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Thomas Demian

@demiant

Senior solution architect and developer combining backend microservices and quantitative modeling to deliver secure, scalable systems.

Hungary

Message

What I'm looking for

I’m preparing a professional shift into modern ML/AI using Python, and I want a role where I can get hands-on experience with contemporary ML and AI libraries—while leveraging my proven microservices and solution architecture background.

I’m a senior solution architect and developer with deep experience spanning microservice back-end design, cloud-based delivery, and quantitative finance engineering. I’ve designed and coordinated back-end modules in GCP-based microservice architectures, including data structures, interfaces, load balancing, and performance/stress testing, and I’ve supported digital transformation efforts such as security gateway onboarding and OCR/OIDC integrations.

Earlier in my career, I built valuation and risk model tooling for structured credit derivatives and automated trading research, mentoring and interviewing new team members along the way. Today, after a voluntary career break, I’m focused on preparing a professional shift by learning the Python ML/AI ecosystem and gaining hands-on experience with modern ML and AI libraries.

Experience

Work history, roles, and key accomplishments

Erlang developer

OTP Hungary

May 2023 - Oct 2024 (1 year 5 months)

Introduction of Single Market trading platform covering FX and equities.
Programming: erlang, riak (distributed noSQL DB), graphQL, jenkins;bitbucket, VS code, jira,
confluence

Erlang Backend Development Git

Solution Architect

iCell

Jan 2022 - Apr 2023 (1 year 3 months)

Designed back-end ticket, vehicle, and notification modules for a toll management platform in a GCP microservice architecture, defining data structures, interfaces, and load balancing. Acted as product owner, translating business requirements into user stories, acceptance criteria, and test cases, and coordinated integrations across multiple delivery teams and vendors.

Solution Architecture Microservices GCP Java Docker Kubernetes Agile Scrum Jira Load Testing

Solution Architect

Vodafone

Jun 2020 - Jun 2021 (1 year)

Delivered technical solutions after UPC fusion, covering security gateway capabilities such as camera-based onboarding, OCR, and OIDC integration. Designed component interfaces per in-house integration principles and participated in vendor tender/proposal technical evaluations.

Solution Architecture Security Gateway Integration Camera Onboarding OIDC Interface Design Agile Scrum

Scala Developer

WST

May 2018 - Jul 2019 (1 year 2 months)

Built back-end services for an international insurance company, implementing microservices with Scala, Play Framework, and GraphQL (Sangria). Developed database access with Slick for MSSQL and integrated event-driven messaging using Kafka within an Agile/Scrum workflow.

Scala Play Framework Slick GraphQL Sangria Kafka Docker MSSQL Microservices Agile Scrum

Quant Developer

Morgan Stanley

Jun 2013 - Jun 2016 (3 years)

Developed and maintained valuation and risk models for structured credit derivatives. Built trader-facing cross-asset GUI components and improved performance of a Q-based data server using KDB partitioned tables and Scala interoperability.

KDB Scala Structured Credit Valuation Risk Modeling GUI Development Partitioned Tables Garbage Collection Tuning kx Interfacing JDBC

Research Assistant (Trading)

GusGus AB Hungarian Branch Office

Oct 2007 - Feb 2009 (1 year 4 months)

Automated equity trading on NASDAQ and conducted research on low-frequency market models, including European option valuation and stochastic volatility approaches. Studied hedging and Greeks, performed statistical model fitting/backtesting on time-series, and researched American order matching systems and NASDAQ deep-book data (FIX, TotalView-ITCH).

C++LaTeX Stochastic Volatility Models Black Scholes Greeks and Hedging Time Series Backtesting FIX and TotalView ITCH Gnuplot BASH

Education

Degrees, certifications, and relevant coursework

BME (PhD)

Doctor of Philosophy (PhD) not completed, Computer Science

2010 - 2013

Grade: 3.8

Activities and societies: Education, Research, Publication

PhD in Computer Science (not completed) focusing on development of an upper ontology and graph-based knowledge representation. Worked with OWL and Common Logic, using semantics based on first-order logic and description logic.

Budapest University of Technology and Economics

Master of Science (MSc), Technical Informatics

2001 - 2006

Grade: Excellent

MSc in Technical Informatics at BME, with a thesis on fitting Markov traffic models and finding PH-type representations for matrix exponential distributions using MATLAB. Coursework included linear algebra, queuing theory, signal processing, probability and stochastic processes, and IT security; received grade: Excellent.