Grzegorz Piwowarek

5.0

(2 reviews)

US$30.00

For every 15 mins

Sessions/Jobs

First 15 mins free for your first session

View Video

ABOUT ME

Lead Software Engineer | Trainer

I'm a passionate software engineer, trainer, international conference speaker, and a blogger (http://4comprehension.com) who cares about quality, craftsmanship, clean code and getting things done.

I am a committer in a few big open source projects. Besides this, I am a ex-lead technical editor at Baeldung where I used to be responsible for the technical correctness of almost all articles published between 2016 and 2018.

Codementor is a great place where I can help people and not corporations.

Sessions are risk-free. Simply put, if I don't manage to help you, you get a refund immediately.

If you need an on-site training, I'm there for you as well (EU, North America)

Polish, English

Vienna (+02:00)

Joined April 2017

EXPERTISE

Java

7 years experience

Java 8 Functional Programming Concurrent Programming Microservices

Kotlin

2 years experience

Backend development

Kotlin Spring Back-End

Spring

6 years experience

I've been working with Spring almost through my whole programming career. I have a good grasp of Spring MVC, Spring Boot, Spring Web, Spr...

I've been working with Spring almost through my whole programming career. I have a good grasp of Spring MVC, Spring Boot, Spring Web, Spring Data. I used to be a lead technical editor at Baeldung

Spring dataSpring webSpring Boot

REVIEWS FROM CLIENTS

5.0

(2 reviews)

Miles

January 2019

Brilliant as usual.

Miles

January 2019

Perfect. Grzegorz has a lot of knowledge on Kotlin and helped me with all my design decisions and questions. Will hire him again soon.

SOCIAL PRESENCE

GitHub

throwing-function

Checked Exceptions-enabled Java 8+ functional interfaces + adapters

Java

149

parallel-collectors

Parallel Collectors is a toolkit easining parallel collection processing in Java using Stream API.

Java

109

Stack Overflow

7823 Reputation

Community Posts

Beware of Kotlin's Null-Safety!

How not to shoot yourself in the foot using Java libraries!

Kotlin Collections API Performance Antipatterns

There are certain practices that can cause unnecessary time-complexity and object allocation overhead.

Beware of Java Stream API Habits when Writing Kotlin Code

Kotlin Collections are not lazy like Java Stream API is, and it has serious consequences!

EMPLOYMENTS

Lead Software Engineer

Casumo

2018-06-01-Present

Developing a highly-transactional event-sourced system comprising of more than 100 independent services. Refactored, clustered, and sca...

Developing a highly-transactional event-sourced system comprising of more than 100 independent services. Refactored, clustered, and scaled service responsible for backend-frontend communication. Saved engineers’ time and sanity by revising the recruitment process by introducing the additional recruitment stage that allowed to filter out candidates at the early stage. Organized and planned the initiative of building an external presence of the tech culture in the company in the community. Designed a highly-successful code challenge for JBCNConf/SpringIO promotion, and represented the company on prestigious international events like OracleCode Los Angeles and Devoxx.

Java

Spring

RabbitMQ

Java

Spring

RabbitMQ

Kotlin

CQRS

Event Sourcing

Trainer/Consultant

Bottega IT Minds

2018-01-01-Present

Comprehensive trainings covering advanced topics like Functional Programming in Java, Vavr,RxJava, Kotlin, and Effective Java/Clean Code ...

Comprehensive trainings covering advanced topics like Functional Programming in Java, Vavr,RxJava, Kotlin, and Effective Java/Clean Code practices.

Java

Spring Boot

Kotlin

Java

Spring Boot

Kotlin

RxJava

Software Engineer

Casumo

2018-02-01-2018-06-01

Refactored, clustered, and scaled service responsible for backend-frontend communication.

Java

RabbitMQ

Kotlin

Java

RabbitMQ

Kotlin