Sergey K.

About Me

I am a highly skilled Full Stack Developer and Analyst with 15 years of in-depth expertise in Frontend/Backend technologies, best practices, design patterns, UI/UX technologies, and database technologies. I have mastery in the full mobile development life cycle and provide technical leadership for the implementation of different high-volume mobile consumer products. I have incredible performance and memory tuning skills and deliver highly-rated apps to the App Store.

AI, ML & LLM

Frontend

Backend

Database

DevOps

Workflow

Other

Work history

UpStack
UpStack
Senior Full Stack Developer
2019 - Present (6 years)
Remote
  • Creating and developing innovative software solutions for clients across a broad range of industries.

  • Participate in scrums consisting of cross-functional teams, both software and hardware.

  • Ensure that features are being delivered efficiently and on-time.

My MixTapez
My MixTapez
Senior Full Stack Developer / Lead Architect
2020 - 2020
Remote
  • Led the development of an online music streaming platform where users can listen, download and stay connected in the best mixtapes and hip-hop music of the world. Developed My MixTapez back end service for user players marketing data analytics using cloud Firebase API services: Authentication API.

  • Developed My MixTapez Firebase Cloud functions back end services for managing songs, created algorithms for finding matching top singers in order to show them in the top records, news etc. Scale internal infrastructure for both managed and unmanaged services ranging from Postgres to Kafka to BigQuery.

  • Developed serverless Firebase Function services using NoSQL/Firestore integration, which allows to keep user data schemaless. Managed Payment API integration with Stripe which allows user to process online payments.

Loyalty One
Loyalty One
Senior Full Stack Engineer
2019 - 2021 (2 years)
Remote
  • Built and deployed new rewards features for Loyalty One to manage new programs and products for clients using Scala, React/Redux and Node.js. Developed back end services using Firebase/AWS combined cloud solutions.

  • Developed Loyalty marketing cloud function services to analyze data from NoSQL/Firestore schemaless document storage. Worked on new components and integrated them into existing frontend apps using different AWS services and Scala/Akka messaging solutions for client notification.

  • Developed Firebase Authorization cloud services during SSO integration marketing application with external 3 party system. Produced a Scala B2B app to handle scaling of Loyalty's programs - implementing world-class data and analytics solutions to create direct access for actionable insights.

Home Depot
Home Depot
Senior Ruby on Rails Developer
2019 - 2020 (1 year)
Remote
  • Worked on the design and development of a highly distributed Ruby on Rails web application suite for HomeDepot's high performance, high traffic, and advanced interactive site.

  • Oversaw tasks on the architecture, testing, deployment of complex business rules, SEO and instrumentation; developing best practices and handling release to the AWS cloud.

  • Liaised with the Product Management and User Experience experts on the project for product definition, schedule, scope and taking project-related decisions.

Home Pro Digital
Home Pro Digital
Senior Python/Django Developer
2018 - 2019 (1 year)
Remote
  • Designed and built the core engine on Home Pro Digital's Python/Django secured platform: sessions, caching, generic views, database query caching, web services/Django Restful APIs, models, and routes.

  • Worked closely with the product management and UI teams to drive the design and delivery of new processes, guidelines, team rules, and best practices on the system.

  • Prepared technical documentation, managed testing and bug fixes and worked on the design and implementation of functional requirements.

ZenMaid
ZenMaid
Senior Fullstack Developer
2017 - 2019 (2 years)
United States of America
  • Designed and developed web and mobile solutions for ZenMaid; defining best practices on quality, reliability and scalability.

  • Iterated the Angular UI components and Ionic mobile UI components; working on authentication and authorization on the project.

  • Handled all database and backend infrastructure activities; architecting the REST JSON data, GraphQL query caching, tuned queries and performed other duties as required on the project.

FedEx Canada
FedEx Canada
Senior Full Stack Developer
2015 - 2019 (4 years)
Toronto, Canada
  • Provided technical expertise and leadership for the design/development of a brokerage web/mobile-based application for Fedex.

  • Worked on the development of a Brokerage CBSA Transport Logistic Web Portal Application; to enable users manage goods, monitor transport channels and submit custom documentations.

  • Improved system stability and increased brokerage processes by 125% through the portal.

DB Schenker
DB Schenker
Senior Full Stack Developer
2013 - 2015 (2 years)
Missisauga, Canada
  • Actively participated in the design and review of technical requirements, architecting of prototypes, data modelling, data integration and QA tasks for the client.

  • Efficiently identified and automated several processes for the implementation of features on the new Canada custom brokerage platform that reduced manual work for most tasks.

