About ChallengeJP

Hi, My Name is Jacek – Welcome to My Website! Let Me Know How I Can Help You!

Book A Free Consultation

Fill in your details below and we’ll be in touch to arrange a no-obligation consultation

About ChallengeJP

Hi, My Name is Jacek – Welcome to My Website! Let Me Know How I Can Help You!

Book A Free Consultation

Fill in your details below and we’ll be in touch to arrange a no-obligation consultation

About ChallengeJP

Hi, My Name is Jacek – Welcome to My Website! Let Me Know How I Can Help You!

Book A Free Consultation

Fill in your details below and we’ll be in touch to arrange a no-obligation consultation

About Me

Hi, my name is Jacek and thank you for visiting my site. With over 10 years of experience working as Financial and Data Analyst for both corporate and startup companies, I am now happy to share my passion and knowledge of data and finance with other individuals and small business owners who need help with making sense of their numbers and articulating their business ideas.

Why I Started ChallengeJP

In short, I created ChallengeJP to help businesses grow and succeed, using data to fuel success.

Working with startups and small businesses is what I do best — my passion for data-driven success can help your business reach new heights. I can help you boost profitability, raise funds, and make the best decisions for your business, based on valuable data insights.

However, ChallengeJP isn’t just designed to help businesses. If you’re an individual wanting to develop your practical skills, I can help with all of your spreadsheet and data needs. With one-to-one Excel courses and tutorials and training in data analytics and financial modelling, I can help you take charge of your professional development.

Jacek Polewski
Westminster Bridge sunset

How My Passion for Data Began

In the early 90s, my cousin introduced me to a pioneering spreadsheet program called Lotus 1-2-3 and I was instantly fascinated by its potential. I spent hours playing around with its capabilities, writing simple formulas, connecting cells and manipulating formula outcomes by changing certain inputs.

I’ve always been the computer whizz in my family, but after Lotus 1-2-3 sparked my newfound love for spreadsheets, I was able to do more than help my Grandpa scan photographs. I took on my Mom’s accounting work and using digital spreadsheets, helped her assess and track her finances.

Fast forward several years, I arrived in London after studying in the sunny state of California, at the University of California, Berkeley. Although I had loved my studies, I quickly realised my degree wasn’t landing me any job opportunities. I realised I needed practical skills that could bring value to companies, and that’s when I decided to turn my love of spreadsheets into a profession. I brushed up my spreadsheet skills, became a Microsoft Excel pro and started a career as a Data Analyst.

My Career in Data: From Startups to Heathrow Airport to Yahoo!

One of my first jobs was at London Heathrow Airport, which as you can image, involved dealing with huge amounts of data. In this role, I took my knowledge of spreadsheets and data analysis to new levels, learning the advanced capabilities of Excel. This job was a fantastic, eye-opening experience, but I quickly realised I was craving a more exciting, dynamic work environment. So I opted to move on and begin work at a startup.

My official job title was “Business Analyst”, but in practice, I was the office “Excel guy”. Nevertheless, working with a startup company allowed me to work with creative entrepreneurs and take part in my first venture capital fundraise. I worked closely with the startup’s CFO, which eventually motivated me to develop my financial knowledge. And so I went on to pass the first level of the Chartered Financial Analyst (CFA) exam.

With more experience and relevant qualifications under my belt, I started to unlock more opportunities. When Yahoo! offered me a Senior Analyst position with relocation to Switzerland, I couldn’t say no. For a while, I loved working with this major, Fortune 500 company. However, the big corporate work environment just wasn’t for me — I missed the thrill of working with startups.

So when two of the founders of the startup I had worked with previously called to say they were working on a new venture in telecoms, I decided to join them. They were looking to raise over £100m, so my role involved taking the company public and creating complex financial models to capture the interest of investors. Working with another startup was a rollercoaster of challenges, but I loved every minute of it.

After the startup project, I decided to take another step forward and set up my own consultancy: ChallengeJP.

glasses & laptop

What Our Customers Say

One of the smartest people that I have worked with

Jacek is one of the smartest people that I have worked with. His ability to provide huge swathes of in-depth analysis are impressive to say the least and his brain is seemingly able to compute huge amounts of data whilst his Excel skills are second to none. He is also a really great guy and I am confident that he would be an invaluable asset to any company.

James Kaye, Director and Co-Founder at Big Ideas Machine

ChallengeJP Excel and Data Consulting Services
5
2020-04-08T12:29:41+02:00

James Kaye, Director and Co-Founder at Big Ideas Machine

Jacek is one of the smartest people that I have worked with. His ability to provide huge swathes of in-depth analysis are impressive to say the least and his brain is seemingly able to compute huge amounts of data whilst his Excel skills are second to none. He is also a really great guy and I am confident that he would be an invaluable asset to any company.

Highly skilled in financial modelling and complex business case development

Jacek is a real top performer and highly skilled in financial modelling and complex business case development. I worked with him on a number of high value transactions and his expertise was invaluable to deal structuring and closing. Highly Recommended!

Andy Nash, Head of Public Sector and New Cities at CityFibre

ChallengeJP Excel and Data Consulting Services
5
2020-04-10T11:20:52+02:00

Andy Nash, Head of Public Sector and New Cities at CityFibre

Jacek is a real top performer and highly skilled in financial modelling and complex business case development. I worked with him on a number of high value transactions and his expertise was invaluable to deal structuring and closing. Highly Recommended!

A very competent and detailed financial analyst

I have worked closely with Jacek during intensive periods of financing, needed to fund the growth of CityFibre PLC. Jacek's work was pivotal to the success of these initiatives. He is a very competent and detailed financial analyst and his work is not only reliable but creative. Extremely hardworking and intelligent guy. I enjoyed working with him.

Peter Manning, Chairman of CityFibre Holdings PLC

ChallengeJP Excel and Data Consulting Services
5
2020-04-08T12:24:20+02:00

Peter Manning, Chairman of CityFibre Holdings PLC

I have worked closely with Jacek during intensive periods of financing, needed to fund the growth of CityFibre PLC. Jacek's work was pivotal to the success of these initiatives. He is a very competent and detailed financial analyst and his work is not only reliable but creative. Extremely hardworking and intelligent guy. I enjoyed working with him.
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ChallengeJP Excel and Data Consulting Services

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