MYOB Data Consulting

Unlock Your Data Potential

Gain insights that drive results with a comprehensive data strategy designed for your business

Core Expertise

15+ years of industry experience distilled into four strategic pillars. 
We bridge the gap between complex infrastructure and business logic through customized data solutions that scale with your ambitions.
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Fractional Head of Data

Secure executive-level strategy without the full-time overhead.

Provide the senior leadership required to drive innovation while navigating budget and resource constraints.

Strategic Guidance: Hands-on expertise at the board and C-suite level.
Organizational Design: Defining roles and architecting your internal data function.
Talent Strategy: Technical vetting and interviewing for senior data hires.
Executive Advisory: Ongoing mentorship for existing teams and technical roadmap development.

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Infrastructure & GTM Engineering

Build a scalable foundation for accurate, real-time data flow.

Bridge the gap between technical complexity and commercial execution by architecting modern, high-performance data stacks.

Cloud Engineering: Seamless migrations and architecture across AWS, GCP, and Azure.
GTM Engineering: Precise event tracking and GTM implementation.
Product Analytics: Technical setup for Mixpanel, Amplitude, and Heap.
Marketing Data Operations: Technical preparation and structuring of cross-channel data for social and growth strategy,

Reporting & Insights

Transform raw data into a reliable engine for growth.

Empower organizations to move beyond "tracking" to a state of actionable, data-driven maturity.

Financial Integrity: Reliable Billing, MRR, and SaaS Metric Reporting.
Growth Analytics: Full-Funnel Attribution & Reporting and Product Usage Segmentation.
Predictive Logic: Customer Health Scoring and proactive Churn mitigation.
Technical Advisory: High-impact custom projects and specialized data troubleshooting.

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Governance & Exit Readiness

Achieve the highest level of data integrity for critical milestones.

Implement the rigorous standards required to survive the scrutiny of an IPO, M&A, or professional audit.

IPO-Grade Governance: Building "audit-ready" data frameworks from the ground up.
Investor Relations: Preparation of Investor Packs and high-level Board reporting.
Data Room Management: Structuring and cleaning data for M&A due diligence.
Compliance & Audit Support: Ensuring long-term data integrity and regulatory alignment.

Case Study: Predictive Lead Scoring & Logic

Transforming product usage data into prioritized sales intelligence.

Originally presented as a public technical walkthrough, this framework outlines the end-to-end architecture for a high-growth SaaS lead scoring system. It demonstrates the transition from raw event tracking to a weighted, actionable scoring model designed to optimize sales efficiency.

View Technical Brief (PDF)

About MYOB Data

In an era where data is a company’s most vital asset, MYOB Data Consulting provides the strategic oversight necessary to turn fragmented information into a unified engine for growth. Based in Greece and serving a global clientele, we specialize in bridging the gap between complex technical infrastructures and high-level business objectives.

Our firm is built on the principle that data should be a source of clarity, not a source of friction. We focus on high-stakes environments where accuracy and regulatory compliance are non-negotiable.

At MYOB Data, we don’t just offer advice; we design the frameworks that allow organizations to scale with confidence and make informed, data-driven decisions at every level of maturity.

Lefteris Mantelas, PhD

Founder & Lead Consultant

I founded MYOB Data to help leaders solve complex problems and turn data into a primary engine for growth. With over 15 years of experience, I’ve improved business performance and enabled intelligent decision-making for global giants like Google, Coca-Cola, P&G, Hess, and E.ON.

My career has been defined by a rare mix of high-level strategy and hands-on tactical execution. I’ve navigated the unique data landscapes of industries ranging from SaaS and Banking to Energy and Shipping, adapting to various technological maturity stages and infrastructures along the way.

Beyond the data itself, I am a builder of teams and a leader of people. From managing R&D projects to coaching remote, cross-timezone teams, I’m driven by a simple mission: to act as an agent of growth and a tireless advocate for a data-smart culture within every organization I serve.

