Ivan is available for hire

Ivan Gavrilov

Verified Expert in Engineering

Software Developer

Location

Nizhny Novgorod, Nizhny Novgorod Oblast, Russia

Toptal Member Since

February 11, 2016

Ivan is a professional full-stack web developer with more than 12 years of design experience in different areas. His primary focus is on creating secure APIs and modern web app solutions. He's ready to deliver high-quality, well-tested, and documented code. Ivan is an open and communicative person and prefers to work on big serious projects as the lead tech.

Python Flask Django Test-driven Development (TDD)Linux JavaScript Agile Software Development Model View Controller (MVC)PostgreSQL Redis REST APIs Underscore.js Backbone.js Bootstrap 3 Marionette.js

Portfolio

Granicus (via Toptal)

Amazon Web Services (AWS), Python 3, GraphQL, RQ, PostgreSQL, AWS Lambda...

RoomDots (via Toptal)

Amazon Web Services (AWS), SQLAlchemy, Celery, Django, Python

Mera

C#, JavaScript, PostgreSQL, Tastypie, Django, Python

Experience

Python - 11 years PostgreSQL - 8 years REST - 8 years Scrum - 6 years Flask - 6 years Django - 5 years Tastypie - 4 years

Availability

Part-time

Preferred Environment

Git, Vim Text Editor, MacOS

The most amazing...

...project I worked on is a back-end application for a POS system with more than 5,000 customers.

Work Experience

Back-end Software Engineer

2017 - 2022

Granicus (via Toptal)

Developed various back-end application components as a team member, including REST and GraphQL APIs.
Created microservice using Serverless Framework and AWS Lambda.
Prepared technical documentation and architected new components.
Integrated the product with third-party services such as Stripe, Twilio, Mailgun, and Lob.

Technologies: Amazon Web Services (AWS), Python 3, GraphQL, RQ, PostgreSQL, AWS Lambda, Stripe API, Flask, Twilio API, Asyncio

Full-stack Python Developer

2016 - 2017

RoomDots (via Toptal)

Created and supported user API using Django and DRF.
Created and supported high-load server-side application for collecting data from various data sources and monitoring the service.
Created integrations with third-party services.

Technologies: Amazon Web Services (AWS), SQLAlchemy, Celery, Django, Python

Senior Software Engineer | Mentor | Scrum Master

2012 - 2016

Mera

Supported and improved a cloud web-based back-end application for a POS system using Python and Django.
Created and supported REST API endpoints using Django and Tastypie.
Created a JavaScript object-editor base app and performed the implementations using Marionette.js.
Worked as a mentor for project newcomers.
Performed many technical interviews.
Created a distributed test-runner for the QA team.
Created a client app for an automated device testing system (including high-level design, low-level design and user manuals) using Python.
Implemented a PubNub integration.

Technologies: C#, JavaScript, PostgreSQL, Tastypie, Django, Python

Firmware Support Engineer

2010 - 2012

Auriga

Created a warehouse monitoring system based on Python scripts and Nagios.
Supported firmware upload-over-wifi scripts.
Wrote some Bash scripts.
Developed a warehouse map generator.
Created unit tests.

Technologies: Bash, Python

Associate Software Engineer

2010 - 2010

Teleca

Created a power-on/off application for the new BMP-based smartphone using C programming language.
Supported a status-bar application.
Supported the legacy devices code base.
Resolved a bunch of defects in the old device software using JTag.
Created internal scripts using Python.

Technologies: C

Experience

Cloud-based POS Application

As a back-end application team member, I was developing an API for one of the leading market players. It was included first on the list of Business News Daily's "Best iPad POS Systems." In 2013, it was chosen as the Best Retail App in the Business at the Tabby Awards.

Test Automation System

A fully automated test platform for hardware and firmware testing.

Technologies used: Python, C#, PubNub, and DevTest.

Time Management System

This project is aimed to track employees' work time in a big factory. I developed the server part which communicates with the JavaScript front-end and the Android app through a REST API.

Technologies used: Flask (Python web framework), MySQL, and Sphinx documentation.

Admin Web App for an iOS Delivery Platform

Web application for convenient data administration. The data is stored in Parse.com service. I also did some integration with BrainTree payment service. Created a small library for fast communicating with Parse.com with the ability to manage related objects by demand.

Technologies used: Python/Flask, BrainTree, and Bootstrap 3.

Salary Calculator

https://bitbucket.org/igavrilov/salarycalculator

A friend of mine asked me to create a simple project for his degree in economics. This is a working application aimed to manage employees in an organization and calculate their salaries based on worked hours, vacation, absence and etc.

Technologies used: Python/Django, Bootstrap 3, and an XLSX export library.

Skills

Languages

Python, JavaScript, Bash, C, C#, Python 3, GraphQL

Frameworks

Flask, Django, Bootstrap 3

Libraries/APIs

Tastypie, SQLAlchemy, Marionette.js, Underscore.js, Backbone.js, RQ, Stripe API, Twilio API, Asyncio, REST APIs

Tools

Vim Text Editor, Git, Mercurial, Celery

Paradigms

Test-driven Development (TDD), REST, Scrum, Agile Software Development, Model View Controller (MVC)

Platforms

Linux, MacOS, Amazon Web Services (AWS), AWS Lambda

Storage

PostgreSQL, Redis

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