Meet TANDEM Your Dedicated Payment Advisor
Bringing clarity to complex payments decisions. Delivering impact where it matters most.
Story Behind
TANDEM was founded on extensive experience across payments and banking sectors, built through years of working with financial institutions. Prior to establishing the firm, I held senior roles at Mastercard and Global Payments Europe, partnering with banks and fintechs on strategy, growth, and transformation initiatives across markets.
Through experience, we saw a clear need independent, senior-level expertise to support critical decisions in an increasingly complex payment landscape. TANDEM was created to provide focused, high impact advisory grounded in real world execution.
Today, I work with banks and fintechs to bring clarity to complex challenges and deliver measurable business outcomes.
Want to Know What's Possible?
A Partnership Built on Trust
and Long-Term Vision
I believe in transparency, accountability, and empowering you with the knowledge to make confident business decisions. My approach centres on understanding your unique situation first, then building strategies that truly align with your life goals.
Core Values
[01]
Deep Collaboration
We work side by side with you, fostering open communication and shared accountability to ensure strategies translate into real, lasting impact.
[02]
Expertise
With over two decades of experience in payment services, I bring deep market knowledge and strategic insight to every client relationship.
[03]
Tailored Solutions
No two clients are alike. Every strategy is built around your unique goals, priorities, and your specific circumstances.
Professional Experience
2026 - Present
2023 – 2026
2011 – 2023
2007 – 2011
2002 – 2007
Independent Advisor (TANDEM)
Founded TANDEM Consulting.
Solutions Architect (Mastercard)
Designed and integrated payment solutions to ensure secure, scalable, and seamless transactions across platforms.
Account Director (Mastercard)
Developed and managed business relationship with key issuers and acquirers.
Head of Presales (Global Payments Europe, Adriatic region)
Created and conducted proposal presentations and RfP responses.
Senior Card Operations Specialist (NLB Bank Sarajevo)
Responsible for compliance with scheme rules.
Professional Experienc
2016 – Present
Independent Financial Advisor
Founded Grant Financial Advisory, helping individuals and families achieve their financial goals through personalised guidance.
2013 – 2016
Financial Analyst, London
Developed analytical expertise at a leading City firm, specializing in portfolio management and risk assessment.
2010 – 2013
Wealth Management Associate
Built foundation in client services and wealth planning at a prestigious private bank.
Proven What Our
Clients Say
"
Oliver provided clarity where we had confusion, and structure where we had chaos. It's been one of the best investments we've made as a family.
James Harrison
Business Owner
"
From the first meeting, Oliver was invested in our success. His structured process and sharp strategy helped us turn our finances around completely.
James Harrison
Business Owner
"
Oliver provided clarity where we had confusion, and structure where we had chaos. It's been one of the best investments we've made as a family.
James Harrison
Business Owner
[CTA]
Team up with a Payments Expert to Accelerate Growth and Deliver measurable Results
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✓ Discover Tailored Solutions
© 2026 TANDEM Consulting doo. All rights reserved.
Let's transform your financial vision into results.