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Nikolaos – Python, Django, Ruby, experts in Lemon.io

Nikolaos

From Greece (GMT+3)

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Back-end Web DeveloperMiddle-to-senior
Hire developer
9 years of commercial experience
E-commerce
Food and beverages
Music and audio
Social media
AI software
Customer support software
Enterprise software
Mobile apps
Platforms
SaaS
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Nikolaos – Python, Django, Ruby

Nikolaos boasts over 8 years of experience designing and developing scalable systems, specializing in Python-based backend solutions. Skilled in creating robust data pipelines, integrating AI-powered features, and managing complex distributed systems, he has a proven ability to lead teams in developing microservices and optimizing performance for high-traffic environments. Experienced in working with cloud infrastructure (AWS) and machine learning integrations, with a passion for solving technical challenges in fast-paced, collaborative environments.

Main technologies
Python
6 years
Django
6 years
Additional skills
Ruby
Ruby on Rails
Data Science
Flask
REST API
AWS
JavaScript
Lambda
PostgreSQL
MariaDB
MySQL
Redis
MongoDB
jQuery
HTML
CSS
Ready to start
ASAP
Direct hire
Potentially possible

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Experience Highlights

Senior Software Engineer
Mar 2023 - Aug 20241 year 5 months
Project Overview

Building new integrations for CRM systems, Enabling AI Analysis on CRM data

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Responsibilities:
  • Enabled 3 new chat integrations with CRM systems
  • Enabled integrations with 4 telephony systems
  • Integrating with External voice transcription and PII redaction systems
  • Maintained company's monolith, fixing bugs and implementing new features
  • Improved the existing data ingestion pipeline to make it more scalable and fault-tolerant
Project Tech stack:
Python
Django
Django REST
Flask
Celery
Docker
Docker Compose
Kubernetes
ElasticSearch
AWS
Amazon S3
AI
GPT
GPT-3
GitHub
GitLab CI
CD
GitHub Actions
LLM
API
Senior Python Engineer
Nov 2021 - Mar 20231 year 4 months
Project Overview

Building Integrations with delivery partners that provide delivery as a service to restaurants. Development of an algorithm that selects the best delivery partner to execute each order, taking into consideration the company's profit and customer's satisfaction.

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Responsibilities:
  • Redesigned back-end architecture
  • Integrated new providers
  • Developed a system to pick the best providers for each order
  • Maintained the microservices and the big monolith
Project Tech stack:
Python
Django
Celery
Django REST
AWS
Python
Django
Django REST
Celery
AWS
Amazon S3
AWS SES
Amazon EC2
API
AWS Lambda
Redis
Kafka
Amazon RDS
PostgreSQL
Pyramid
Back-end Engineer
May 2021 - May 20221 year
Project Overview

RESTful API for an innovative Social Media mobile application.

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Responsibilities:
  • Created back-end architecture
  • Lead a team of 3 BE Engineers
  • Worked with Mobile Engineers to standardize API
  • Implemented API with performance in mind
  • Deployed service to AWS
  • Wrote unit, integration and e2e tests
Project Tech stack:
Python
Django
REST API
AWS
JavaScript
jQuery
HTML
CSS
Django
Django REST
API
AWS
Amazon S3
Docker
Software Engineer
Apr 2021 - Dec 20218 months
Project Overview

Match records related to music copyrights from label companies and sources like Youtube and Spotify using Deep Learning.

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Responsibilities:
  • Created back-end architecture
  • Implemented new features
  • Scaled service to run for more customers
Project Tech stack:
Python
Flask
AWS
JavaScript
HTML
CSS
jQuery
Software Engineer
Apr 2019 - Apr 20212 years
Project Overview

Biggest marketplace and price-comparison engine in Greece.

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Responsibilities:
  • Worked on various internal projects as part of the Kernel Team (Core Product Department). Tasks mainly related to Backend Development using Ruby on Rails, MariaDB, Kafka and ElasticSearch
  • Was in charge of scaling, performance, and reliability
  • Made an identification of bottlenecks in the main application
  • Detected and fixed problematic slow queries or parts of code
  • Moved parts of code that hit external services or APIs to asynchronous task queues using Kafka.
  • Applied security fixes
  • Increased and monitored test suite coverage during the upgrade phase
  • Integrated new features of the framework
  • Was in charge of User Account Protection
  • Refactored and improved existing authentication and authorization system
  • Implemented features regarding users’ security and GDPR
Project Tech stack:
Ruby on Rails
MySQL
ElasticSearch
JavaScript
jQuery
HTML
CSS

Education

2015
Electrical and Computer Engineer
MSc
2022
Data Science
MSc

Languages

French
Pre-intermediate
Greek
Advanced
English
Advanced

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