Hi, I'm Adam Kopeć!

• Writing Scala for the onlino casino domain

• Hired as Java developer, but transitioned to Scala after two months (no regrets),
• Development of a few microservices in Scala (ZIO, circe, akka-http, cats, scalatest + Kafka, sttp, Redis, Cassandra, PostgreSQL),
• Design of a configurable business process engine in Scala for a multi-tenant application,
• Constant architectural supervision of a multi-module, multi-container, multi-artifact sbt project – the trickiest part of the project was not the logic itself, but rather proper interface definition, layer design and module composition, because the features of the application were composable at runtime.
• Applying production-ready practices for high traffic – circuit breakers, monitoring, logging, tracing, full Kafka schema compatibility etc.
• AWS Architect certification during free time (in order to better understand the applications and more effectively leverage the AWS ecosystem),
• Working on CI/CD pipelines architecture (Amazon EKS, Kubernetes, Helm, Kaniko, Gitlab CI),
• Analyzing business requirements, writing RFCs, conducting interviews, running demos for management,
• Design of a simple, but modern, reactive API using Java 11, Spring Boot, Spring Cloud components.

• Leading the team of 8 people (responsible for development and maintenance of existing platform),
• Playing the architect role in a new, more modern project (developed by ~5 people, dealing with high volume of data and challenging SLA) – drawing diagrams, analyzing requirements and available tools, assessing risk, consulting with the development team and business analysts,
• Supervising and analyzing the impact of design changes made to the existing, legacy system,
• Gathering and analyzing business requirements, negotiating scope with business representatives of different company units and other teams,
• Successful introduction of the event storming practice to the company,
• Making code reviews, mentoring team members, making them familiar with the company business model and its technical practices, interviewing candidates,
• Communicating with external companies (data suppliers) and contractors,
• Popularizing the usage of Kubernetes in the company, refining CI/CD processes

• Java 8 and advanced SQL Server programming,
• Implementation of a large business application that was loading complex data structures into the system (more than a year of development, >50k LOC written alone),
• Technical design consultations (especially regarding lowering of the cross artifact dependency level, introduction of internal libraries, versioning scheme etc.),
• Debugging, analysis and refactoring of internal concurrency related algorithms and tools,
• International business and architectural meetings participation (in english),
• Supervising external contractor teams, defining requirements and making code reviews,
• CI/CD pipeline configuration (git, svn, maven, jenkins, gitlab),
• Participation in a group which aimed to introduce Docker and Kubernetes to the organization

• API development (from scratch in Java 8 on Spring Boot) – I was responsible for all architectural concerns (documentation maintenance and versioning, package structure, logging, cross-service request identification in logs, versioning, rate limiting etc.) and most of coding. I used Redis, Kafka, Apache Phoenix for HBase etc.
• Third party integration development (connected with payment collection and real-time data aggregation),
• Java services development (different features added to existing projects),
• Infrastructure automation with Ansible (provisioning, deployment and build scripts),
• Jenkins pipeline configuration,
• PHP application structure normalization (Vagrant introduction, build script creation, test reorganization),
• JavaScript widget development (sophisticated dynamic forms, written mostly in Backbone + Marionette) and some node.js development (mostly tools and fixes for existing services),
• Training of junior developers and interns, team mentoring, development workflow consultation.

• Playing a lead architect role in a team that worked on company’s flagship product – an in-house e-commerce platform. My work has been focused on transition from dedicated solution, that had to undergo major changes from project to project, into a framework with a consistent, but customizable domain model, that could handle many conceptually different systems.
• Participation in technical meetings with customers,
• Making diagrams and writing documents about the architecture,
• Training of junior developers,
• Knowledge crunching with customers, writing proposals, project boundary negotiations.

• Implementation of customer’s performance problem solution. Major architectural leap from ad-hoc, stored procedure-based calculations to an asynchronous, messaging-based solution built on the top of RabbitMQ. Development of a custom intermediate data generation algorithm for effective caching.
• Project and implementation of a sophisticated loyalty point calculation program, in some ways similar to Payback™. Project consisted of a calculation engine and an intuitive GUI written in JS, which provided a way to enter even very complex, custom rules.
• Project and implementation of an automated tool, that was able to merge product catalogs from many vendors. It was capable of handling many different protocols, mainly EDI-Wheel, EDIFACT INVOIC, SOAP and Xpartner. Challenges: queueing systems, different data models, event-driven programming, big range of data,
• Activities aimed at modernization of the company’s software development methodology. Introduction of formal code reviews and build automation procedures based on Phing and Jenkins.
• Conducting weekly internal trainings for coworkers. Topics: software engineering, Domain Driven Design, new technologies, elegant design patterns etc.

• Programming of e-commerce platforms and dedicated systems for key customers.
• Implementation of integration solutions and business rule modeling.
• Spreading of good software engineering practices: unit testing, object oriented design, refactoring.
• Extending the company’s framework with a DI container, event bus and other components.
• Maintaining legacy systems.

• Development of dedicated systems, challenges: XML-RPC, AMF, Lucene, Facebook API, Google Maps API, automatic e-mail responders, PDF generation, web-crawler design, payment systems integration (payu.pl, dotpay.pl) etc.
• Web server administration – deployment, PHP and SQL optimization, domain management.
• Main projects: http://pokaz.to/, http://www.preseller.pl/, http://frauscherboats.pl/, http://www.mountainapartments.pl/, http://ibhp.pl/, indexo.pl homepage and many automated SEO tools

Web programming with HTML, CSS and JS, SEO tools development