Kacper is available for hire
Hire KacperKacper Skory
Verified Expert in Engineering
Software Developer
Location
Poznań, Poland
Toptal Member Since
May 10, 2016
Kacper is an experienced Java developer with strong AWS skills. Focused on software craftsmanship, he always stays up to date with the best technologies and solutions. Past employers include Sony as well as startups and companies involved in fintech and banking. He has high-availability system and big data experience. He's flexible and adaptable and has lived and worked in three different countries as well as with people from all over the world.
Portfolio
Corsearch
SQL, MongoDB, Docker, Kubernetes, Apache Kafka, Spring Boot, Java
Payworks
Jenkins, Git, Apache Maven, REST, Amazon S3 (AWS S3), Redis...
Coders Lab
Hibernate, Spring, Java
Experience
Availability
Part-time
Preferred Environment
Amazon Web Services (AWS), Java, Git, IntelliJ IDEA, Linux
The most amazing...
...application I've coded doesn't have any servers at all and scales without limits!
Work Experience
Senior Java Developer
2019 - 2019
Corsearch
- Worked on a scalable, robust, performant trademark search engine. Joined the team to help to meet the deadlines and requirements.
- Contributed to the development of a data platform for a central data source for other applications. Most work was done in the areas of data ingestion and services for serving data.
Technologies: SQL, MongoDB, Docker, Kubernetes, Apache Kafka, Spring Boot, Java
Senior Java Engineer
2018 - 2019
Payworks
- Worked on the payment gateway technology for the point of sales as a member of the core "payments" team. Realized multiple projects within a platform such as adding support for new alternative payment methods or new features related to card payments. The application is processing credit card payments through many different acquirers globally.
- Focused on high availability and resilience as key factors.
Technologies: Jenkins, Git, Apache Maven, REST, Amazon S3 (AWS S3), Redis, Amazon Simple Notification Service (Amazon SNS), Amazon Simple Queue Service (SQS), Amazon DynamoDB, Cucumber, Graylog, Grafana, Rancher, Docker, Microservices, Spring Boot, Spring, Java
Part-time Mentor and Lecturer at Java Programming Course
2017 - 2018
Coders Lab
- Mentored students during the whole full-time Java programming course, helping with any problems, checking exams, giving workshops, and providing technical guidance.
- Taught Java classes focused on practice.
- Shared knowledge and experience with junior Java developers.
- Received great feedback from students who were extremely happy with the training.
Technologies: Hibernate, Spring, Java
Full-stack Engineer
2016 - 2018
NDA (via Toptal)
- Worked on a social media analysis application hosted entirely on Amazon Web Services, mostly in serverless fashion. The application was feeding Elasticsearch with large volumes of enriched data coming from social media platforms; Elasticsearch was then used for performing various analysis and searches.
Technologies: Jenkins, Git, Apache Maven, REST, Spring, Amazon EC2, Amazon S3 (AWS S3), Amazon ElastiCache, Amazon Kinesis, AWS CloudFormation, Amazon API Gateway, Amazon DynamoDB, AWS Lambda, AngularJS, Scala, Java 8, Elasticsearch
Senior Software Engineer
2015 - 2016
Tesco Bank
- Realized three different projects within credit card applications, created new functionalities, and improved the user experience.
- Developed new functionalities for confirming the identity and digital signatures in loan applications.
- Worked on a platform upgrade project, rebuilding the platform in order to get rid of the obsolete technologies.
- Helped with introducing Docker.
- Stabilized and improved very brittle and slow Cucumber tests and improved CI.
Technologies: Gradle, Jenkins, Git, JBoss, REST, Cucumber, Docker, Spring, Scala, Java
Java Developer
2014 - 2015
KBC Bank and Insurance
- Developed new services at the mid-tier level for the new loan web application.
- Helped the front-end team create the AngularJS application.
- Greatly improved CI, introduced Jenkins to the team, configured Jenkins jobs, and created a CI environment for the development team, allowing them to perform one-click releases to the test environment. It greatly improved the performance of the team.
- Worked closely with the mainframe and front-end teams, to understand both team requirements and limitations.
Technologies: Jenkins, Git, AngularJS, REST, Apache Maven, Apache Tomcat, Spring, Java
Java and Scala Developer
2014 - 2014
Sony
- Developed the global unified account integration project for Playstation and other platforms.
