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Senior
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Senior Developer
George Leszczynski
,
London, United Kingdom
Experience
Other titles
Skills
I'm offering
Senior Developer experienced in http://********.***, Cordova, Angular, http://********.***, Javascript. Collaborated with clients including UCAS Media, Foyles, public energy companies and the public sector.
Passionate and quality driven software developer, specialising in web and hybrid mobile development. I’m a keen advocate of software development standards, while maintaining timely, high quality deliverables and best possible user experience.
My experience includes:
- Front end development: http://********.***, Angular, Cordova, Ionic, JavaScript (including ES6), HTML5, CSS/SASS/Stylus
- Back end development: http://********.***, Django, Firebase, AWS, Google Cloud Platform, ElasticSearch
- Mobile: Cordova, Ionic, Phonegap
- Designing technical architecture
- Setting up CI / CD pipelines
Passionate and quality driven software developer, specialising in web and hybrid mobile development. I’m a keen advocate of software development standards, while maintaining timely, high quality deliverables and best possible user experience.
My experience includes:
- Front end development: http://********.***, Angular, Cordova, Ionic, JavaScript (including ES6), HTML5, CSS/SASS/Stylus
- Back end development: http://********.***, Django, Firebase, AWS, Google Cloud Platform, ElasticSearch
- Mobile: Cordova, Ionic, Phonegap
- Designing technical architecture
- Setting up CI / CD pipelines
Markets
United Kingdom
Links for more
Once you have created a company account and a job, you can access the profiles links.
Language
English
Fluently
Ready for
Larger project
Full time contractor
Available
My experience
2018 - 2020
job
Senior developer
QDooz.
Led the development of a web and mobile learning platform and collaborated with its B2B partners
(including UCAS Media and Totaljobs).
• Built a SPA website and a bespoke CMS and using Vue.js and Vuex.
• Developed a Node.js and TypeScript back-end built on Google Cloud Platform.
• Built a mobile application using Vue.js and Cordova.
• Created complex UI interfaces using HTML, CSS/SASS (following BEM) and HTML5.
• Reduced page load times by integrating ElasticSearch and implementing progressive loading.
• Built a CI/CD pipeline managing builds and deployments of the website and 'dockerised' the project.
• Wrote unit tests and end-to-end tests using Jest and Cypress.
• As a scrum master, ran daily stand-ups and sprint planning sessions.
(including UCAS Media and Totaljobs).
• Built a SPA website and a bespoke CMS and using Vue.js and Vuex.
• Developed a Node.js and TypeScript back-end built on Google Cloud Platform.
• Built a mobile application using Vue.js and Cordova.
• Created complex UI interfaces using HTML, CSS/SASS (following BEM) and HTML5.
• Reduced page load times by integrating ElasticSearch and implementing progressive loading.
• Built a CI/CD pipeline managing builds and deployments of the website and 'dockerised' the project.
• Wrote unit tests and end-to-end tests using Jest and Cypress.
• As a scrum master, ran daily stand-ups and sprint planning sessions.
Google cloud, CI / CD, LED, Spa, Google, Senior Developer, Web, Development, Cordova, Jest, Developer, Mobile Application, Website, Google Cloud Platform, Node, Vue, Css, Elasticsearch, Cloud, CSS/Sass, UI, Sass, Typescript, Scrum master, CMS, Vue.js, B2B, HTML/CSS/Javascript, Scrum, Node.js, Html, Html5
2016 - 2018
job
Senior developer
MK21 Digital.
Developed SaaS platforms using Angular and Django (Python) for retail, leisure and energy industries and the public sector. Clients included Foyles, Milton Keynes Council and public energy companies.
• Built web and mobile e-commerce applications used by several popular UK-based venues and large
shopping centres (including Xscape Milton Keynes and Squires Garden Centre).
• Developed an application for Milton Keynes Council in Ionic Framework (Angular, TypeScript).
• Built a website for a public energy company, optimised to work in high-traffic conditions by reducing
the load placed on the server.
• Optimised the back-end booking process to handle high-traffic load (over 100 concurrent requests).
• Developed a multi-tenant back-end using Django Framework (Python) storing data of each SaaS
client in a separate database.
• Created an instant messaging module using WebSockets and Socket.IO.
• Built web and mobile e-commerce applications used by several popular UK-based venues and large
shopping centres (including Xscape Milton Keynes and Squires Garden Centre).
• Developed an application for Milton Keynes Council in Ionic Framework (Angular, TypeScript).
• Built a website for a public energy company, optimised to work in high-traffic conditions by reducing
the load placed on the server.
• Optimised the back-end booking process to handle high-traffic load (over 100 concurrent requests).
• Developed a multi-tenant back-end using Django Framework (Python) storing data of each SaaS
client in a separate database.
