First off all, please not - I am not on the market at the moment. If you are recruiter please be aware that contacting me now with offers would be violation of GDPR as I do not authorise using my contact details in this way at the moment.



  • JavaScript ES5, ES6, ES7, TypeScript
  • Vanill,a React, Angular 1, 2/4, Vue, Redux, RxJS, Redux-Observables (not a fan of redux-saga), jQuery, Prototype, YUI, MooTools, OVI
  • NodeJS, Express, AWS Lambda, Serverless Framework
  • Grunt, Gulp, Webpack, Electron
  • AWS CloudFormation, CloudFront, IAM, API Gateway, Route 53, Certificate Manager, RDS, EC2, RedShift, SNS, SES, SQS
  • (Not really fascinated about) PHP 4+, 5+, 7+, Symfony, PHPCake, PHPNuke, Codegniter, Laravel
  • MongoDB, MySQL, PostgreSQl, MsSQL, LevelDB, S3, DynamoDB, OrientDB
  • TDD, BDD, E2E, DDD, CI, Gherkin/Cucumber/Behat, Jasmine, Mocha, Protactor, Jest, NewRelic Synthetics
  • Git, git-flow, marcurial, svn, cvs
  • LEAN, Kanban, Scrum, Waterfall
  • ActionScript, Adobe Flex, Flash
  • Docker, Ansible, Terraform, CloudFormation


Pushfor (UK) - Web & Desktop Lead

Dec 2016 - present

  • migration of Angular 2 application to Express/Electron + React/Vue/Vanilla multiservice stack
  • migration of Angular/jQuery application to Angular 2
  • migration of Angular 2 application to TypedDocker (Electron/Express/React/Vanilla)
  • implementing continuous deployment
  • building style guides
  • building Electron desktop application
  • building customisation via build configuration routines
  • basic devops
  • helping on planning and project management level


SIELAY Ltd (UK) - Founder

Mar 2014 - present (dormant) Previously SIELAY Łukasz Sielski (PL) Nov 2006 - Jan 2014

  • IT and CS Outsourcing
  • Web applications development
  • Project supervising
  • Public Relations
  • Coaching


Enigma Marketing Services (UK) - Senior Full-Stack Developer

Jan 2016 - Dec 2016


Time Inc. UK - Lead Developer for, Ad Technologist

Oct 2014 - Jan 2016

AdTechnologist (since Aug 2015):

building a link between brand IT teams, advertorial sales and ad-ops. Troubleshooting DoubleClick related issues. Auditing and profiling advertorial integrations, websites front-end speed and stability. Assisting teams in fine tuning for better user experience and campaign conversion. Improving usage of data to make proper technology decisions regards browser support and optimisation.

Building analytics tools basing on ServerLess (AWS Lambda, API Gateway, DynamoDB)

Lead Developer Trusted Reviews (Until Aug 2015):

Maintaining and improving . Managing team of developers, keeping LEAN process. Helping improve shared policies, components and testing. Focus on usage of JavaScript and third party integrations.

Apprecia Limited (UK) - Systems Architect

Dec 2013 - Oct 2014

  • Team formation
  • System architecture
  • Rapid prototyping
  • Process implementation
  • Startup delivery
  • Consulting

PureHolidayHomes (PL/UK) - Branch Manager, Lead Developer, acting CTO

May 2011 - Mar 2014

  • Development, projecting and maintain of travel services on
  • Development process management
  • Quality management
  • Development human resource management

Games Factory (PL) - Senior Developer

Apr 2010 - May 2011

Development of both advertisement and social network games.

Nokia Gate5 (DE) - Senior Developer

  • Member of team responsible of JavaScript based maps browser accommodated on millions handsets
  • Constructor of i18n and l10n modules. (PL/UK)

Application Architect: Aug 2008 - Mar 2009

  • Generating rules and guidelines for development department
  • Documenting and supervising software development projects
  • Market research
  • Corporate design and guidelines keeping

Software Developer: Nog 2006 - Aug 2008

  • Developing software for internet service (Visual Basic, Flash, MS SQL)
  • Developing tool appplications on Windows (C/C++, .NET)

PKS Szczecin (PL) - Webmaster

May 2001 - Dec 2006

  • Corporate website development and manage
  • Technological consultant

Gloport/Giganet (PL) - PHP Developer

May 2004 - Nov 2005

  • Web services development
  • Desktop applications development
  • Guiding co-operation with clients

InterSoft (PL) Web Developer

App 2003- May 2003

  • Web services development.