Yiğit is available for hire
Hire YiğitYiğit Özkavcı
Verified Expert in Engineering
Software Developer
Location
London, United Kingdom
Toptal Member Since
October 22, 2018
Since 2015, Yiğit has been developing apps with Ruby on Rails and working with Haskell and functional programming. An open-source enthusiast, he's developed his own programming language as part of his bachelor thesis and maintained a Haskell client for the DigitalOcean API. As an ex-Googler and SRE, Yiğit is known for his focus on the availability and reliability of the services he owns. Yiğit is also not new to the remote working scene, communicates extremely well, and loves TDD.
Portfolio
Shopify
Ruby on Rails (RoR), Linux, PostgreSQL, MySQL...
Google
C++, Java, Go, Python, Distributed Systems, Infrastructure, Fault Tolerance...
Picus Security
Amazon Web Services (AWS), Hydra, Unix, Linux, Haskell, PostgreSQL, Jenkins...
Experience
Availability
Part-time
Preferred Environment
Ruby on Rails API, TypeScript, React, PostgreSQL, Google Cloud, Heroku, Site Reliability Engineering (SRE)
The most amazing...
...thing I've worked on was leading the migration of production rollouts of a critical service in Google Cloud that was receiving +35M requests per second.
Work Experience
Senior Software Engineer
2022 - PRESENT
Shopify
- Led the effort to migrate the observability stack of the whole payments platform to Prometheus and Grafana. This included alerts, graphs, and SLOs.
- Built the 3DS support for credit card payment apps on Shopify along with two other colleagues.
- Led the backfill and dark launch phases of a major internal project for migrating critical payment app data between internal databases.
Technologies: Ruby on Rails (RoR), Linux, PostgreSQL, MySQL, Object-oriented Programming (OOP), JavaScript, Source Control Management
Site Reliability Engineer
2019 - 2022
- Held the position of an SRE for Google Cloud Service Infrastructure.
- Managed a rollout infrastructure migration with zero downtime for a service that receives more than 40 million queries per second.
- Led an internal team of four people as a part of my role.
Technologies: C++, Java, Go, Python, Distributed Systems, Infrastructure, Fault Tolerance, Design for Failure, Object-oriented Programming (OOP), Concurrent Programming, Linux, Source Control Management
Software Engineer
2017 - 2019
Picus Security
- Implemented a new license manager service that would help both DevOps and support for managing client licenses.
- Created a new attack module called scenario attacks that play between two node machines and performs, step by step, a series of vulnerability exploitations.
- Applied new messaging protocols for a multithreaded "engine" environment.
- Migrated a codebase from an old SQLite library to a new one by using Haskell's type safety.
- Co-created a Go library that has both client and server sides and can simulate a data exfiltration attack in the process of a scenario attack. Also integrated this Go library to our Haskell codebase and Nix architecture.
- Split our existing Jenkins end-to-end test suite into parts.
- Defined the dependencies in these separate parts and made it possible to have separate reports for each part of the end-to-end suite.
- Applied Nix's caching mechanism to optimize evaluation time for the suites.
- Created a token authentication mechanism solely for DevOps.
- Implemented a series of API endpoints for the DevOps team to help them automate their workflows.
Technologies: Amazon Web Services (AWS), Hydra, Unix, Linux, Haskell, PostgreSQL, Jenkins, Functional Programming, Docker, JavaScript, Source Control Management
Software Engineer
2016 - 2017
Paraşüt
- Designed a new subscription flow using finite automata modeling.
- Developed a customer management system for the support team using Coffee.js. The application is modeled as a tree and could be expanded to see the details.
- Integrated new data analytics using Amazon SNS and SQS for messaging, Firehose for the data flow, and Redshift as the database platform.
- Implemented new features with Ruby on Rails, a service object with a TDD principle with +96% test coverage.
- Created new libraries using Plain Old Ruby Objects (PORO) and introduced new abstractions using Ruby's metaprogramming features.
Technologies: Docker, Ruby on Rails (RoR), Ruby, Ruby on Rails 5, MySQL, Jenkins, Object-oriented Programming (OOP), Heroku, JavaScript, Source Control Management
Lead Developer
2015 - 2016
Evbana.com
- Maintained a Laravel back-end application, as well as the front-end.