Client Success & Validation

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"Over nearly two years, MYOB Data has been a critical partner in scaling our internal reporting capabilities. The firm built a comprehensive reporting layer that allowed us to move from fragmented data to a unified view of our business performance, directly supporting key strategy revisions."

Perttu Ojansuu, CEO at Happeo

"Lefteris brings a level of technical rigor and strategic clarity that is rare in the analytics space. His work is precise, reliable, and provides the exact insights we need to optimize performance at scale."

John Short, Founder, Compound Growth Marketing

"On more than a few occasions, MYOB Data assisted us in bridging the gap between abstract concepts and concrete project execution. Their ability to refine initial ideas into actionable steps, supported by rigorous analysis, provided the clarity we needed for effective decision-making."

Eleftheria Zourou, Founder and CEO of Doctoranytime

"MYOB Data was instrumental in auditing and refining our financial reporting layer. They helped us establish a robust 'single source of truth' for our MRR and key SaaS metrics, providing the level of data integrity required for high-level fiscal planning and investor-grade reporting."

Ilias Xanthopoulos, CFO at Yodeck

"MYOB Data provided the technical framework we needed to understand product usage and customer health at a granular level. The dashboards and scoring systems developed by the firm have been instrumental in how we track adoption and identify proactive opportunities for customer success."

Adam Pinkham, Product at Happeo

"Despite technical and organizational headwinds, MYOB Data provided a grounded, objective assessment of our environment. Their ability to identify core blockers was essential for our internal understanding of what was required to reach the next stage of maturity. Overall, excellent professionalism with deep knowledge in the field"

Stefanos Katsantonis, Analytics/BI Lead at Epignosis learning technologies

"Lefteris and the MYOB Data team helped us build better visibility into our acquisition funnel. They worked with us to understand our specific metrics and set up tracking that gave us more clarity on our growth initiatives."

Andrew Pringle, SVP Revenue at Yodeck

"Working closely with Lefteris, we architected our entire reporting layer - from MRR tracking to complex funnel analytics - providing the reliable, historic, and real-time data needed."

- Kyrylo Yehortsev, Growth at happeo

"MYOB Data provided critical strategic input during the inception of several ad-hoc data projects. The firm’s ability to help define the technical framework and ensure project viability from the start has made them a reliable partner for our more complex data initiatives."

Vangelis Christou, CTO at Doctoranytime

“Lefteris played a key role during a critical phase of our organizational growth. He didn’t just assist in a hire; he architected the BI Manager role, designed a rigorous technical vetting process, and led the interview stages. His involvement ensured we maintained a high standard for both technical excellence and leadership fit.”

Eleni Kourmentza, Chief People Officer at LearnWorlds

"We faced the challenge of huge amounts of data, but it was difficult to make complete sense. We turned to MYOB to give a concise and trusted view of critical data points across our customer journey. MYOB took a complex situation and successfully introduced unified insight, supporting our planning and delivering a higher level of revenue predictability."

James Robins, CMO at Yodeck

"At Linq, Lefteris brings a much-needed balance of academic rigor and hands-on experience to our BI and Analytics programs. His ability to translate complex data structures into clear, standardized frameworks has made him a vital contributor to how we prepare professionals for the technical and strategic demands of modern data roles."

Yannis Imelos, Co-Founder & CEO at linq

"Over nearly two years, MYOB Data has been a critical partner in scaling our internal reporting capabilities. The firm built a comprehensive reporting layer that allowed us to move from fragmented data to a unified view of our business performance, directly supporting key strategy revisions."

Perttu Ojansuu, CEO at Happeo

"Lefteris brings a level of technical rigor and strategic clarity that is rare in the analytics space. His work is precise, reliable, and provides the exact insights we need to optimize performance at scale."

John Short, Founder, Compound Growth Marketing

"On more than a few occasions, MYOB Data assisted us in bridging the gap between abstract concepts and concrete project execution. Their ability to refine initial ideas into actionable steps, supported by rigorous analysis, provided the clarity we needed for effective decision-making."

