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Oleksii – Node.js, Typescript, JavaScript, experts in Lemon.io

Oleksii

From Czech Republic (GMT+2)

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Back-end Web DeveloperSenior
Hire developer
8 years of commercial experience
Adtech
Automotive
Business intelligence
E-commerce
Edtech
Fintech
Gambling
Insurance
Logistics
Lemon.io stats
1
projects done
1
hours worked
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to new offers

Oleksii – Node.js, Typescript, JavaScript

Introducing Oleksii, a seasoned Senior Back-End Developer with a wealth of expertise in Node.js, both in JavaScript and TypeScript. His practical experience spans across various Node.js frameworks, coupled with a strong grasp of object-oriented programming and test-driven development practices. With a vast knowledge of AWS and proficiency in both relational and NoSQL databases, Oleksii is well-versed in backend architectures, from monolith to microservices and serverless. His leadership experience further enhances his contributions, evident in his successful involvement in diverse projects such as gambling, logistics optimization, and insurance applications.

Main technologies
Node.js
5 years
Typescript
3 years
JavaScript
5 years
AWS
4 years
Additional skills
React
Angular
PHP
Kubernetes
PostgreSQL
Redis
RabbitMQ
Microservices
GitLab
Jest
UML
DDD
CQRS
gRPC
Kafka
Bitbucket Pipelines
Lambda
DynamoDB
MongoDB
REST API
Chai
Mocha
WebSocket
MySQL
GCP
Docker
Express.js
Firebase
Microservices
WebSocket
MySQL
RabbitMQ
GitHub Actions
Apollo GraphQL
Ready to start
ASAP
Direct hire
Potentially possible

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Experience Highlights

Node.js Team Leader
May 2021 - Ongoing3 years 5 months
Project Overview

Worldwide betting solution with a huge amount of different gambling services. The team is oriented on Payment Stream solutions.

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Responsibilities:
  • Made initial analysis of business features, provided feedback regarding implementation, and impacted the current system;
  • Converted high-level features into defined technical tasks;
  • Coordinated with the Head of Engineering/team leaders from another team regarding complex features and connections;
  • Assisted with the technical implementation of the team consisting of 5-7 software engineers;
  • Defined the architecture of services, possible improvements, and performance tuning;
  • Participated in the company technical interviews for other teams, made skill checks with the definition of PDP;
  • Took care of the team's satisfaction to provide a comfortable condition for work.
Project Tech stack:
Node.js
AWS
Kubernetes
PostgreSQL
Redis
RabbitMQ
Microservices
Layered architecture
IoC
GitLab
Jest
PlantUml
Part-Time Tech Lead
Jan 2019 - Jul 20212 years 5 months
Project Overview

Big policy insurance solution that is oriented to replace different manual jobs with automated processes.

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Responsibilities:
  • Setup project both on technical / team sides starting from MVP till the stable phase;
  • Implemented insurance financial solution based on microservices with the connection to external CRM based on Golang and MQ system;
  • Rendered technical management of the entire team (backend/frontend SE, QA) and directly communicated to product owners, led the deployment process, maintained code quality of codebase by regular code reviews;
  • Resolved any production or deployment issues;
  • Involved in the roadmap creation and help to groom the ideas.
Project Tech stack:
Node.js
Microservices
Kubernetes
Koa.js
Sequelize ORM
Knex
PostgreSQL
Golang
RabbitMQ
AWS
Route53
Lambda
CircleCI
Typescript
REST API
Redis
Chai
Mocha
GitHub
Helm
React
Senior Node.js Developer
Aug 2020 - May 20219 months
Project Overview

Modern IoT solution that was created to optimize logistic processes by tracking truck movements.

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Responsibilities:
  • Developed truck management system based on IoT devices;
  • Took care of full-pipe data processing from raw device signal until delivered to target services;
  • Implemented high load solution to achieve the best performance;
  • Re-architectured process to achieve the best data consistency on each data step;
  • Setup new AWS services for load balancing, databases, etc., and creation of tech docs for other team members
Project Tech stack:
Node.js
DDD
Microservices
CQRS
gRPC
AWS SQS
SNS
Kafka
Bitbucket Pipelines
Lambda
ELB
Redis
DynamoDB
PostgreSQL
Jest
Senior Node.js Developer
Jan 2019 - Aug 20201 year 6 months
Project Overview

Massive company with different project streams oriented toward some business goals.

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Responsibilities:
  • Developed and supported AdTech platform related to the integration of advertiser and publisher side;
  • Refactored fraud&tracking server from scratch;
  • Supported portal system related to the full cycle of the AdTech industry;
  • Took care of investigation into complaints from end to end (from logs until diving into external code);
  • Created admin panel for advertisers, updated SDK, and added templates;
  • Participated in the PR review process, directly communicated with business managers, and took care of learning new team members.
Project Tech stack:
Node.js
AWS
Microservices
layered architecture
PostgreSQL
MongoDB
RabbitMQ
REST API
Jenkins
Chai
Mocha
BitBucket
Lambda
Redis
Angular
Node.js Developer
Jan 2018 - Jan 20191 year
Project Overview

It is an educational project which was created to boost financial knowledge in the business area.

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Responsibilities:
  • Developed a financial system
  • Worked on the implementation of a study platform using microservices and data migration scripts
  • Developed API for iOS and Android applications using FCM, and web sockets
  • Created new services to manage bookings, events, chat
  • Monitored load and checked possible improvements
  • Supported legacy subsystems
Project Tech stack:
Node.js
WebSocket
Kubernetes
PostgreSQL
MySQL
MongoDB
Microservices
RabbitMQ
GitHub Actions
Redis
GitHub
AWS

Education

2020
Information systems and technologies
Master degree with honours

Languages

English
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