
Theodosis Katsoulis
Lead Software Engineer | .NET & Angular
Salary / Daily rate
Thessaloniki, Greece
Freelance, open to permanent contract
Remote only
Skills
Languages
About me
Intro
Lead Software Engineer with 5+ years architecting full-stack solutions using .NET, Node.js, and Angular. Built production monitoring systems, ecclesiastical management platforms, and enterprise applications serving hundreds of users. Specialized in microservices architecture, DevSecOps protocols, and translating complex business requirements into scalable technical solutions.
Work experience
Lead Software Engineer
Theka.Dev
Feb 2019 - Present
7 years 9 months
Thessaloniki, Greece
I architected and deployed comprehensive full-stack web solutions leveraging .Net, Node.js, Express, HTML/CSS, fortified by robust REST APIs with SQL/NoSQL DBs and Angular. Engaged in meticulous Customer Success Consulting, forging strong relationships, and delivering exceptional service. Major Projects: • Freelance Contracts • PMPC - A cutting-edge production monitoring and procedures calculating application, predicting precise material requirements for each production batch for GSC Co. • OnlineMenu - An online menu app for HORECA companies that customers can access and view all menu items, whilst the management can edit, update and modify the menu via a comprehensive dashboard. • Metropolis Scheduler (Mistiria.gr) - Web solution tailored for ecclesiastical metropolises and relevant parties, facilitating the submission of applications for weddings and baptisms. This tool allows priests to effectively handle all elements of these sacraments, including financial, scheduling, assignments, chapels, calendar coordination, and availabilities.
Software Engineer
iteam Technology Solutions S.A.
May 2024 - Mar 2025
11 months
Athens, Greece
Skills: Microservices · Software Infrastructure · Azure DevOps · .NET Core · ASP.NET · Angular
.Net Technical Expert
DIRS21 by TourOnline AG
Nov 2023 - Jan 2024
3 months
70 Stuttgart, Germany
(3 month fixed contract until Jan 31, 2024) • Provided .Net technical expertise in a contract role, supporting the Connectivity (TEX) team. • Handled and resolved code malfunction tickets, ensuring smooth operation of production projects. • Managed RabbitMQ queues, troubleshooting issues related to consumer requests/responses and queue performance. • Led the transition from traditional SQL stored process handlers to direct senders’ approach, aligning with the company’s infrastructure and service channels with hundreds of live users transferred to the new services.
Software Engineer
MIK3
May 2023 - Oct 2023
6 months
Thessaloniki, Greece
• Executed a pivotal upgrade of the Back-Office and Mobile MCM Facilities Inspection Application, single-handedly driving the transformation process. • Engineered SQL Scripting Automations to streamline DB migrations within the application, thereby ensuring frictionless data model transitions for end-users. • Operated as the central liaison for stakeholders and clients, translating their narratives and ambitious tasks into tangible, high-value products. • Harnessed prior academic and professional knowledge in HACCP and ISO, innovatively automating segments of the mandatory monthly reports dictated by these principles.
Software Engineer
Hellenic Army
Mar 2021 - Dec 2021
10 months
Greece · On-site
‣ Developed three major solutions for army procedures, including automation, arsenal and personnel management. ‣ Managed up to five projects simultaneously under pressure and delivered them on-time. ‣ Successfully transformed an application into a commercial-grade product, Online Menu, which was adopted by the KAAY Ag. Triados Army Unit. ‣ Zero Tolerance DevSecOps with zero trust protocols, multi-level authentication, and access control to sensitive data by conducting extensive security audits.
Sales & Financial Director
GSC Co.
Feb 2013 - Mar 2019
6 years 2 months
Thessaloniki · On-site
• Directed a formidable team of 12 professionals, propelling over €1.6M in sales, amplifying organic growth by an impressive 12%, and curbing unnecessary expenses by 8%. • Scrupulously audited and upheld all financial facets of the company to align precisely with the Greek and European Accounting Standards. • Spearheaded all financial and accounting endeavors, guaranteeing impeccable compliance and precision in both reporting and execution. • Bridged the gap between Business Partners and high-value customers, successfully securing a substantial funding of €800K for large-scale capital projects within a single year.
Education
The Open University
Software Development for Enterprise Systems
2023 - Present
3 years 3 months
University of Thessaly
Bachelor's degree
University of Thessaly
Master's degree
ReatCode: The School of Programming
Java Backend Development