Eleftheria Zourou, Founder and CEO of Doctoranytime

"MYOB Data was instrumental in auditing and refining our financial reporting layer. They helped us establish a robust 'single source of truth' for our MRR and key SaaS metrics, providing the level of data integrity required for high-level fiscal planning and investor-grade reporting."

Ilias Xanthopoulos, CFO at Yodeck

"MYOB Data provided the technical framework we needed to understand product usage and customer health at a granular level. The dashboards and scoring systems developed by the firm have been instrumental in how we track adoption and identify proactive opportunities for customer success."

Adam Pinkham, Product at Happeo

"Despite technical and organizational headwinds, MYOB Data provided a grounded, objective assessment of our environment. Their ability to identify core blockers was essential for our internal understanding of what was required to reach the next stage of maturity. Overall, excellent professionalism with deep knowledge in the field"

Stefanos Katsantonis, Analytics/BI Lead at Epignosis learning technologies

"Lefteris and the MYOB Data team helped us build better visibility into our acquisition funnel. They worked with us to understand our specific metrics and set up tracking that gave us more clarity on our growth initiatives."

Andrew Pringle, SVP Revenue at Yodeck

"Working closely with Lefteris, we architected our entire reporting layer - from MRR tracking to complex funnel analytics - providing the reliable, historic, and real-time data needed."

- Kyrylo Yehortsev, Growth at happeo

"MYOB Data provided critical strategic input during the inception of several ad-hoc data projects. The firm’s ability to help define the technical framework and ensure project viability from the start has made them a reliable partner for our more complex data initiatives."

Vangelis Christou, CTO at Doctoranytime

“Lefteris played a key role during a critical phase of our organizational growth. He didn’t just assist in a hire; he architected the BI Manager role, designed a rigorous technical vetting process, and led the interview stages. His involvement ensured we maintained a high standard for both technical excellence and leadership fit.”

Eleni Kourmentza, Chief People Officer at LearnWorlds

"We faced the challenge of huge amounts of data, but it was difficult to make complete sense. We turned to MYOB to give a concise and trusted view of critical data points across our customer journey. MYOB took a complex situation and successfully introduced unified insight, supporting our planning and delivering a higher level of revenue predictability."

James Robins, CMO at Yodeck

"At Linq, Lefteris brings a much-needed balance of academic rigor and hands-on experience to our BI and Analytics programs. His ability to translate complex data structures into clear, standardized frameworks has made him a vital contributor to how we prepare professionals for the technical and strategic demands of modern data roles."

Yannis Imelos, Co-Founder & CEO at linq

"Over nearly two years, MYOB Data has been a critical partner in scaling our internal reporting capabilities. The firm built a comprehensive reporting layer that allowed us to move from fragmented data to a unified view of our business performance, directly supporting key strategy revisions."

Perttu Ojansuu, CEO at Happeo

"Lefteris brings a level of technical rigor and strategic clarity that is rare in the analytics space. His work is precise, reliable, and provides the exact insights we need to optimize performance at scale."

John Short, Founder, Compound Growth Marketing

"On more than a few occasions, MYOB Data assisted us in bridging the gap between abstract concepts and concrete project execution. Their ability to refine initial ideas into actionable steps, supported by rigorous analysis, provided the clarity we needed for effective decision-making."

Eleftheria Zourou, Founder and CEO of Doctoranytime

"MYOB Data was instrumental in auditing and refining our financial reporting layer. They helped us establish a robust 'single source of truth' for our MRR and key SaaS metrics, providing the level of data integrity required for high-level fiscal planning and investor-grade reporting."

Ilias Xanthopoulos, CFO at Yodeck

"MYOB Data provided the technical framework we needed to understand product usage and customer health at a granular level. The dashboards and scoring systems developed by the firm have been instrumental in how we track adoption and identify proactive opportunities for customer success."

