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Ernestas Romeika
Verified Expert in Engineering
Software Developer
Helsinki, Finland
Toptal member since March 1, 2017
Bio
Ernestas has over 10 years of experience working with .NET-based applications. He graduated five years ago with a bachelor's degree in software engineering. He has primarily been working on web-related projects in both the front and back end. Ernestas is always up for a new challenge.
Portfolio
BioReference & Genedx/Sema4
C#, SQL, .NET, Postman, REST APIs, HIPAA Compliance...
Caterpillar
C#, .NET, .NET Core, Entity Framework Core, Azure Service Bus, REST APIs...
Equiniti (Contract)
Identity Server, Redis, Entity Framework Core, GraphQL, RabbitMQ, .NET...
Experience
- C# - 11 years
- Entity Framework - 7 years
- Microsoft SQL Server - 6 years
- Azure - 5 years
- Angular - 4 years
- Microservices Architecture - 4 years
- .NET Core - 4 years
- GraphQL - 2 years
Work Experience
C# Senior Software Engineer
2022 - 2023
BioReference & Genedx/Sema4
- Maintained Iguana WCF server for transporting HL7 data from laboratories to healthcare providers.
- Designed and developed REST-based communications between the main application and a laboratory information management system (LIMS).
- Utilized MuleSoft's Anypoint system for system monitoring and API documentation.
- Updated and optimized existing SQL stored procedures.
- Created and executed database migration scripts (SQL) and performed deployments for UI (Angular) servers (Linux), back-end systems (C#), administrative tools (C#), and cron job services (C#).
Technologies: C#, SQL, .NET, Postman, REST APIs, HIPAA Compliance, HIPAA Electronic Data Interchange (EDI), C#.NET, Back-end, RESTFul APIs
Senior .NET Developer
2020 - 2021
Caterpillar
- Led the effort to migrate the legacy codebase to .NET core.
- Participated in migrating the legacy plain JavaScript and HTML pages to Angular views.
- Developed an image processing process and integrated it with other CAT services.
Technologies: C#, .NET, .NET Core, Entity Framework Core, Azure Service Bus, REST APIs, C#.NET, Kubernetes, Back-end, RESTFul APIs
Senior .NET Engineer | Architect
2019 - 2020
Equiniti (Contract)
- Built a web application to help the company with asset reunification, locating lost share and stock owners and their relatives, using .NET.
- Integrated the app with the existing company tools.
- Traveled to the US to set up local development environments and learn about the on-site team and their business model.
- Handled the implementation of complex accounting calculations.
- Implemented GraphQL endpoints for all requests to provide flexible front-end development.
Technologies: Identity Server, Redis, Entity Framework Core, GraphQL, RabbitMQ, .NET, REST APIs, React, Node.js, C#.NET, Kubernetes, Amazon Web Services (AWS), Back-end, RESTFul APIs
.NET Software Engineer
2018 - 2019
Blackboard (via Toptal)
- Developed the new microservices for various back-end needs and supported existing microservices.
- Implemented and supported Postman tests.
- Supported and implemented unit tests with MOQ.
- Maintained the Jenkins deployment scripts.
- Implemented and supported messaging between microservices via Azure Service Bus and Azure Event Hub.
- Generated and validated cryptographic keys, assigning them to a specific application and storing and retrieving them from the Azure Key Vault.
Technologies: Postman, Swagger, Artifactory, Jenkins, Octopus Deploy, Microservices, Moq, Blob Storage, Azure Table Storage, Azure Cosmos DB, Azure Key Vault, Azure Event Hubs, Azure Service Bus, .NET Core, REST APIs, C#.NET, Back-end, RESTFul APIs
Front-end Angular Developer
2017 - 2018
South African Tourism (via Toptal)
- Developed the front end features for the South African Tourism portal.
- Created a real-time weather component that tracked different regions in South Africa.
- Implemented a flexible and scalable UI design to support over 30 different languages.
Technologies: TypeScript, SCSS, Webpack, RxJS, Redux, Angular, Kubernetes, Stripe, RESTFul APIs
.NET Software Engineer
2016 - 2017
Intermedix
- Upgraded the architecture of the project.
- Handled the decoupling of legacy code dependencies.
- Moved project towards a microservice-based approach.
- Introduced end-to-end testing and unit testing to the project.
- Improved existing data flows.
- Introduced data backups.
- Refactored front-end JavaScript files to TypeScript.
