Dimitrios Vorisis, Project Manager in Málaga, Spain
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Dimitrios Vorisis

Verified Expert  in Project Management

Project Manager

Málaga, Spain
Toptal Member Since
September 3, 2019

Dimitrios has a solid foundation in software development, having been an active member as a software developer, engineering manager, and test manager in the different projects he has led. Dimitrios has a solid foundation in managing projects in both planned environments, where requirements are generally known, and unplanned ones, where a discovery-driven approach coupled with agile execution is mandatory.

Project Highlights

Led the discovery, design, and implementation of a new service in the platform, under very strict timelines.
Delivered the company's first SaaS with a team of 150 engineers in 5 locations in the world through scaled Agile principles.
IBM OEM V1 - Enriching Sametime with VoIP and Conferencing
Working with Unify, the first OEM partnership with IBM, in product delivery that was 11 months late to its commercialization.


Work Experience

Senior Agile Delivery Manager

2016 - 2019
  • Supervised development teams and created delivery schedules.
  • Conducted the agile transformation of the teams and onboarded technical standards of system quality such as ISO/IEC 9126.
  • Conducted project discovery and system design with engineering and product.
  • Built the cybersecurity capability of the organization (drafting policies, optimizing processes and procedures) in accordance with ISO 27001.
  • Introduced risk management (through FMEA) and trade-off analysis (through ISO/IEC-9126).

Senior Manager, IT, Project Management

2015 - 2016
Sixt Leasing
  • Drafted and put in effect the first agile fixed-price contract for a new mobility platform.
  • Drafted and put in effect IT operations contracts for multiple in-house and outsourced entities for a new mobility service, Global Reporting.
  • Managed the software construction and integration of the mobility services portal with Siemens' mobility department.
  • Conducted vendor management for the new mobility center B2B service.
  • Designed and executed vendor selection (from RFP authoring to vendor selection).

Senior Manager, New Product Development, Program Management

2008 - 2015
Unify (formerly Siemens Enterprise Communications)
  • Worked as head of PMO for the R7D of new product development, managed the realization of products (between $4 million and $15 million), typically managing resource allocation, risk of time to market, and intellectual property.
  • Managed the technical aspects of the OEM partnership with IBM and the activities to export the product from the US (export control).
  • Increased efficiency of the company-wide vulnerability management process.
  • Worked as head of PMO of the first SaaS product (Circuit) that Unify brought to market, competing with Slack and Cisco. Project managed a team of 120 engineers (software developers, test engineers, system engineers).

Engineering Manager

2007 - 2008
Siemens IT Solutions & Services
  • Coached and mentored a team of five developers and worked with the team to conduct system design of features, code reviews, and review of quality system attributes.
  • Designed the software architecture of the internationalization strategy of a portal in .NET.
  • Managed the project team delivering training to ECDC and delivered professional training.

Senior Engineer (Network Management and Subscriber Management Products)

2004 - 2007
Nokia Siemens Netwroks
  • Released management of the network and subscriber management products for the ITU/ETSI variants.
  • Coached and mentored a team of three engineers who worked together to conduct system design and effort estimation. Supported development as needed, the definition of development tests, and conducted code reviews.
  • Liaised with the global vendor support for problems found by customers.
  • Extended the architecture of the network management product to deliver new project needs.


Led the discovery, design, and implementation of a new service in the platform, under very strict timelines.

#PriceItUp is Betvictor's product that allows customers to build their bets according to their wishes. The product offers an extensive selection and, through the diversity of options, delivers highly pleasurable experiences in online gambling.

Cybersecurity in Betvictor

Led a team of directors through the activities to increase Betvictor's cybersecurity stance.

Cybersecurity is the internal project in Betvictor, aiming to increase the maturity in cybersecurity of the group of companies. Working directly with the group's CTO, under my leadership, I worked with directors and security experts to discover, scope, implement, or acquire technologies and design the new capabilities of the organization (policies, processes, procedures) to deliver on the mandate. The activities included changing well-established procedures, building new capabilities for monitoring, cross-training and hiring personnel, and identifying, acquiring, and integrating new technologies in the environment.

Enhancing the Virtual Sports Offering

Led the digital implementation of revamping the virtual offerings product with a new development site in Portugal.

The company's virtual sports offering required revamping after years of operation. Working with the development outsourcing site in Portugal, we delivered a newly revamped product, following modern architectural paradigms that addressed the maintainability issues that proliferated over years of patching solutions and offered a more encapsulated solution design.


Delivered the company's first SaaS with a team of 150 engineers in 5 locations in the world through scaled Agile principles.

