NIKITA NEFEDOV

senior software developer

10 years of programming experience in different programming languages.
A daily Linux user with the focus on terminal and CLI interfaces.

nefedov.work
inefedor@gmail.com
GitHub
LinkedIn
+31 6 19 79 16 43
Amsterdam, Netherlands

Personal qualities

Most proficient with backend programming and infrastructure. I like to focus both on the product and on technical side of my work. (closely understanding business needs and product domain)

Doing research rigorously before making a technical decision if I realize that I lack expertise in the problem at hand. That said you'll never find me in the analysis paralysis kind of situation.

Good at mentoring people, and helping Junior developers grow and multiply their value for the company. Using occasional pair programming for knowledge sharing, giving thorough explanation/analysis in PR reviews.

Past positions and companies

Senior Software Engineer at Picnic BV, Netherlands 2022-Present
Company
Picnic is the online grocery store operating in the Netherlands, Germany and France.
Responsibilities
I’m working on warehouse management system in Picnic, my work consists (in equal parts) of researching new features and working together with stakeholders on defining the scope and expectations, helping team members with technical and operational aspects, hands-on implementation of solutions, planning the implementation for projects that involve multiple people or teams.
Apart from my main responsibilities, I also contribute to the company-wide infrastructure (platform codebase, improving Kubernetes set up, CI, observability); I enjoy the hands-on work the most, but get on well with people, too.
Achievements
Founded a new team together with a tech lead, taking on an unstable PoC of a service and productizing it (re-architecting for long-term maintenance and new features, stabilizing, and working with operations teams on their adoption of it). Helped grow that team up to 9 engineers while the scope expanded.
Stabilized parts of the Warehouse Management System, which were causing incidents, significantly decreasing time spent by developers on support.
Led or developed many projects resulting in increased efficiency in the warehouses, most notably: simulating product demand to deliver the most relevant products to the pick locations in time (improved order completeness), setting up monitoring and alerting for WMS services (decreasing Mean Time to Ack for incidents).
Initiated a number of whole-org changes in infrastructure for more stable operation or increasing developer velocity: made fully zero-downtime deployments possible for all teams, organized Prometheus alert routes for teams, stabilizing contributions in the org-wide Java platform libraries.
Stack
Java 21, TeamCity, Spring 5, RabbitMQ, PostgreSQL (Aurora), Kubernetes, Terraform, Angular, JOOQ, AWS
Senior Software Engineer at BillForward, UK 2017-2021
Responsibilities
Making core contributions to the product, communicating with the team, with engineering manager and with all levels up to the CEO. Communicating with customers (large ones were Cloudflare and Docker). Doing devops and failure recovery.
Achievements
Finished a lot of projects in time and before the deadline. Led the refactoring effort which over time made it considerably easier for everyone to work with the codebase, my main metric was to decrease the time-to-market of new features by speeding up development with more manageable codebase. Led a series of migrations (GCP -> AWS, a DB migration and data migration) to cut infra costs, resulting in 60% savings on infrastructure without sacrificing availability. In a day skimmed through the syntax of Closure and made a patch to Metabase (which is written in Closure) to fix a bug, which was critical to have working for a large customer of ours quickly.
Stack
Java 16 (started with Java 8), Kotlin, Spring Boot 2, RabbitMQ, MySQL, Rancher, Jenkins, React, AngularJS, Elastic, ELK, JAX-RS, Jackson, JPA, Hibernate, EclipseLink, AWS (a lot of AWS optimization)
Senior Software Engineer at SocialKey, Russia 2015-2017
Responsibilities
Developing business logic, crunching users data into marketing segments.
Achievements
Improved overall engineering quality of the product, developed some high-throughput analysis implementations.
Stack
PHP 5-7, Symfony 2, Doctrine 2, RabbitMQ, MySQL, Elastic, React
API Developer at Namshi, UAE 2013-2014
Responsibilities
Developing one of the most widely used clothing stores in the Middle East, with its own logistics, similar to Asos.com
Achievements
Completely refactored large (main) test suite, cutting its runtime from about 1-1.5 hours to 10 minutes (~80% improvement), leading to shorter development cycles and thus shortening time to production of new features.
Stack
PHP 5, Symfony 2, Doctrine 2, RabbitMQ, MySQL
Software Developer at Creara / Nexters ($GDEV), Russia 2012-2013
Responsibilities
Implementing, together with another developer, an in-house ad-tracking platform for web-based games (games were the main product of the company) which was used to derive ROI of ads and other properties that people from marketing used heavily. After this project I was working on an internal HR-related platform.
Achievements
Implemented and design an internal people platform that was used for most internal things including payroll, leaves, bonuses, various approvals. It was done several weeks ahead of the deadline and continued to be successfully used after I left.
Stack
PHP 5, Symfony 2, Doctrine 2, RabbitMQ, PostgreSQL
Junior Developer, Russia 2010-2012
Responsibilities
Working at several IT companies as a Junior developer.
Achievements
Learned Symfony 2 and Doctrine 2 in my spare time, started poking with PHP internals and later contributed to PHP.
Stack
PHP 5, Yii, Symfony 2, Doctrine 2, RabbitMQ, PostgreSQL, MySQL

I am confident with

> Data
  • Optimization of PostgreSQL, MySQL and its derivatives. Queries, indexes, access patterns, underlying hardware and filesystem tuning
  • Analytical SQL
  • ETL pipelines and online DBMS migrations
  • S3 Parquet AVRO
  • Cassandra CockroachDB MongoDB
  • ElasticSearch, Sphinx/Manticore, Typesense and MeiliSearch
  • RabbitMQ ActiveMQ Kafka
> Programming
  • OOP, SOLID, other concepts like MVC, MVVM, Flux
  • Functional programming and ideas like GADTs HKTs
  • Java Kotlin C PHP Javascript TypeScript
> Frameworks and tools
  • Spring, JPA Hibernate EclipseLink JAX-RS Spring Data JDBC Java Collections + Streams + Concurrency
  • JUnit Spock Spring MockMvc Hamcrest Selenide
  • React Next.js Vue.js
  • Kubernetes Rancher Docker
  • Jenkins CircleCI GitHub Actions
  • Setting up ELK and log pipelines, APM, log correlation, Prometheus and Grafana