- Introduced Entity framework code-first migrations.
- Handled deployment procedures (Jenkins configs, MSBuild tasks).
- Monitored overall production environment stability (Dynatrace).
Technologies: Dynatrace, Gulp, Jenkins, PhantomJS, Selenium, Entity Framework, Microsoft SQL Server, TypeScript, AngularJS, Web API, .NET, REST APIs, HIPAA Compliance, C#.NET, Back-end, RESTFul APIs
.NET Software Engineer
2015 - 2016
Baltic Amadeus
- Operated in an agile environment within a team of twelve people to create an accounting system for the Swedish market and legal system.
- Developed a solo project for a restaurant food ordering system.
- Integrated communications between POS machines, databases, and web services.
Technologies: Entity Framework, Microsoft SQL Server, AngularJS, Windows Communication Foundation (WCF), ASP.NET MVC, .NET, Telerik, REST APIs, C#.NET, Back-end, RESTFul APIs
.NET Developer | Co-founder
2013 - 2015
QuatroDev
- Operated in an agile team environment.
- Developed a scalable internal system for a car insurance company.
- Built a smartphone app for a well-known Swedish photo crowdsourcing startup.
- Supported a native Windows 8 application that manages MS Office templates.
- Contributed to the development of an internal proprietary core codebase.
- Deployed the .NET Azure applications, Azure Blob storage, MS SQL, and RavenDB instances.
Technologies: Orchard, Azure, RavenDB, Web API, ASP.NET MVC, .NET, REST APIs, C#.NET, Back-end, RESTFul APIs
.NET Developer
2012 - 2013
Softdent
- Supported a mobile web application intended for pharmacy agents.
Technologies: ASP.NET MVC, .NET, REST APIs, HIPAA Compliance, C#.NET, Back-end, RESTFul APIs
Web Developer (Intern)
2012 - 2012
Net Frequency
- Assisted with team tasks, gaining experience, and learning the ins and outs of the industry.
Technologies: JavaScript, CSS, HTML, MySQL, Apache, PHP, Back-end
Web Developer
2011 - 2012
Freelance
- Worked on various short-term web projects and applications.
Technologies: Zend Framework, PHP, ASP.NET MVC, .NET
Junior .NET Developer
2009 - 2009
Prografika
- Worked on a finance management system.
Technologies: Windows Presentation Foundation (WPF)
Project History
Incremental Randomized Delaunay Triangluation
Back in 2013, while I was doing my bachelor studies, I somehow talked my way into the university office letting me take a masters-level course on computational geometry. This was my final project for that course. I implemented incremental randomized Delaunay triangulation in optimal complexity, which was a bit tricky. You can see explanation (in Lithuanian), diagrams, and code on the link I've shared.
Education
2011 - 2015
Bachelor's Degree in Software Engineering
Kaunas University Of Technology - Lithuania
Skills
Libraries/APIs
Entity Framework, REST APIs, Azure Blob Storage API, jQuery, React, Web API, PhantomJS, RxJS, Moq, Node.js, Stripe
Tools
Jenkins, Gulp, NPM, Bower, Visual Studio 2019, ReSharper, Git, Dynatrace, Apache, Webpack, Azure Key Vault, Artifactory, Postman, RabbitMQ
Languages
C#, C#.NET, TypeScript, HTML, CSS, JavaScript, TypeScript 2, GraphQL, PHP, SCSS, SQL
Frameworks
.NET Core, Angular, AngularJS, Entity, .NET, Bootstrap, ASP.NET MVC, OAuth 2, Selenium, Orchard, Windows Presentation Foundation (WPF), Zend Framework, Redux, Swagger, Entity Framework Core, Scaled Agile Framework (SAFe)
Paradigms
HIPAA Compliance, Agile, Kanban, Microservices, Microservices Architecture
Storage
Microsoft SQL Server, Azure Cosmos DB, MySQL, Azure Table Storage, Redis, RavenDB
Platforms
Azure Service Fabric, Windows, Azure, Telerik, Azure Event Hubs, Visual Studio Code (VS Code), Visual Studio 2022, Kubernetes, Amazon Web Services (AWS)
Other
Back-end, RESTFul APIs, HIPAA Electronic Data Interchange (EDI), Windows 10, Windows Communication Foundation (WCF), Azure Service Bus, Blob Storage, Octopus Deploy, Identity Server, Windows 11, Machine Learning
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