Mentoring programmers with over 300 sessions completed. http://codementor.io/ambisoft

Ruby, Java, Javascript, PHP, Objective-C, TDD mentor

- re-design, implementation and ongoing maintenance of the customer-to-dealer system targeting the US used office furniture market, - development of websites for furniture dealers using a custom Dreamweaver-compliant framework, - implementation of content syndication tools based on Javascript/AJAX/Direct Web Remoting, - implementation of auxiliary tools in PHP/MySQL and Java/Swing for data processing

Software Developer

Software projects using different technologies, from low-level C-based development of modules for a SIP server, to PHP/perl/RoR web-oriented tasks, to complete J2EE-based solutions, to mobile apps for iPhone and Android. Defining requirements, negotiating, designing systems and implementing the defined solutions. Focusing on innovative and non-trivial problems to solve.

Owner

Django, ReactJS, BackboneJS, jasmine, PostgreSQL, TDD, whatever else it takes to move things forward.

Software Engineer

Responsibilities: frontend, backend, embeddable javascript widgets, native iOS app. Technologies: Ruby, Sinatra, Ruby on Rails, Backbone.js, D3.js, Objective-C, PostgreSQL, Cassandra, Storm, Amazon EC2

Development of new features for an online intelligent parking & commuting management platform. Technologies: Java/Spring, Scala/Lift, YUI, jQuery, Bootstrap, Amazon EC2 / S3, Selenium. Agile development model with weekly and biweekly milestones.

Design & implementation of Rails-based backend for SFHeroes (http://sfheroes.com) iphone app interactive Wired-like iPad app made for Applied Materials, showcasing the company and their offer, used during industry tradeshows

Contractor

Development of the supply chain planning module; technologies and libraries: Java 5, Oracle Toplink ORM, Struts, JUnit, MySQL, Oracle DB, DB2

Senior J2EE Developer

- implementation of the Admin section and the Billing subsystem (integration with TrustCommerce) in the Google/Overture AdWords testing tool (Perl/Catalyst/PostgreSQL), - automated code-testing framework creation.

- design, set-up and maintenance of the whole IT system, application of all standard team- development tools and practices, - website development - OO Perl, mod_perl 2.0, - database-level design & coding, - creation of tools for automatic data acquisition, validation and processing, - phpPgMyAdmin (Open Source PostgreSQL web interface) tweaking to fit the company's needs, - development of data-exchange tools - import/export to from XML/XLS/PDF formats, - implementation of a stand-alone portfolio desktop application (C++ / BerkeleyDB / Win32 API), - database (PostgreSQL), Apache (2.0), Qmail and Linux/FreeBSD servers administration

Software Developer and System Administrator

Implementation of a system for field sales reps. Technologies: C, C++, embedded devices, PSION palmtops, EPOCH OS

C Programmer

I know the language inside-out and I usually know how to patch existing libraries. Skilled at things like namespacing (and organizing code in general), prototypical inheritance, promises, closures, advanced DOM manipulation, AJAX, timeouts & intervals

Worked on a large enterprise SaaS codebase, which consisted of over 500 React.js components. I've used Backbone.js models , Flux, Redux and React Hooks to manage state of the app. I can help you with:
- understanding the "React Way" of organizing your app into components,
- designing component hierarchy that will represent your problem domain,
-  split components into container and presentation components to maximize performance,
- debug state-related errors,
- write tests at both unit and integration levels using frameworks like jest and jasmine 

Worked with Rails since version 2.x on projects ranging from end-to-end app development, through working with legacy code, performing code reviews, to upgrading old Rails apps and gems to the newest versions

Worked as a senior backend engineer for Alation, helping to scale their initial SaaS product to the current version (serving more than 100 big enterprise customers). Also worked on smaller projects using both Flask and Django.

I've used D3 to build simple visualizations, implemented a custom library to render interactive charts using D3's primitives and used C3.js to add charting capabilities to SaaS apps.

I've used C++ to write low-latency system services, using both "classic" C++ as well as modern constructs available in C++11, C++14, C++17 and C++20. I know how to optimize code taking advantage of constexpr and compile-time evaluation, how to use template metaprogramming to reduce amount of code and how to structure classes & methods for maximum composability.

I also have experience with configuring C/C++ toolchains and continuous integration systems, using both Bazel and Cmake

Coming from React.js background, I learned and mastered Vue.js while working on 2 web applications: 1) a tool to calculate and visualize SaaS metrics (customer churn,  revenue churn, cross-sell, upsell) etc and 2) a personal nutrition and fitness planner and tracker

I've been using node to implement microservices, to power up React & Vue frontend apps. I've used Express JS, Sails.js and often MongoDB as the primary data store. I also used Node to implement multi-user socket servers, to provide communication channels via websockets and WebRTC.

I've been using node to implement microservices, to power up React & Vue frontend apps. I've used Express JS, Sails.js and often MongoDB as the primary data store. I also used Node to implement multi-user socket servers, to provide communication channels via websockets and WebRTC.

I've worked with PHP since 2005. I wrote Wordpress plugins, Drupal modules, used MVC frameworks like Laravel and CakePHP.

Have been using PostgreSQL since version 6.5 (~2000). I wrote stored procedures, triggers, designed databases with hundreds of tables, optimized PostgreSQL settings for performance etc.

Deployed and administered custom Odoo installations customized for the furniture industry. Wrote custom addons implementing new functionality, and integrating data with external systems (single sign-on, inventory synchronization, Quickbooks accounting and others)

Used Heroku as a deployment platform for Rails, node & Django projects. I can help you upgrade your apps to newer Heroku stacks & solve deployment and dependency problems.

Personal details

Marek P.

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