Adam Pinkham, Product at Happeo

"Despite technical and organizational headwinds, MYOB Data provided a grounded, objective assessment of our environment. Their ability to identify core blockers was essential for our internal understanding of what was required to reach the next stage of maturity. Overall, excellent professionalism with deep knowledge in the field"

Stefanos Katsantonis, Analytics/BI Lead at Epignosis learning technologies

"Lefteris and the MYOB Data team helped us build better visibility into our acquisition funnel. They worked with us to understand our specific metrics and set up tracking that gave us more clarity on our growth initiatives."

Andrew Pringle, SVP Revenue at Yodeck

"Working closely with Lefteris, we architected our entire reporting layer - from MRR tracking to complex funnel analytics - providing the reliable, historic, and real-time data needed."

- Kyrylo Yehortsev, Growth at happeo

"MYOB Data provided critical strategic input during the inception of several ad-hoc data projects. The firm’s ability to help define the technical framework and ensure project viability from the start has made them a reliable partner for our more complex data initiatives."

Vangelis Christou, CTO at Doctoranytime

“Lefteris played a key role during a critical phase of our organizational growth. He didn’t just assist in a hire; he architected the BI Manager role, designed a rigorous technical vetting process, and led the interview stages. His involvement ensured we maintained a high standard for both technical excellence and leadership fit.”

Eleni Kourmentza, Chief People Officer at LearnWorlds

"We faced the challenge of huge amounts of data, but it was difficult to make complete sense. We turned to MYOB to give a concise and trusted view of critical data points across our customer journey. MYOB took a complex situation and successfully introduced unified insight, supporting our planning and delivering a higher level of revenue predictability."

James Robins, CMO at Yodeck

"At Linq, Lefteris brings a much-needed balance of academic rigor and hands-on experience to our BI and Analytics programs. His ability to translate complex data structures into clear, standardized frameworks has made him a vital contributor to how we prepare professionals for the technical and strategic demands of modern data roles."

Yannis Imelos, Co-Founder & CEO at linq

Key FAQs

1. What specific types of problems does MYOB Data solve?

We bridge the gap between fragmented data infrastructures and high-level business objectives. Whether it is architecting a "source of truth" for MRR and funnel analytics, designing data governance frameworks, or preparing a company’s data for the scrutiny of an IPO or M&A, we ensure your data is accurate, compliant, and actionable.

2. At what stage of maturity should a company engage your services?

Most of our clients are high-growth SaaS companies or established enterprises navigating a transition—such as scaling their operations, preparing for a major financial milestone, or needing to move beyond basic reporting to advanced predictive analytics and customer health scoring.

3. Do you replace our existing data or engineering team?

No. We act as a strategic partner to your existing team. We provide the senior-level oversight and specialized expertise (such as Data Governance or Organizational Design) that in-house teams often lack the time or specific experience to implement while maintaining daily operations.

4. Can MYOB Data help us build our internal data function?

Yes. Beyond technical architecture, we provide "Fractional Data Leadership." This includes defining team structures, designing job descriptions for senior roles, and leading technical assessments to ensure you hire the right talent for your long-term needs.

5. Is your approach tool-agnostic?

Yes. While we have deep experience with the industry-standard modern data stack, our focus is on the underlying logic, data integrity, and business value. We adapt to your existing infrastructure or help you select the tools that best fit your specific scaling requirements.

6. Is "IPO Readiness" only for companies planning to go public?

Not exclusively. We use the term "IPO-grade data" as a benchmark for excellence. It means your data is so well-governed, clean, and auditable that it could withstand the highest level of professional scrutiny. Every growth-oriented company benefits from this level of rigor, regardless of their exit strategy.

Let’s Discuss Your Data Strategy

Don’t see your specific challenge listed? We handle bespoke data architecture and specialized advisory projects for scaling companies.

Send us a message and we'll get back to you as soon as we can. Or email us directly at [email protected].

Community Leadership

MYOB Data is a proud sponsor of the Business Intelligence & Analytics Athens community. We host regular meetups focused on modern data stacks, strategy, and technical excellence in the Greek data ecosystem.

Join the community on LinkedIn