  • Successfully increased the performance of data processing on the system by introducing new cutting edge approaches on the platform using AWS Cloud, LAMBDA, and data messaging approach.

Air Transat Vacation
Air Transat Vacation
Senior Full Stack Developer
2010 - 2013 (3 years)
Montreal, Canada
  • Successfully led a team of software engineers to achieve a 250% growth in revenue for the company over a three-year period.

  • Handled day-to-day technical tasks on the project efficiently; utilizing cutting-edge technologies and development best practices for the client.

  • Oversaw the rollout of a new system with synchronization to different inventory providers for enhanced product reporting.

Rogers Telecommunication
Rogers Telecommunication
Senior Full Stack Developer
2008 - 2010 (2 years)
Toronto, Canada
  • Worked with other engineers to devise a resilient architecture for Rogers and optimized the software to handle millions of requests per minute.

  • Developed a responsive web/mobile application that allowed network users to monitor the Rogers network, ping and connect remote devices.

  • Deployed a real-time network self-service software to help Rogers technicians and network users to do a self service on key Rogers network services (TV, mobile, internet and other services)..

 Reserve America
Reserve America
Software Engineer
2005 - 2007 (2 years)
Canada
  • Designed and developed “​Reserve America Online Web Portal​” application.

  • Developed Web Portal Application for managing user casino services and letting users to sign in into online casino application and play.

  • Worked on the integration of an Online Casino Application using SOA Web Services with Orbis (third party payment system).

Showcase

Lead Architect - Mymixtapez
Lead Architect - Mymixtapez
  • A music streaming platform focused on hip-hop and mixtapes.

  • Utilizes Firebase API services for user marketing data analytics and backend service.

  • Developed a form and data management template using Form.io and Form.io library, with REST API generated for each form.

Senior Python/Django Developer - Home Pro Digital
Senior Python/Django Developer - Home Pro Digital
  • Home Pro Digital specializes in online marketing and website solutions for construction contractors, home service providers, and remodelers.

  • They developed an online platform app using Python/Django, React/Redux, AWS Cloud, and Mobile Flutter/Dart.

  • They designed and built the core engine of the secured platform, including sessions, caching, database query caching, web services/Django RESTful API/roles, models, routes, and more.

Mobile Application Developer - Yidio
Mobile Application Developer - Yidio
  • Yidio is a personalized TV and movie guide app that helps users discover content and save time and money.

  • It utilizes React Native, iOS, and Android UI components for a seamless user experience.

  • The project includes a Node.js/MongoDB RESTful API, streaming API, SSO, data elastic search, and other business services.

Mobile Application Developer - RA Camping
Mobile Application Developer - RA Camping
  • Developed and deployed an online campground reservation mobile application for ReserveAmerica.

  • Engineered a React Native mobile application with custom UI components, styles, animation, and services for search, map-based filtering, and data management.

  • Implemented a RESTful JSON API for user authentication, authorization, data caching, and integration with external APIs and analytics.

Senior Full Stack Engineer - Air Transat Vacation
Senior Full Stack Engineer - Air Transat Vacation
  • Developed an online booking portal for Air/Vacation travel, integrating AQ Messaging and Inventory for third-party clients.

  • Implemented a secure HTTPs RESTful API for communication with the reservation engine and reporting.

  • Achieved a 250% increase in online sales within 3 years through expanded visibility and sales growth.

Senior Full Stack Engineer - Rogers Telecommunication/Enterprise – Network Solution Business Application for Enterprise Clients
Senior Full Stack Engineer - Rogers Telecommunication/Enterprise – Network Solution Business Application for Enterprise Clients
  • Developed a responsive web/mobile application for network monitoring.

  • Provides functionality for network users to ping and connect remote devices.

  • Offers features for performance tracking (speed, power, time, signal direction) and service management (ticket issuance, bill payment, self-service).

Senior Full Stack Developer - FedEx tracking System/Brokerage System
Senior Full Stack Developer - FedEx tracking System/Brokerage System
  • Developed and maintained a brokerage CBSA Transport Logistic Web Portal Application for brokers.

  • The application enables brokers to manage imported/exported goods, monitor transport channels, and communicate with Border Security.

  • The application resulted in a 150% increase in brokerage goods processing and a 50 million/quarter revenue increase.

Education

Authorized Web ReactJS/AngularJS Developer
Authorized Web ReactJS/AngularJS Developer
College of Technologie, Toronto - Canada
2012 - 2014 (2 years)
MSc. Computer Science
MSc. Computer Science
University of Toronto
2003 - 2008 (5 years)