Data analyst portfolio project
Data analyst portfolio project is a free, beginner online course from Herizon.
Build one end-to-end analysis on open Finnish data: a question, a clean dataset, SQL or a spreadsheet, three honest charts and a one-page memo. Then publish it, put it on your CV and talk it through in an interview.
You finish with Exploratory Data Analysis and Data Storytelling added to your Herizon profile.
Free · 37 min read · certificate when you pass the quiz · part of Data analyst · last updated 30 October 2026
Free account, about two minutes. You can join if you live in the EU, EEA, UK or Switzerland, or a partner organisation invited you.
Already have an account? Open it in the portalA look inside the course
Daniela lives in Espoo. She worked in retail operations before she moved to Finland, and she has finished the SQL and data analytics courses. Now she reads an ad from Polkuri, a made-up Helsinki company with a bike-commuting app. The ad asks for SQL or spreadsheets, clear communication and a link to a portfolio. She has the skills. She has nothing to link to.
It takes about 37 min of reading, plus exercises, a short quiz and a practice task. It teaches Exploratory Data Analysis and Data Storytelling. Pass the short quiz at the end to get a certificate.
What you will be able to do
- How to choose a question that open data can answer
- How to find open data, check its licence and credit the source
- How to read, clean and join two files, and log every fix
- How to compare fairly and say what your numbers cannot show
- How to draw three honest charts and write a one-page memo
- How to publish your work, put it on your CV and LinkedIn, and talk it through in an interview
The situation you work through
Daniela, a job seeker in Espoo, wants a junior analyst role at Polkuri, a made-up Helsinki bike-commuting app company. With two invented practice files (29 counter rows, 28 weather rows) she asks how much rain cuts weekday riders, cleans and joins the files, finds 2,615 riders on rainy weekdays against 3,472 on dry ones, makes three honest charts and a one-page memo, publishes it on GitHub and walks Polkuri's interviewer through it.
Your practice task
Build one portfolio project on open data, Finnish or other, that you are allowed to share. Write one question tied to a job you want and fix your definitions first. Keep the raw files, clean a copy and log at least three fixes. Answer the question in a spreadsheet or in SQL with a fair comparison, and say how many rows each number rests on. Make three charts with titles that state the finding and a source line, write a one-page memo with the answer, three findings and one limit, and publish it as a public GitHub README or a view-only Google Sheet with every source and licence credited. Add a CV line and a two-minute STAR walk-through. Submit the public link and a short summary, with no personal data inside.
Key topics
- What a portfolio project proves
- Pick a question
- Find open Finnish data
- Read the files before you clean
- Clean a copy and log it
- Join the two files
and 8 more pages
What you get when you pass
A certificate with your name, the course and the date. Sharing it is your choice. If you share it, it has a public link that anyone can open to check it, and you can add it to LinkedIn.
Common questions about Data analyst portfolio project
- Is Data analyst portfolio project free?
- Yes. The course is free with a Herizon account, and the account is free too.
- How long does Data analyst portfolio project take?
- It takes about 37 min of reading, plus exercises, a short quiz and a practice task. You can stop and continue later, because the portal keeps your place.
- Do I get a certificate?
- Yes. Pass the short quiz at the end to get a certificate you can share, for example on LinkedIn.
- What do I need to start?
- A free Herizon account. The course is written at beginner level.
- Who can join Herizon?
- You can join if you live in the EU, EEA, UK or Switzerland, or a partner organisation invited you.
Start Data analyst portfolio project free
Start this course freeCommon questions about Data analyst portfolio project
- Is Data analyst portfolio project free?
- Yes. The course is free with a Herizon account, and the account is free too.
- How long does Data analyst portfolio project take?
- It takes about 37 min of reading, plus exercises, a short quiz and a practice task. You can stop and continue later, because the portal keeps your place.
- Do I get a certificate?
- Yes. Pass the short quiz at the end to get a certificate you can share, for example on LinkedIn.
- What do I need to start?
- A free Herizon account. The course is written at beginner level.
- Who can join Herizon?
- You can join if you live in the EU, EEA, UK or Switzerland, or a partner organisation invited you.
More in Data analyst
- Data analytics fundamentals41 min · 11 pages
- Excel for office and data jobs30 min · 12 pages
- SQL & data analysis49 min · 10 pages
- Python for beginners53 min · 11 pages
- Desk research that actually informs decisions28 min · 11 pages
- Machine learning fundamentals36 min · 11 pages
- Power BI basics for data roles27 min · 12 pages
- Data science fundamentals29 min · 10 pages
- Data engineering fundamentals26 min · 10 pages