all the multiple modules and also external services.
Added E2E tests, created documentation, and supported the project through the development process.

Technologies: AngularJS, Python, Google App Engine, Facebook SDK

Web Developer

2007 - 2012

Freelance

Created simple HTML-based websites.
Designed simple websites.
Developed mid-sized projects for local councils.
Provided a dynamic map of investment areas with detailed information, editable through Drupal CMS.
Supported projects and clients until they reached maturity and became stable businesses.

Technologies: HTML, CSS, Drupal CMS

Researcher/Analyst

2007 - 2012

Engagement Intelligence

Analyzed 30+ viral and marketing campaigns.
Performed analyses in international (English) and Scandinavian (Norwegian and Danish) territories.
Researched key users who have the most influence in their respective networks.
Worked on a variety of campaigns from entertainment (mainstream games and movies) to advanced technology projects (Windows Vista OS, Microsoft Dynamics, ASP.Net).
Chosen as employee of the month; delivered projects for Microsoft, Sony, Columbia Pictures, Nokia, O2, and Lionsgate among others.

Clinical Neuropsychologist

2010 - 2011

Institute of Psychiatry and Neurology, 2nd Department of Neurology

Designed a quantitative, clinical study based on empirical preapprehension and literature.
Chose adequate clinical and scientific methodology.
Carried out clinical and scientific research parallel to clinical duties.
Analyzed and measured data using chosen, sound statistical tools under supervision from a senior scientific employee.
Delivered a complete scientific study.

Technologies: Google Scholar, Data Science, Statistics, SPSS

Professional Development and Training (Other amazing things)

Completed several online courses in technology.

BerkeleyX (XSeries Big Data Courses, 2015)
- Introduction to Big Data with Apache Spark
- Scalable Machine Learning

BerkeleyX (Certificate Courses, 2012-2013)
- Artificial Intelligence, Part 1
- Software as a Service, Part 1
- Software as a Service, Part 2

EdX (2012-2013)
- MongoDB for Python Developers
- MongoDB for Node.js Developers

Speaker at Nomad City Conference (Other amazing things)

https://www.youtube.com/watch?v=MA70On5pzyE

Invited to give a speech at Nomad City Conference in Las Palmas de Gran Canaria, December 2016

Toptal Community Leader in Warsaw, Poland (2015~) (Other amazing things)

https://www.toptal.com/leaders

Helped build the Toptal Community in Poland. Organized 10+ gatherings for the community in Warsaw, including two conferences. Attended Toptal gatherings in other countries. Stays in constant communication with several other leaders.

Webby Nominee 2015 (Other amazing things)

2015 Webby awards nominee for Nowness.com.

Pixel Awards Winner + People's Choice Award Winner 2015 (Other amazing things)

2015 Pixel Awards winner and People's Choice Award winner in Arts & Culture - Nowness.com

AngularJS State/URL Decouplement (Other amazing things)

http://stackoverflow.com/questions/23585065/angularjs-ui-router-change-url-without-reloading-state/24835569#24835569

An invention allowing developers to change the URL without reloading the state using an AngularJS UI router.

High-availability Drupal App/Server + Aid Tools (Development)

http://eduentuzjasci.pl/

Delivered a high-availability Drupal app and server environment for the Educational Research Institute (Ministry of Education); the project was designed to allow registration of all Polish schools and also provide Microsoft Excel (VBA) tools to aid teachers.

LimeSurvey AngularJS Interface (Development)

An AngularJS client for LimeSurvey, an open source survey CMS that exposed an RPC API, for a national university (Warsaw School of Life Sciences).

The Vital Guide to React.js Interviewing (Other amazing things)

https://www.toptal.com/react#hiring-guide

Article on Toptal Resources, 600+ likes.

AngularJS Develop Job Description Template (Other amazing things)

https://www.toptal.com/angular-js/job-description

Job Template for AngularJS on Toptal Resources.

The Vital Guide to AngularJS Interviewing (Other amazing things)

https://www.toptal.com/angular-js#hiring-guide

Article on Toptal Resources.

11 Essential AngularJS Interview Questions (Other amazing things)

https://www.toptal.com/angular-js/interview-questions

Article on Toptal Resources.

The 9 Most Common Mistakes That Ionic Developers Make (Other amazing things)

https://www.toptal.com/ionic/most-common-ionic-development-mistakes

Assisted in writing the article for Toptal Blog.

The Vital Guide to Interviewing Ethereum Developers (Development)

https://www.toptal.com/ethereum#hiring-guide

The Ethereum and Solidity recruitment 101, main article under https://www.toptal.com/ethereum

Blockchain Development Guide (Development)

https://www.toptal.com/services/blockchain-development#guide

The introduction to understanding development on distributed ledger technologies

Blockchain, IoT, and the Future of Transportation: Understanding the Motoro Coin (Publication)

https://www.toptal.com/ethereum/motoro-iot-in-transportation

Open-source, IoT, and Ethereum smart contracts work together with a new utility coin to make transportation more accessible and reduce vehicle waste. In this article, Toptal Freelance Ethereum Developer Michał Mikolajczyk explains the motivations and methodology behind his startup's latest initiative.

Top 18 Most Common Mistakes that AngularJS Developers Make (Publication)

https://www.toptal.com/angular-js/top-18-most-common-angularjs-developer-mistakes

AngularJS is a very powerful framework. It is the third most starred repository on GitHub. It is not difficult to start using, but the goals that it is intended to accomplish demand comprehension. No longer can we ignore memory consumption, because it will not reset on navigation anymore. This is the vanguard of web development. Let’s embrace it!

Toptal Mentor

Michal is a mentor in the Toptal Global Mentor’s Program. This program is a partnership between Toptal and General Assembly to provide high quality mentorship for students from minority and low income backgrounds who are looking to begin their careers as professional software engineers. Michal shows commitment to diversity in tech by mentoring a General Assembly student every week for a year, covering everything from coding tips and tricks to advice on making it in the industry.

Languages

JavaScript, ECMAScript (ES6), HTML5, CSS3, Solidity, SQL, Go, Python, PHP

Frameworks

AngularJS, Jasmine, Ionic, Protractor, Express.js, Bootstrap 3, Linux OpenSuSe, Apache Spark, Flux, Redux, Sails.js, Loopback, Appium, PhoneGap, Cordova, Famo.us

Libraries/APIs

React, Selenium WebDriver, Node.js, jQuery, Moment.js, Restify, D3.js

Tools

Git flow, Git, Mocha, Gulp.js, Yeoman, Grunt, Webpack

Paradigms

Test-driven Development (TDD), Continuous Integration (CI), Continuous Deployment, Behavior-driven Development (BDD), Scrum, Agile Software Development, Data Science, DevOps, Kanban, Functional Programming, Extreme programming, Testing

Other

Communication, Task Automation, Task Flows, Open Source, Community, Coordination, System Architecture, Leadership, Bitcoin, Distributed Systems, ÐApp, ÐApps, Google Material Design, Team Leadership, Technical Leadership, Conference Speaking, Public Speaking, Team Management, Task Analysis, Task Scheduling, Big Data, Tech Conferences

Platforms

Ethereum, Linux, Debian Linux, CentOS, Blockchain, Amazon Web Services (AWS), iOS

Storage

Redis, PostgreSQL, MySQL, MongoDB, Elasticsearch

Master's degree in Neuropsychology

2005 - 2011

University of Warsaw - Warsaw, Poland