Kostas Alexopoulos

Senior Software Engineer | Python, Kotlin, TypeScript

@souperk

8 years building enterprise systems. I care about clean architecture, strong testing, and making teams more effective.

Projects

2021 - Present

An open-source, self-hosted personal productivity platform built on a microservices architecture. Loryth integrates task management, a knowledge base, grocery planning, journaling, and AI assistance into a unified system — designed for users who want full ownership of their personal data without relying on fragmented corporate services.

Feb 2024 (weekend project)

A PyCharm plugin that fixes type resolution for SQLAlchemy 2.0's Mapped[T] annotations. PyCharm incorrectly flags valid SQLAlchemy code as type errors — this plugin hooks into the IDE's type provider system to correctly resolve mapped attributes on both instances and classes, supporting features like @hybrid_property and @declared_attr. A weekend hack that picked up 20 stars on GitHub.

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Experience

Software Engineer

Plum

Nov 2024 - Present

1 year 3 monthsAthens (Hybrid)Full-time

Key Achievements

Led a cross-functional working group improving database performance, delivering measurable reductions in query latency and load.
Drove growth engineering initiatives for referrals and onboarding, building data pipelines, instrumentation, and experiments to enable data‑driven decisions.
Contributed to company-wide Kotlin adoption, creating guidelines, templates, and migration support.
Authored technical design documents and architecture decision records to align stakeholders and de-risk delivery.
Initiated and ran a knowledge-sharing program on SQLAlchemy best practices, raising code quality and consistency.
Mentored engineers and conducted technical interviews, improving hiring quality and team onboarding.
Collaborated closely with PMs and Designers to scope, plan, and deliver features end-to-end.

Python

Flask

SQLAlchemy

Celery

Kotlin

Kubernetes

Docker

Helm

PostgreSQL

RabbitMQ

git

Software Engineer

ForAllSecure

Dec 2021 - Jul 2024

2 years 9 monthsPittsburgh (Remote)Full-time

Key Achievements

Responded to production incidents as on-call engineer, maintaining service reliability across the operations rotation.
Modernized the web development stack using React and Chakra UI.
Researched the applications of Multi-Armed Bandit (MAB) scheduling for black-box fuzzing.
Took ownership of the job scheduling component, utilizing Python, Celery, and RabbitMQ.
Implemented automated performance benchmarking using Python and Jenkins.
Integrated over 500 open-source projects into Mayhem’s grey-box fuzzing solution.
Maintained and hardened third-party dependencies (RabbitMQ, PostgreSQL) in accordance with GameWarden’s cybersecurity guidelines.

Python

Flask

SQLAlchemy

Celery

TypeScript

React

Chakra UI

Kubernetes

Docker

Helm

PostgreSQL

RabbitMQ

git

Senior Software Engineer

SG Digital

Feb 2021 - Nov 2021

9 monthsAthens (Remote)Full-time

Key Achievements

Integrated authentication services across regional iGaming platforms using Python and Django, reducing partner onboarding time.
Built real-time service health monitoring with Python and Prometheus, providing observability across distributed microservices.
Implemented UKGC and MGA regulatory compliance controls, reducing compliance risk for regional online betting operations.

Python

Django

PostgreSQL

Software Engineer

i2s

Jul 2017 - Jan 2021

3 years 7 monthsAthensFull-time

Key Achievements

Refactored two projects from a monolithic architecture to a RESTful architecture.
Led the engineering effort to improve application performance in preparation for the merger of three major customers (C#, EntityFramework, SQL).
Modernized web interfaces by migrating from AngularJS to Angular and TypeScript, implementing best practices for responsiveness and accessibility.
Led the engineering effort for developing an IoT data collection and processing platform for aquaculture devices using .NET, Flask, and Angular.
Developed feed consumption prediction models using encoder-decoder neural networks with TensorFlow.
Improved software development practices by introducing a ticketing system (GitLab), introducing git for version control, and creating operations documentation.