Diamantis Tziotzios

Software Architect

Athens, Greece

Personal Details

  • Birthday: 1989 February 24
  • Nationality: Greek

About Me

Engineering leader with 14 years of experience designing and delivering large-scale distributed systems, cloud infrastructure, and AI-first SaaS platforms. VP of Engineering at CITE, leading teams that deliver mission-critical solutions for banking, law enforcement, and private and public sector clients, including platforms handling millions of records and serving millions of users. Proven track record in architecting cloud-native systems with a focus on scalability, reliability, and compliance, and trusted to deliver solutions in highly regulated industries. Skilled in driving developer productivity, system resilience, and security by embedding best practices across teams. Adept at working directly with stakeholders to align technical solutions with business needs and at developing high-performing engineering teams. Microsoft-certified Azure Architect & Cybersecurity Expert.

Skills

Engineering Leadership & People Management Cross-functional team leadership, OKR-based performance management, performance reviews, mentoring, recruitment, culture building
Distributed Systems & Reliability SRE practices (SLOs/SLIs/SLAs, error budgets, toil elimination), incident management and blameless postmortems, on-call operations, capacity planning, performance optimization, troubleshooting large-scale distributed systems, fault-tolerant architecture, scalability, observability (metrics, logs, traces)
Cloud & DevOps Azure, AWS, GCP, Kubernetes, Docker, CI/CD (Jenkins, GitHub Actions, Azure DevOps), Observability (Prometheus, Grafana, ELK Stack, Azure Monitor), Infrastructure as Code
Data & AI AI/ML integration (LLMs, RAG, Model Context Protocol), Kafka, Spark, Elasticsearch, Vector Databases, SQL/NoSQL (PostgreSQL, MSSQL, MongoDB, Redis)
Security & Compliance ISO 27001/27701, GDPR, risk management, cloud security
Product & SaaS Delivery Enterprise SaaS platforms, solution architecture, customer engagement
Programming & Frameworks .NET Core, Java Spring, Angular, React, TypeScript
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Experience

From Jan. 2019 To Present

Communication & Information Technologies Experts S.A Athens, Greece

VP of Engineering

  • Define and execute the company's technical vision and engineering strategy, driving innovation across all product lines.
  • Lead and scale the engineering organization, implementing processes for delivery, quality, and reliability.
  • Worked on large-scale systems governed by SLOs, SLIs, and SLAs, maintaining reliability objectives such as a 4-hour MTTR.
  • Architected and delivered multiple SaaS platforms and large-scale distributed systems, including AI-enabled solutions, designed for multi-tenant performance, scalability, and security.
  • Develop internal developer productivity and quality platforms --- standardizing CI/CD pipelines (Jenkins, GitHub Actions, Azure DevOps), automating deployments, and creating reusable code libraries; integrate security and quality tooling (SonarQube, Trivy, SIG) to reduce release errors and accelerate delivery cycles.
  • Collaborate closely with product, design, sales, and marketing teams to align technology direction with business goals and customer needs.
  • Lead solution architecture and technical pre-sales, engaging directly with banking, law enforcement, and EU stakeholders to define requirements and secure contracts.
  • Conduct biannual performance reviews, recruitment, and promotion cycles, fostering growth and succession planning across teams.
  • Manage company participation and technical work packages in EU-funded projects (H2020, Horizon Europe), ensuring compliance and alignment with consortium objectives.
  • Ensure security and privacy compliance (ISO 27001:2022, ISO 27701:2019), embedding governance standards and quality policies across engineering workflows.
From Jan. 2017 To Dec. 2018

Communication & Information Technologies Experts S.A Athens, Greece

Senior Full Stack Software Engineer

  • Served as lead engineer on multiple public and private sector web application projects.
  • Owned technical design, architecture decisions, and requirements analysis.
  • Led containerization of legacy and new applications to improve scalability and maintainability.
From Jan. 2015 To Dec. 2016

Communication & Information Technologies Experts S.A Athens, Greece

Full Stack Software Engineer

  • Lead engineer on the Absence Management Subsystem of the Workloud platform --- a complex SaaS Workforce Management solution.
  • Designed databases and REST APIs to support scalable, modular backend architecture.
  • Developed both web and mobile frontends, ensuring responsive UX and consistent integration with backend services.

From 2012 To Dec. 2014

Communication & Information Technologies Experts S.A Athens, Greece

Lead Mobile Software Engineer

  • Designed and delivered 10+ enterprise mobile apps (Android/iOS) across full development lifecycle.
  • Built AOSP-based solutions integrating sensor data (RFID, fingerprint).

From 2012 To 2012

National and Kapodistrian University of Athens Athens, Greece

Mobile Software Engineer

  • Developed mobile applications for EU FP7 research projects.

Education