Krzysztof Czernek, Full-stack Developer in Kraków, Poland
Krzysztof Czernek

Full-stack Developer in Kraków, Poland

Member since September 17, 2017
Krzysztof is a full-stack developer with several years of experience collaborating directly with startup founders and CEOs to bring their ideas to life and work on projects for Fortune 500 companies. He is passionate about lean product development and consulting. Thanks to his technical expertise, business focus, and ability to communicate in a clear and reasoned fashion, Krzysztof is a great partner to brainstorm ideas and deliver incredible products.
Krzysztof is now available for hire

Portfolio

  • Iterate Labs (via Toptal)
    Google Chrome, JetBrains, MacOS, REST, Lean Startups, Business Requirements...
  • u2i
    Google Chrome, JetBrains, HIPAA Compliance, Functional Programming, MacOS...
  • Smart4Aviation
    Problem Solving, Algorithms, Java

Experience

Location

Kraków, Poland

Availability

Part-time

Preferred Environment

Amazon Web Services (AWS), Zoom, Slack, Google Chrome, AWS, JetBrains, GitHub, Git, Bash, MacOS

The most amazing...

...algorithm I've created analyzed meteorological phenomena areas and their impact on flight routes.

Employment

  • Lead Software Engineer

    2020 - 2020
    Iterate Labs (via Toptal)
    • Maintained, improved, and scaled AWS-based infrastructure for real-time IoT data processing system (1000s of events per second).
    • Designed and conducted end-to-end tests of the full data pipeline prior to production release.
    • Implemented and deployed admin application for end-users and back-office administration of the system.
    • Implemented monitoring, alerting, data retention policies, and performance improvements across critical systems.
    • Collaborated with the in-house Data Science team on integrating data processing models into the system.
    Technologies: Google Chrome, JetBrains, MacOS, REST, Lean Startups, Business Requirements, Team Leadership, System Architecture, IT Consulting, Problem Solving, ECMAScript (ES6), Consulting, Lean Product Development, Technical Leadership, APIs, GitHub, Algorithms, AWS Kinesis, AWS Lambda, Ruby on Rails 5, AWS RDS, AWS S3, AWS EC2, Ruby, Bash, Software Consulting, Agile Software Development, Agile, Git, Amazon Web Services (AWS), Full-stack, AWS, Kubernetes, Docker, PostgreSQL, SQL, JavaScript, React, Ruby on Rails (RoR)
  • Tech Lead | Full-stack Developer | Consultant

    2013 - 2020
    u2i
    • Maintained a mobile app, developed a data processing pipeline and helped with data migration from on-premise to the cloud in a healthcare institution.
    • Created a service for correlating data from disparate sources with a reference database of hundreds of millions of records.
    • Worked directly with a founder to take their idea from conception to a working prototype.
    • Created a collaborative platform for municipal governments from the ground up while working directly with a startup's CEO.
    • Helped multiple clients refine their ideas and come up with plans for prototypes and MVPs.
    • Advised clients on technology, product development, and lean practices.
    • Helped find new clients, took an active part in early sales interactions and contributed to writing proposals.
    • Ran workshops on JavaScript and functional programming, organized hackathons.
    • Helped design and implement the recruitment process for junior/mid/senior developers, conducted interviews.
    • Helped streamline the transition to remote work, developed internal tools, and improved internal processes.
    Technologies: Google Chrome, JetBrains, HIPAA Compliance, Functional Programming, MacOS, REST, Business Consulting, Semantic UI, Lean Startups, Business Requirements, Team Leadership, System Architecture, IT Consulting, Problem Solving, ECMAScript (ES6), Consulting, Lean Product Development, Technical Leadership, APIs, GitHub, Algorithms, React Native, PostgreSQL, AWS Lambda, RxJS, TypeScript, AWS RDS, AWS S3, AWS EC2, MySQL, Bash, Software Consulting, Express.js, Redux, Agile Software Development, Agile, Amazon Web Services (AWS), Full-stack, Git, AWS, Terraform, Docker, SQL, Flask, Ruby on Rails (RoR), Node.js, React, Python, Ruby, JavaScript
  • Software Engineer Intern

