Viktor Lazarchuk

Experience

• 

  RENOME SMART

  Mar 2018 - Jul 2018

  Software Engineer
• 

  ComLine

  Aug 2018 - Aug 2019

  Network Administrator
• 

  PREA Group

  Jan 2020 - Aug 2021

  Full-stack Developer

  Project: NDAAssistance, Consultation, and Forecasting Platform for the Real Estate Market Using Neural NetworksUsing: ReactJS, Gatsby, GraphQL, RestAPI, Express.js, Node.js, MongoDB, Redis, Docker, pm2, Jest, AWS (Lambda, EC2, S3, IAM, CloudWatch, VPC)Linux, Stripe IntegrationMade by me:-Responsible for building and managing AWS infrastructure, including Lambda functions, EC2 instances, and S3 storage.-Implemented and designed the backend RestAPI using Express.js for seamless communication between frontend and neural network models.-Developed frontend user interfaces using ReactJS and Gatsby, providing a responsive and engaging user experience.- Integrated GraphQL for efficient data fetching and manipulation.- Collaborated with data scientists to integrate neural networks for real estate market forecasting.- Created and managed Docker containers for deployment and scaling.- Implemented Redis caching to optimize data retrieval and improve platform performance.- Conducted thorough testing, including unit tests using Jest and end-to-end tests to ensure the reliability of the platform.Set up a VPC to enhance security and network isolation.Collaborated with UI/UX designers to ensure the platform's user-friendliness and modern design.Conducted code reviews to maintain code quality and mentor junior developers.Shared knowledge and insights through informative technical talks, including explaining complex concepts like neural network integration and GraphQL optimization. Show less

• 

  RIVO AGENCY

  Jul 2021 - Feb 2022

  Full-stack Developer

  Project: mens.comOnline pharmacy with the integration of USA government services for issuing prescriptions for medicines and shipment systems.Using: node.js, express.js, socket.io, mongodb, redis, docker, pm2, jest, serverless (for aws lambda), aws (lambda, ec2, s3, IAM, KMS, CloudWatch, VPC), linux, stripe identityMade by me:- I was responsible for everything related to aws lambda and their infrastructure.- I have implemented part of API on the project.- Made a scaled chat by using redis pubsub. - Implemented field-level encryption with mongocryptd.- Integrated with stripe identity and geniusrx API.- Set up the VPC.- Wrote e2e and unit tests.- Refactored some part of project.- Sometimes conducted a code review for our junior developer.- Conducted a lecture on the operation of the event loop and the garbage collector in node.js Show less

• 

  SoftServe

  Feb 2022 - Mar 2023

  Full Stack Engineer

  Project: NDATechnologies: Node.js, TypeScript, Nestjs, Jest, Mongodb, PostgreSQL, AWS (SQS, Lambda), AWS Solution Serverless Image Handler, Docker, Socket.io, Redis, PassportJS, JWT, SentryMade by me:- Implemented a system for processing and working with images using AWS Serverless Image Handler.- Engaged in scaling and optimization AWS Lambdas.- Engaged in the development of chats and a search system for interlocutors by location.- Wrote and extended core business logic.- Improved code quality and test coverage.- Fixed lots of bugs.- Participated in code review.Project: keller williamsKeller Williams is an American technology and international real estate franchise. I worked in the team that was responsible for the system of sending messages and notifications. Technologies: Node.js, TypeScript, Nestjs, Jest, Mongodb, Mysql, GCP PubPub, GCP Bigquery, DockerMade by me:- Implemented webhook for mailgun, part of message services, template service and part of notification services.- Wrote and extended core business logic.- Improved statistic service because it had not worked correctly.- Improved code quality and test coverage.- Rewrote modules in the system that are responsible for subscriptions.- Rewrote the same legacy part of the project to TypeScript.- Fixed lots of bugs.- Participated in code review. Show less

• 

  Wiztech Group

  Mar 2023 - now

  Senior Back End Developer

  Project: NDAMicroservice architecture for serving a large number of users(High Load) from different brands. Payment systems, games, promotions, awards, statistics and CRM for internal use etc. System for viewing the quality of the work of operators and not only. Includes the ability to create a stream, view it, take screenshots and record video. There is a license mechanism, fine-tuning the number of streamers and consumers and they roles management and company, the ability to group streams by resources. Easy work with content and rooms, etc. The ability to easily deploy a docker image with a ready-made worker for video streaming, a lightweight npm package for system integrations to connect with the worker, auto scaling Technologies: Node.js, TypeScript, Nestjs, Docker, Kuber(CKD8s) , AWS( a lot of services) , Jenkins, Mediasoup(WebRtc), SocketIO, RabbitMQ, Kafka, Redis( cashing, pub/sub, bullmq ), PostgreSQL, VectorDB, Metabase , PassportJS, JWT, Sentry, Logstash , ViktoriaLogs, Grafana, Prometheus, telecall, c3ntro, twilio, KYC, Cashier, stripe kushki, actnet,xbo, Cellexpert, Appsflyer, and a lot of customs game integration with difference api and logics Made by me:- Implemented architecture and system from scratch- Responsible for delivering the project to the client. Used and implemented everything that is described, came out and more-Managed integrations on the project-Worked on crontab development-Made business decisions on projects Show less

• 

  FoxmindEd

  Jun 2023 - Aug 2024

  Mentor

  As a seasoned Senior Node.js Mentor/Consultant at our company, you'll be a pivotal figure in shaping and advancing our Node.js development efforts. Leveraging your extensive experience and deep knowledge of Node.js, you'll play a critical role in guiding our development teams, fostering best practices, and delivering high-quality solutions.Key Responsibilities:- Technical Guidance: Provide expert guidance and mentorship to development teams, helping them navigate complex technical challenges and ensure the adoption of Node.js best practices.- Code Reviews: Lead and participate in code reviews, offering constructive feedback to enhance code quality, readability, and adherence to established coding standards.- Performance Optimization: Identify performance bottlenecks in Node.js applications and provide recommendations for optimization to enhance application efficiency and responsiveness.- Problem Solving: Act as a go-to resource for troubleshooting and resolving technical issues, helping teams overcome obstacles and maintain project momentum.- Technical Workshops: Conduct technical workshops and knowledge-sharing sessions to empower developers with the latest Node.js trends, tools, and techniques.- Mentorship: Mentor junior developers, fostering their growth and development within the Node.js ecosystem, and nurturing a culture of continuous learning.es. Show less