Dorian Sawa

I'm a backend engineer.

About

Dorian Sawa

Senior Software Engineer with 13 years building scalable web applications, microservices, and distributed systems. Ruby on Rails specialist who also works across Python, TypeScript, and Go. I care about clean code, automation, and pragmatic system design — and I've run pipelines processing tens of millions of records a day.

Off the clock I'm a trained cat-sitter and co-run Koty Harcują.

By the numbers

28,536+
Hours worked
7,132+
Coffees consumed
13
Years of experience
Billions
Records processed

Experience

Senior Software Engineer (Remote) · World Economic Forum

04.2025 — present
  • Building a Rails application from scratch for internal WEF needs.
  • Implementing API integrations and asynchronous communication with existing systems.
  • Solving architectural problems and providing full documentation.

Senior Software Engineer (Remote) · Digitree Group

05.2022 — 03.2025
  • Built distributed backend systems (Ruby, Python) on AWS and GCP.
  • Optimized pipelines processing 40M shop offers and 250M images daily.
  • Contributed to a PIM system: feed validation, XML transformation, image processing (S3, SQS, Lambda, Step Functions).
  • Built a TypeScript/Nest.js service with REST APIs, auth, and PostgreSQL.

Senior Software Engineer (Hybrid) · Sales Intelligence

09.2018 — 04.2022
  • Maintained Ruby/AWS backends processing large datasets (MongoDB, DynamoDB, SQS).
  • Built a web analytics event tracking system in Rails handling 3M events/day.
  • Led a product similarity search project using FastText and Inception image models, served via Elasticsearch.

Full-stack Developer (Ruby on Rails) · Hubstyle

10.2015 — 08.2018
  • Built online stores from scratch with Spree Commerce.
  • Integrated and optimized an ERP system with Sidekiq queues.
  • Redesigned the admin panel with Bootstrap, React.js, and Redux.

Full-stack Developer (Ruby on Rails, Remote) · Plane (formerly Pilot)

09.2014 — 09.2015
  • Expanded API features for an international social media SPA in Rails.
  • Built and styled responsive React.js components, working directly with a US client.

Junior Software Engineer (Ruby on Rails) · Grupa Nokaut

11.2012 — 08.2014
  • Built backend features for a distributed price-comparison platform.
  • Expanded a REST API, built report generators, and managed queue workers.
  • Migrated a legacy PHP application to Ruby on Rails.

Skills

Languages

RubyRuby on RailsPython

Modern Web

React.jsJavaScriptHTML5CSS3

Databases

PostgreSQLMongoDBBigQuery

Cloud

AWS (S3, SQS, ECS, Lambda, Step Functions)GCP (Pub/Sub, Cloud Functions, Dataform)

Messaging & Search

SidekiqSQSElasticsearch

DevOps

DockerCI/CDTerraform

Additionally, I've worked successfully with

GoDjangoTypeScriptNest.jsMySQLDynamoDBRabbitMQSpree CommerceJRubyExtJS

Assessments

98%

Alva Labs Logic Test · Feb 2025

Alva's logic test assesses logical ability, i.e., how efficiently one processes complex information and draws accurate conclusions from it.

View full report (PDF) ↗

What people say

I worked closely with Dorian for six years and can confidently speak to his professional capabilities. He's a solid full-stack developer who consistently delivers high-quality code, prioritizing software development best practices. Dorian stands out for his technical versatility, actively engaging with diverse technologies and projects. He's not confined to a single tech stack, which has allowed him to develop a broad and adaptable skill set. His work is marked by professional independence, discipline, and a pragmatic approach to problem-solving. I highly recommend working with Dorian.
DW
CTO | Data Analytics & Cloud Architecture | AI Solutions & Marketing Automation Expert
I have had the privilege of working with Dorian for over a decade, during which time I have witnessed his remarkable growth into a highly skilled and independent Full Stack Developer. From the early stages of his career to his current role, Dorian has consistently demonstrated an ability to deliver high-quality solutions that not only meet but often exceed expectations. His technical expertise spans a wide range of technologies, and his ability to adapt to new challenges and frameworks is truly exceptional. What sets Dorian apart is his maturity and efficiency in delivering results. He has become a programmer who not only writes exceptional code but also understands the broader context of the projects he works on. His ability to independently manage complex tasks, solve problems proactively, and deliver polished, scalable solutions makes him an invaluable asset to any team. I highly recommend collaborating with Dorian, as his professionalism, reliability, and technical skillset make him a standout in his field.
WM
Founder & CEO @Huntt & @Synapsell

Products

I'm planning to add digital tools and automations here. The first one's in the works. Check back soon.

Contact