Unify (formerly Siemens Enterprise Communications) sought to enter the SaaS business as a strategic decision to integrate and move closer to the end-user vertically. Circuit was the first product in the portfolio to enable the company to enter the new business domain with a $15 million investment and partner with Frog.

The complexity of the endeavor was not only on the service design side but on the engineering as well, given that new technologies that were part of the business scope, the project management transformation towards agile project management on top of the standard activities (e.g., export control from multiple countries, intellectual property classification, patent auditing, legal auditing, etc.).

B2B Mobility Portal

Working under extremely tight deadlines, delivered the first digital B2B integration between Sixt Leasing and Siemens.

The major challenges were along three dimensions:
1. Sixt Leasing had never entirely performed a complete business process integration with one of its customers to the degree that Siemens required
2. Setting up a new outsourcing partnership with two vendors, moving away from the traditional fixed-price contracts by creating the first agile fixed-price contract in Sixt Leasing.
3. The scope of change for Sixt Leasing was diverse and deep because part of this partnership with Siemens meant that Sixt Leasing was moving away from the traditional business model of offering managed services towards a business model of customer self-service.

The delivery was happening under stringent deadlines to facilitate the customer's organizational restructuring journey (as they removed the automotive mobility function from their organization).

IBM OEM V1 - Enriching Sametime with VoIP and Conferencing


Working with Unify, the first OEM partnership with IBM, in product delivery that was 11 months late to its commercialization.

The IBM OEM project was the strategic initiative of IBM partnering with Unify as an OEM to enhance the Sametime suite with VoIP capabilities and compete against Microsoft and Skype for business.

It was already two months late when I joined the IBM OEM project. Working diligently with IBM and stakeholders inside Unify, we moved to an agile delivery cycle, integrating further with the four labs that IBM operated worldwide and providing direct R&D-to-R&D support in realizing the product.

After nine months of roughly 20 deliveries and almost 700 issues identified during the product integration activities, procurement activities that required exporting Unify's software from US instead of Germany, coordinating with the two companies' legal departments to ensure compliance to open source licenses and intellectual property laws, IBM Sametime's organization made General Availability in July 2009 and reached competitive parity with Microsoft.

ECDC Training Professional Services


Coached junior trainers to provide training to the ECDC on the and how member countries would achieve data integration.

Providing professional training to ECDC was Siemens Greece's first step to moving closer to the business areas that Siemens IT Solutions and Services provided.

As part of the overall activity, a team of eight trainers was tasked to provide professional training to ECDC in the organization's first attempt to achieve digital data integration with the member states.

The professional training held a substantial symbolic role due to the number of decision authority personnel participating in the activity, and the challenge lay in achieving the educational needs of ECDC and solidifying its role as the leading authority of data ownership of disease control and prevention in Europe.

The trainers' team made a remarkable achievement, surpassing the quality expectations of ECDC and impressing the member states' representatives with the outcome's quality, which solidified ECDC's training program with Siemens Greece as their partner of choice.
2000 - 2001

Master's Degree in Distributed Systems and Networks

University of Kent - Kent, United Kingdom

1995 - 2000

Bachelor's Degree in Computer Science

University of Piraeus - Piraeus, Greece


Six Sigma Black Belt

University System of Georgia


Strategic Leadership and Management

University of Illinois at Urbana-Champaign


Organizational Analysis

Coursera - Stanford


Jira, Confluence, IBM Rational ClearQuest, IBM Rational ClearCase

Industry Expertise

Gambling, Telecommunications, Automotive, Technology, Professional Services


Scrum, Waterfall Delivery, Waterfall Development, Agile, Agile Project Management, Kanban, Six Sigma, Management, Real-time Systems, Organizational Analysis


Project Discovery, Project Delivery, Distributed Team Management, Waterfall Methodology, Program Design, Lean Portfolio Management, System Design, Project Planning, Sprints, Web Project Management, Feature Backlog Prioritization, Software as a Service (SaaS), Scaled Agile Framework (SAFe), Service Design, Organizational Leadership, Request for Proposal (RFP), Distributed Software, Visual Basic .NET (VB.NET), C#, Java, ISO 27001, ISO/IEC 9126, Net Promoter Score (NPS), Technical Program Management, Technical Project Management, Customer Experience, Software Development Lifecycle (SDLC), Software Development, New Product Development, Computer Science, Delivery Management, Project Management, ICT Training, OEM Account Management, Reverse Engineering, RFPs, RFQs, ITTs, Responses, Proposals & Quotes, Contract Drafting, Technology Solutions, SaaS, Agile Transformation, Platforms, Jira REST API, Excel VBA, Engineering, Product Design, Product Delivery, Agile Product Delivery, Organizational Design, Decision Analysis

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