    2013 - 2013
    Smart4Aviation
    • Worked on algorithmic solutions to area-related problems.
    • Analyzed meteorological phenomena and their impact on flight routes.
    • Mentioned in an errata for finding a mathematical mistake in "Some Algorithms for Polygons on a Sphere" by Robert G. Chamberlain and William H. Duquette (NASA Jet Propulsion Laboratory).
    Technologies: Problem Solving, Algorithms, Java
  • Software Engineer

    2013 - 2013
    Schibsted Tech Polska
    • Built an iPhone application for sports statistics from the ground up, in two months, with no prior experience with iOS and Objective-C.
    Technologies: Google Chrome, JetBrains, MacOS, Problem Solving, APIs, GitHub, Bash, Agile Software Development, Agile, Git, SQL, Full-stack, Java, Objective-C

Experience

  • Data Processing Pipeline and Mobile App | Healthcare (Development)

    I handled the full-stack development of a data processing pipeline and maintenance of a cross-platform mobile app in the healthcare space along with the migration from on-premise to a cloud-based infrastructure.

    I took an active part in all stages of the project: from proposals and defining requirements to technical strategy planning and hands-on full-stack development. I also worked in a team of four developers for over a year.

    • Client's review: https://clutch.co/profile/u2i#review-1392252

    Technologies: Python, JavaScript, Flask, Apache Airflow, React Native, React, Docker, Terraform, AWS

  • Data-matching Service (Development)

    A service for correlating data from disparate sources with a reference database of hundreds of millions of records, heavily utilizing string similarity algorithms. This is a mission-critical system that's been running in production for over two years now with minimal maintenance and support required.

    I handled the full-stack development and architecture design from the ground up. I worked in a team of two developers for nine months.

    Technologies: Ruby, Ruby on Rails, MySQL, Terraform, Chef, Capistrano

  • Citymart Opportunity Builder (Development)

    A collaborative platform for municipal governments to streamline and improve procurement processes.

    I handled the full-stack development and architecture design from the ground up and for two years, I worked in a team of 2-4 developers.

    • Review: https://clutch.co/profile/u2i#review-409571

    Technologies: JavaScript, React, Redux, RxJS, Webpack, Jest, Node.js, Python, Flask, PostgreSQL, Docker, Terraform, AWS

  • Personal Knowledge Management System (Development)

    A prototype for a personal knowledge management system to help business people better manage their information.

    I handled the full-stack development and architecture design from the ground up. I worked in a team of two developers for six months.

    Review: https://clutch.co/profile/u2i#review-764612

    Technologies: JavaScript, TypeScript, React, Redux, RxJS, Webpack, Jest, Node.js, Neo4j, Docker

  • Articles on Functional Programming in JavaScript (Other amazing things)

    A series of articles on functional programming in JavaScript. It was published in DailyJS at Medium.

  • Articles on Consulting and Lean for Software Developers (Other amazing things)
    https://hackernoon.com/@krzysztof.czernek

    A series of articles on Consulting and Lean for Software Developers. It was published in Hacker Noon at Medium.

Skills

  • Languages

    JavaScript, ECMAScript (ES6), SQL, TypeScript, Bash, Ruby, Objective-C, Java, Python
  • Frameworks

    Redux, Express.js, Material-UI, Jest, Ruby on Rails 5, Ruby on Rails (RoR), React Native, Flask
  • Libraries/APIs

    Node.js, React, RxJS
  • Tools

    GitHub, Git, Terraform, JetBrains
  • Paradigms

    Agile, Agile Software Development, REST, Functional Programming, HIPAA Compliance
  • Platforms

    Amazon Web Services (AWS), Docker, AWS EC2, AWS Lambda, MacOS, AWS Kinesis, Kubernetes
  • Storage

    AWS S3, PostgreSQL, MySQL, AWS RDS
  • Other

    Technical Leadership, Full-stack, APIs, Lean Product Development, Consulting, AWS, Software Consulting, Team Leadership, System Architecture, Business Requirements, Algorithms, Lean Startups, IT Consulting, Business Consulting, Semantic UI, Problem Solving

Education

  • Bachelor of Engineering degree in Computer Science
    2011 - 2015
    AGH University of Science and Technology - Kraków, Poland

To view more profiles

Join Toptal
Share it with others