• Created an instant messaging module using WebSockets and Socket.IO.
Developer, Energy, Framework, Energy, Booking, Websockets, Server, Senior Developer, Web, Public sector, Python, Website, Ionic, Saas, Database, E-commerce, Django, Typescript, Retail, Angular
2016 - 2016
job
Full-stack developer
SwishVideo.
Developed a web and mobile video discovery platform.
• Built an iOS and Android application using Ionic Framework (Angular) with additional native, platform-
specific features written in Java and Objective-C.
• Created a bespoke CMS in AngularJS.
• Built a Node.js back-end system using AWS.
• Designed a module replicating data between relational and NoSQL databases to ensure scalability of the application and facilitate querying.
• Implemented complex animations leveraging CSS/SASS and HTML5 canvas.
• Built an iOS and Android application using Ionic Framework (Angular) with additional native, platform-
specific features written in Java and Objective-C.
• Created a bespoke CMS in AngularJS.
• Built a Node.js back-end system using AWS.
• Designed a module replicating data between relational and NoSQL databases to ensure scalability of the application and facilitate querying.
• Implemented complex animations leveraging CSS/SASS and HTML5 canvas.
Objective-c, Framework, Native, Scalability, Canvas, Web, Developer, Ionic, Node, NoSQL, C, CSS/Sass, Css, Sass, AngularJS, CMS, Video, AWS, IOS, Android, Angular, Node.js, Java, Html5
2015 - 2016
job
Technical Lead
Neotrino Ltd.
Ran a software agency creating mobile applications and websites.
Neediz - Application facilitating business introductions
• Developed Android and iOS applications in Ionic Framework (Angular).
• Built a supporting back-end hosted on Google App Engine developed in Python using non-relational
datastore. Developed a module analysing emails sent by end-users.
• Led the development of application front-end, wrote technical specifications and conducted
acceptance testing.
SpareMyTime - London-based online work marketplace
• Led the development of website front-end and managed a team of 5 programmers.
• Developed back-end using Django Framework and Redis built on AWS.
Neediz - Application facilitating business introductions
• Developed Android and iOS applications in Ionic Framework (Angular).
• Built a supporting back-end hosted on Google App Engine developed in Python using non-relational
datastore. Developed a module analysing emails sent by end-users.
• Led the development of application front-end, wrote technical specifications and conducted
acceptance testing.
SpareMyTime - London-based online work marketplace
• Led the development of website front-end and managed a team of 5 programmers.
• Developed back-end using Django Framework and Redis built on AWS.
Website, LED, Tech lead, Framework, Online, Google, App, Software, Testing, Development, Python, Ionic, Redis, Django, Websites, AWS, IOS, Android, Angular
2014 - 2015
job
Technical Lead
IQ Friends.
Led the development of an AngularJS website, Android and iOS mobile applications.
• Developed back-end using Django and Redis and conducted load testing.
• Migrated database of 3 million users and moved the back-end system from Rackspace to Microsoft
Azure cloud service.
• Set up continuous integration, staging and production environments.
• Rebuilt the website's front-end from Django Templates to an Angular.js SPA.
• Developed back-end using Django and Redis and conducted load testing.
• Migrated database of 3 million users and moved the back-end system from Rackspace to Microsoft
Azure cloud service.
• Set up continuous integration, staging and production environments.
• Rebuilt the website's front-end from Django Templates to an Angular.js SPA.
Service, UP, LED, Tech lead, Spa, Load testing, Production, Continuous integration, Testing, Development, Website, Angular, Integration, Redis, Cloud, Database, Django, AngularJS, Azure, IOS, Android
2013 - 2014
job
Mobile developer
Shake Well Games Ltd.
Developed games in Cocos2d-x engine, released on over 10 platforms (web, desktops, mobiles and consoles).
• Was awarded a grant from Microsoft and Nokia AppCampus programme and collaborated with High
Potential Start-up programme organised by the British Government.
• Developed a proof-of-concept mobile AR game allowing to navigate and control objects without
touching the screen, providing Kinect-like experience on mobile devices, by analysing front-facing
camera image using computer vision algorithms.
• Was awarded a grant from Microsoft and Nokia AppCampus programme and collaborated with High
Potential Start-up programme organised by the British Government.
• Developed a proof-of-concept mobile AR game allowing to navigate and control objects without
touching the screen, providing Kinect-like experience on mobile devices, by analysing front-facing
camera image using computer vision algorithms.
Computer vision, Algorithms, Developer, Web, UP
2011 - 2012
job
Computer science demonstrator
University of Wales.
Support and tutoring of undergraduate computer science students.
Support, Science
My education
2010
-
2013
University of Wales
BSc Computer Science, First-class honours
BSc Computer Science, First-class honours
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