Hello — I'm Andreas Petsas.

I'm a senior full-stack engineer — .NET and React, mostly across fintech and enterprise work. I like the unglamorous parts of the job: the migration nobody wants, the test suite that finally catches something, the third rewrite that reads clean. Off the clock I'm usually outside or halfway into a side project; the more human side of me lives one click away.

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Resume

Experience.

Senior Software Engineer
Contributed to the design and development of a blockchain-based food traceability system using .NET 7, Blazor, and PostgreSQL. Owned the maintenance of a cross-border remittance processing application with cryptocurrency support, delivering three successive POC versions and integrating external providers including Sumsub for KYC and payout providers. Contributed as a full-stack developer to 3 R&D initiatives in renewable energy and maritime digitalization, supporting the team's blockchain-enabled solutions with research partners. Mentored a graduate-level developer and helped establish C# design best practices for a 5-person engineering team, earning a promotion from mid-level to Senior Software Engineer. Currently deepening expertise in system design and architecture.
ELECTI Ltd.
Jan, 2024 - Present
.NETReactPostgreSQLPlaywrightDockerKubernetes
Full Stack Software Developer
Migrated a legacy VB.NET application to .NET 6 and transformed the monolithic system into a microservices architecture using containerization for scalable, independent deployments. Maintained a React Native mobile application for iOS and Android, implementing new features and optimizing cross-platform user experience. Integrated multiple external APIs including QuickBooks, Stripe, and Amazon Location Services alongside AWS services like DynamoDB, Lambda, and API Gateway. Managed cloud infrastructure across Azure (Kubernetes Service, Pipelines) and AWS while optimizing WordPress client websites for SEO.
Svelta Courier Ltd. (now EasyCourier, Easy Group)
Sep, 2022 - Dec, 2023
.NETReact NativeMySQLMongoDBAWSAzureWordPress
Junior Software Developer
Collaborated with external consulting partners to analyze business requirements and translate them into scalable technical solutions within an Agile environment. Developed a continuous integration pipeline using GitHub Actions, accelerating deployment cycles and improving code quality assurance. Integrated external APIs including Twilio, HubSpot, Ideal Postcodes, and Onfido for communication, CRM, and identity verification capabilities. Optimized search engine visibility and contributed technical documentation to improve knowledge sharing and onboarding for the development team.
Octta
Oct, 2020 - Aug, 2022
.NET CoreReactAWSMySQLRedisGitHub Actions