- Created monitoring systems to constantly check up on the availability of our systems.
- Built various microservices including the ones for data integration and mail notifications.
- Discovered, with a team, a vulnerability and subsequently improved the security of the system by applying penetration testing for the continuous assessment of vulnerabilities.
- Created multiple services using service objects, including services for our Slack and MailChimp integrations.
Technologies: Amazon Web Services (AWS), Laravel, Ruby on Rails 5, Ruby, MySQL, Jenkins, Object-oriented Programming (OOP), Heroku, Docker, JavaScript, Source Control Management
Experience
Cenary
http://github.com/cenary-langI developed this programming language to write Ethereum smart contracts. It's written with Haskell and is currently usable for writing small smart contracts. It utilizes the Ethereum Virtual Machine and its instruction set behind the scenes.
The language utilizes the "Ethereum Yellow Paper" to act on the virtual machine.
The language utilizes the "Ethereum Yellow Paper" to act on the virtual machine.
Typed Webdriver
https://github.com/yigitozkavci/typed-webdriverWebdriver is a client library for Jenkins in Haskell. With Typed Webdriver, people are able to verify their XPath expressions and their capabilities at compile time. So basically, if you want to click to an element with the tag "span", your code won't compile.
DigitalOcean Haskell Client
https://github.com/inzva/DOHA Haskell client for using the DigitalOcean API.
Glow: A Toy Programming Language Written for LLVM
https://github.com/yigitozkavci/glowGlow is a programming language compiled with LLVM compiler architecture.
Haskell Client for Hurriyet API
https://github.com/yigitozkavci/hurriyet-haskellHurriyet was the top news provider at the time of this project's writing. This client library helps us use their API in Haskell.
Hoogle-It: A Chrome Extension for Haskell Documentation in the Browser
https://github.com/yigitozkavci/hoogle-itHoogle-It is a Chrome extension and after it is installed, it lets a user select a text containing a valid Haskell expression and then shows documentation for that text using the Hoogle API.
Tetrelm: A Tetris Game in the Browser Written in Elm
https://github.com/yigitozkavci/tetrelmThe title says it all, this is a toy game project where I wanted to learn Elm better by doing it, and the result was amazing.
Type-Level Dijkstra's Shortest Path
https://github.com/yigitozkavci/typelevel-dijkstra-spDijkstra's shortest path algorithm implemented at the type level. Basically, when the code compiles, before running it, it can give an answer to a graph's shortest path between two nodes.
PoseGenie
An iOS app that allows gymgoers to utilize AI in order to take more consistent poses. Whenever a user opens their cameras in order to take a pose, the app instructs them in various ways, including having them move their arms, legs, head, and other body parts in order to take the perfect pose.
I've used Ruby on Rails and SwiftUI for the back end and front end respectively. The back end is hosted on Heroku.
I've used Ruby on Rails and SwiftUI for the back end and front end respectively. The back end is hosted on Heroku.
Skills
Languages
JavaScript, Ruby, Haskell, TypeScript, Elm, Java, C++, Go, PHP, Python, Swift, Swift 5
Frameworks
Ruby on Rails (RoR), Ruby on Rails 5, Laravel 5, NestJS, Laravel, Hydra, Django, Express.js
Libraries/APIs
React, Ruby on Rails API, Twitter API, Facebook Open Graph API, Foursquare API
Tools
Jenkins, BigQuery, Google Cloud Console
Paradigms
Object-oriented Programming (OOP), Functional Programming, Concurrent Programming, Design for Failure
Platforms
Linux, Amazon Web Services (AWS), Docker, Unix, Heroku, iOS
Storage
PostgreSQL, MySQL, SQLite, Google Cloud SQL, Google Cloud
Other
Source Control Management, NixOS, Site Reliability Engineering (SRE), Systems Monitoring, Distributed Systems, Infrastructure, Fault Tolerance
Education
2013 - 2018
Bachelor's Degree in Computer Engineering
Boğaziçi University - Istanbul, Turkey
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