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Sebastian Karasiewicz

Sebastian Karasiewicz

Senior Full-Stack Developer

Hard-working, reliable, and problem-solving programmer with 12 years of professional experience. Expertise in backend systems, API/database design, refactoring, and testing.

Contact MeView Projects

Technical Skills

Frontend

  • JavaScript/TypeScript (★★★★☆)
  • React.js / Next.js
  • HTML5 / CSS3
  • Tailwind CSS

Backend

  • Python (Django, Flask) (★★★☆☆)
  • Ruby (Ruby on Rails) (★★★☆☆)
  • Go (★★★☆☆)
  • RESTful APIs (★★★★★)

DevOps & Tools

  • Databases (PostgreSQL, MySQL, MongoDB)
  • GCP & Docker
  • AWS (Lambda, S3, SES, SNS)
  • AI Tools (Copilot, GPT, Gemini) (★★★★☆)

Work Experience

Senior Engineer

•Developrec (Diageo)

May 2024 - Present

  • On-site with Diageo

Senior Full-Stack Developer, Client & Team Lead

•SoftKraft

Nov 2019 - Aug 2024

  • Focus on software solutions for data processing, visualization, AI, ML, dashboards, BI, and cloud technologies
  • Tech stack: Python, Go, Java, React, AWS, GCP, DevOps
  • Worked with business enterprises and consultancies on data-driven software innovations

Software Developer

•Sofomo

Feb 2017 - Feb 2020

Software Development Manager

•PLUSGPS Q4B Sp. z o.o. Sp. k.

Jan 2016 - Dec 2016

  • Managed high-pressure business demands with fast-changing technologies

Backend Developer

•Coderion

Jan 2015 - Dec 2015

  • Java development for complex financial applications

Backend Developer

•Selleo

Mar 2014 - Sep 2015

  • Supported PipelineDeals.com, a key client

Backend Developer

•Profit Plus Sp. z o.o.

Sep 2012 - Mar 2014

  • Developed and upgraded the Merlin X tourist reservation system

Featured Projects

CAAS

Customer Account Attribution Service

A microservice-based solution for customer account management and attribution.

GoAWS LambdaAWS SESAWS SNS
MLSWorldwide

Real Estate Aggregator

A comprehensive real estate aggregation platform with RESTful APIs and advanced search capabilities.

PythonDjangoRESTful API
TachoOnline

Driver Time Monitoring

A system for monitoring and managing driver time records with cloud-based storage and reporting.

GoGoogle App EngineGoogle Cloud StorageDocker
Nixie

Data Aggregation & Visualization

A platform for collecting, aggregating, and visualizing data with interactive dashboards.

PythonFlaskInfluxDBGrafana
VideoTranscoding

Video Transcoding Service

A cloud-based service for video processing and transcoding with serverless architecture.

PythonAWS LambdaAWS S3API Gateway
Short-Term Rental

Short-Term Rental Management App

A comprehensive platform for managing short-term rental properties with booking and payment features.

PythonDjangoReact.jsPostgreSQL
Wall-e

MyVR Extension

An extension for the MyVR platform providing additional functionality for vacation rental management.

PythonDjangoReact.jsAzure Cloud
Beecron

Beacon Navigation

A system for indoor navigation using beacon technology with real-time location tracking.

GoGoogle App EngineCloud DatastoreDocker
StaffSupervisor

Call Monitoring System

A platform for monitoring and analyzing call center performance with detailed reporting.

GoGoogle App EngineCloud StorageDocker
Content Publishing

Content Publishing Platform

A full-stack platform for creating, managing, and publishing digital content with real-time collaboration.

GoRuby (RoR)React.jsWebSockets
E-commerce

E-commerce App for E-Cigarettes

A specialized e-commerce platform for electronic cigarettes with inventory and order management.

RubyRuby on RailsPostgreSQLDocker
Mubi

Insurance Comparison Platform

A frontend application for comparing insurance products with interactive user interface.

React.jsTypeScript
Van Selling

Food Distribution System

A logistics and inventory management system for food distribution with mobile support.

Node.jsExpressSequelizePostgreSQL
MailExp

Email Tracking System

An application for tracking and analyzing email communications with Gmail integration.

Node.jsFastifyMongoDBGmail API
IdeaFaktor

Financial Application

A financial management application with transaction tracking and reporting capabilities.

JavaWicketSpringPostgreSQL
PipelineDeals

CRM System

A customer relationship management system with sales pipeline tracking and reporting.

Ruby on RailsRSpecMySQLBackbone

Get In Touch

Email

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Phone

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Languages

English (C1)

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