Tech
Jerry Uusitalo
Jan 15, 2026
My Internship Journey at Wolt: Jerry, Fraud Prevention Team
When you picture a software engineer fighting fraud at scale, you might not imagine someone who spent years doing music. But that’s exactly where my story starts.
Hi, I’m Jerry, and this is how I went from Wolt Support Associate to Software Engineering Intern, and finally to Software Engineer on Wolt’s Fraud Prevention team. If you’re thinking about applying for an engineering internship at Wolt, I hope my experience helps you feel a little more confident and a little more excited about your own journey.
From Music to Coding: How It All Started
Before becoming an engineer, I worked as a music teacher and performer. When my first child was born, I realized that unpredictable hours weren’t ideal for family life. Having always been fascinated by the internet, computers, and software, programming felt like a natural next step.
A free Java course from the University of Helsinki got me instantly hooked and I knew that building software was what I wanted to do long-term. Soon after, I enrolled in Business College Helsinki’s Full Stack Developer program.
I had previously worked at Wolt as a Support Associate from 2020 to 2022, and even after leaving, I hoped it wouldn’t be a goodbye. Wolt had proven to be a working environment that brought together great people who were all working towards a shared goal. So when the engineering internship opened, I knew it was the chance I had been waiting for.
“As a software engineer, Wolt felt like the perfect environment to get my hands dirty with real challenges — and to kickstart my new career.”
Joining Wolt Engineering
In spring 2025, I joined the Fraud Prevention team as a Software Engineering Intern. Our team focuses on keeping our users safe by preventing fraud on the platform.
We’re a fully distributed team, collaborating across Europe, so almost all of our work happens remotely. That means clear communication, strong documentation, and teamwork really matter.
A typical day for me includes:
reviewing pull requests
communicating with different stakeholders
and of course — coding
Team members are given a lot of freedom and responsibility when it comes to planning, implementing, and documenting new features or integrations. Everyone is supportive and quick to help each other out whenever someone gets blocked.
For the most part of my internship, I focused on a project that manages internal fraud engine rules through a user interface. This project enables our team’s non-technical members to manage rules independently, saving time and allowing updates to go live within a minute — instead of waiting for the usual deployment process for new features.
“It was rewarding to see how something I built made a real difference for the team’s day-to-day work.”
Life on the Fraud Prevention Team
Working at Wolt has been exciting, international, challenging, and fun. It feels like the actions you take have an impact, especially in the Fraud Prevention team. The domain itself is constantly evolving as fraudsters find new tactics, which keeps things challenging and dynamic.
The team welcomed me warmly — not as “just an intern,” but as a full member of the team. My mentor, Oleg, was incredible. Shout-out to him especially for patiently answering questions and guiding me throughout my internship.
“Even as an intern, you can make a meaningful change when you’re surrounded by people who believe in you and want to see you succeed.”
And it wasn’t just my immediate team. Engineers from other teams were also willing to jump in whenever I needed help.
Lessons from working at scale
I knew that Wolt was a big company, but what surprised me most was the sheer scale of everything. And by everything, I mean the number of tools, repositories, documentation pages, platforms, infrastructure components, the volume of orders, and the incredible speed at which the company is evolving. It takes time to get used to everything happening around you and to keep up with the constant change.
The most valuable lesson I’ve learned is that being a software engineer goes far beyond writing code. It’s about understanding how different services fit together, how design decisions ripple across systems, and how collaboration keeps everything moving at scale.
One highlight of my internship was Product+ Week in Tallinn where I finally met my teammates and many other Woltians in person. That experience really changed how I saw myself as part of the team and made me feel more connected to Wolt.
The next thing on my radar is to keep growing as a professional, both in my team’s domain of fighting fraud and as a software engineer. There are so many exciting things happening at Wolt right now, and even more on the horizon.
People often think Wolt is “just a food delivery company,” but internally, you quickly discover the depth and diversity of work behind the scenes. I’ve also heard Woltians described as “high performance, low ego,” and I couldn’t agree more. People here take real ownership and pride of their work and care deeply about what they do. It’s been an incredibly inspiring place to be. I’m genuinely happy where I am, both in my team and in my domain. I wouldn’t change a thing.
My Advice for Future Wolt Engineering Interns
1. Start by reading the instructions (seriously). Read them carefully until you fully understand what is asked from you and then plan your approach. If you’re thinking about implementing something outside of the instructions, consider keeping your focus on areas that were explicitly requested. Showing that you can deliver exactly what’s asked is more impressive than doing extra.
2. Write thorough test suites to catch issues early. Good tests reveal how well you understand your code. Document your work clearly so reviewers can follow your reasoning and see your communication skills.
3. During the interview, be yourself. It’s okay to be nervous — the interviewers have been where you are and understand how you feel! Be ready to explain your thought process, for example, why you chose one implementation over another and what trade-offs different choices introduce. And be honest if you don’t know something.
4. Ask for feedback early and often. Thinking back to the start of my internship, I’d also tell my past self to seek more feedback from people already working in the industry. There’s so much to learn from their experience.
5. Invest time in building connections. Meaningful relationships are as valuable as technical skills.
6. Protect your well-being. Stay curious about what truly interests you and remember that your well-being will always matter more than your progress as a programmer. When you take care of yourself, everything else — growth, learning, and creativity — naturally follows.