- Used Cucumber tests, GitHub code reviews, and Jenkins CI to ensure the project stability and quality.
- Worked with the distributed team working in different time zones (Europe and USA).
Technologies: Splunk, Jenkins, Git, Cucumber, Spring, Scala, Java
Java Developer
2012 - 2014
Espeo Software
- Designed, developed, delivered, and maintained a web portal for a major Polish university. It included direct communication with the end client, planning and design of solutions, implementation, profiling, and optimizations and installations.
- Designed and developed the educational platform for a language school as part of an Agile team.
- Developed parts of a real estate management system. Joined in the end phase of the project to help to get out from a hard situation and finish the project in time.
- Created a collaboration platform. Designed and developed parts like authentication with Google OAuth, integration with Google Drive, and interactive task board with live updates using websockets.
- Worked on proof-of-concept mobile applications using Titanium.
- Guided junior developers, helping them to develop their skills and perform their job.
Technologies: Apache TomEE, Linux, Varnish, Apache, Apache JMeter, Jenkins, Git, CAS, WebSockets, Guice, GlassFish, Apache Tomcat, Hibernate, Spring, AngularJS, Solr, JOOQ, JEE, REST, Java
Java Developer
2010 - 2012
Verax Systems
- Developed new functionalities for the company's key product and network management system.
- Maintained the existing functionality of the system, fixed bugs, and collaborated with the testers.
- Worked both on the back end (Java, Spring, Hibernate, Oracle DB) and front end (Flex).
- Developed a proof-of-concept application for generating and consuming one-time passwords on mobile phones and PCs. Written in Java ME and C++.
- Helped new employees with initial setup.
Technologies: Flex, Ant Design, Apache Maven, Oracle, Apache Tomcat, Hibernate, Spring, Java
Experience
Pulse by Payworks
https://payworks.com/Payment gateway technology for the point-of-sales system. Processing credit card (and some alternative methods) payments through many different acquirers globally. High availability and resilience is one of the key factors.
Global Unified Accounts for Sony
Integration project for PlayStation and other devices and platforms.
Tesco Bank Credit Cards
Credit card applications and management.
Tesco Bank Loans
Loan applications, digital signatures, and anti-impersonation checks.
Collab
Collaboration platform with knowledge sharing, file sharing, video conferences, interactive board with live updates, and integrations with Google's services (OAuth, Google Drive, Google Docs).
KBC Loans
Web application for applying for loans, digital signatures, and credit checks.
Supermemo
Online educational platform for a language school.
eKontakt
Portal for a major Polish university.
Network Management System
Complex system for monitoring and managing networks and network devices.
Skills
Languages
Java, Scala, SQL, Java 8, JavaScript
Frameworks
Spring, JUnit, Spring Boot, Swagger, Hibernate, Jersey, Ant Design, Flex, Guice, Apache Spark, AngularJS
Tools
Amazon Simple Queue Service (SQS), Amazon Simple Notification Service (Amazon SNS), AWS CloudFormation, AWS SDK, Git, IntelliJ IDEA, Amazon Cognito, AWS IAM, Amazon CloudWatch, Apache Tomcat, Jenkins, Apache Maven, Cucumber, Grafana, Graylog, Apache, Varnish, Splunk, Amazon ElastiCache, Solr, Gradle, JVisualVM, Apache JMeter, Jetty
Paradigms
Test-driven Development (TDD), Scrum, Object-oriented Programming (OOP), REST, Agile, Functional Programming, Agile Software Development, Behavior-driven Development (BDD), Microservices
Platforms
AWS Lambda, Amazon Web Services (AWS), Amazon EC2, Docker, Linux, Kubernetes, Apache Kafka, JEE, Rancher, Oracle, JBoss, Heroku
Storage
Amazon DynamoDB, Elasticsearch, NoSQL, Amazon S3 (AWS S3), PostgreSQL, MySQL, Redis, MongoDB
Other
Amazon Kinesis, Amazon API Gateway, GlassFish, WebSockets, CAS, Apache TomEE
Libraries/APIs
JOOQ
Education
2008 - 2011
Bachelor of Science Degree in Computing
Poznan University of Technology - Poznan, Poland
Certifications
APRIL 2017 - APRIL 2020
AWS Certified Developer – Associate
AWS
APRIL 2017 - APRIL 2020
AWS Certified Solutions Architect – Associate
AWS
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