My resumé

Combined my programming background with my business operations experience and got really good at building intelligent, secure business systems with coding agents. I landed a deal with a construction project management company here in Warsaw to build them a system that ingests building permits, environmental decisions, and pending applications from unstructured public data sources. The first layer rejects documents based on their category, then a second layer, an LLM (large language model), judges the rest just like their best salesperson would. The permits it approves land in their sales pipeline with the investor’s name and phone number. Finding good leads in these public registers by hand would be impossible. Thanks to the system, they’ve found 6-figure sales opportunities.

I started sebastian-sz.com because I think the traditional SaaS (software as a service) model is dying. Coding agents let any company just rebuild the platform it’s been paying another company a subscription for. Now that it’s affordable to build any software they’ve ever dreamed of in-house, companies will start hiring a couple of people whose only job is using coding agents to automate everything with bespoke software. These people will maintain those systems, keep them secure, and keep building more software whenever a process changes, even slightly. I can be that person, and that’s what I’m looking for right now.

sebastian-sz.com

One evening I was looking for a restaurant in Warsaw and noticed that a lot of them have old websites, outdated menu photos buried in Facebook posts that I have to waste 30 seconds digging for because the menu isn’t on their website, and bad photos that make me want to skip the place and find somewhere better to eat.

At the time I was having fun building agent harnesses with coding agents, and I had an idea: a tool that gives restaurants one chat interface, powered by LLMs with vision, to update their website, post photos of new dishes with AI-generated captions, reply to reviews, and update their menu. They just snap a photo of the new printed menu, the vision model reads it, and an LLM adds it to their website and Google Maps. All from one chat, mostly with one click. My reasoning was that if I could make all of this super frictionless, owners and managers would have more time, and more desire, to keep their online presence fresh and accessible, making it easier for new guests to find them and decide to eat there.

giuseppelabs.com ↗

After finishing my master’s, I decided to look for something more hands-on at a large company, to pick up practical business skills. Also, I was no longer a student, so it was time to get real and earn a reliable income. I started out supporting senior digital project managers, coordinating the implementation of new insurtech platforms that let Marsh sell insurance products to our clients’ customers (this is called affinity insurance). For example, LG has an online portal where I can buy an extended warranty for my new LG TV. But to sell insurance, LG needs a licence. Marsh, which has the licence, builds a portal that looks like it belongs to LG and sells insurance products on LG’s behalf (for a nice commission, of course).

Around that time I’d become obsessed with data automation in my free time, and I noticed there was a lot at Marsh to automate. I started automating it and became the go-to person for European Data & Automation initiatives. I helped some teams save time here and there, and made a few large clients happy by giving them interactive data dashboards, so they could see what was going on.

Then I was moved to the Client Engagement team, reporting directly to the European Chief Client Officer. She got me involved in solving operational problems in how we service our clients. I worked with the call-centre lead to find the best call-centre tech stack for new clients, and with the sales leaders to standardise which products get pitched to which clients. Right now I’m mapping claims services in every European country to get the full picture of the claims management tech we use, so that we can systematise how country leaders choose the technology for delivering claims management to our clients. I’m happy I joined Marsh: in one year I’ve learned a lot about digital project management, data and automation, and now large-scale business operations.

When the web-dev contracts from 765 Digital started drying up, I needed to keep my income going, so I found a cool internship in the marketing department at Philips. I supported the marketing managers on their campaigns, mainly by designing newsletters, sending our products out to influencers, creating and logging purchase orders, monitoring our ROAS (return on ad spend), and working with creative agencies on new visual assets for us.

After my exchange semester at the Canadian university, I came back to Warsaw to finish my bachelor’s degree and got a corporate job at HRS, a business travel and events agency. I had my own set of clients who needed to organise frequent trips around the world, and I worked with hotels across Europe, China, the US, and the UAE to arrange large stays and conferences for my key accounts.

Wanted to keep going with business education, so I started a master’s at one of the best business schools in Poland. I really enjoyed the classes, especially the ones on innovation, but what I liked most were the business lab classes. We formed teams and competed in a business simulation game where the goal was to make data-driven decisions and grow the company. The team with the highest profits won.

My first profitable business, started with my friend Roman. We built websites and web apps for small businesses, mainly in Switzerland. Roman had connections from his days as a freelance commercial photographer in Geneva, so he started asking his old clients if they needed websites. I’d been learning front-end development for around two years by then, so I could design and build the websites they needed. We brought in over €10k in profit in the first year, but once the word-of-mouth deals dried up, we struggled to find new clients. We probably could have pushed harder on sales and kept it going, but seeing how good AI was getting at building websites in late 2025 (the Opus 4.5 era), I started doubting that an already crowded industry was sustainable.

765digital.com ↗

During the summer break in France I had a very short episode of needing money and taking the first job that came my way. I ended up assisting at the butchery counter of the local supermarket. It wasn’t the best experience of my life, but the plan was to help out for a month, make some money for Canada, and leave.

In the fifth semester of my bachelor’s degree, I got accepted into a student exchange programme in Canada. I flew to Vancouver two weeks before the semester to look for an apartment. A week before it started, the university announced that because of COVID-19 risks, classes would be held remotely. There was no point staying in Vancouver, where rent is crazy, when my classes were online either way, so I flew to my parents’ house in France. Because of the nine-hour time difference, my classes ran from 1am to 6am.

Moved back to Warsaw in 2021 because my university went back to in-person classes. Started Milky with Janek, a new friend from university. Milky’s mission was to bring the English-speaking underground hip-hop scene into the mainstream in Poland. We organised a couple of small hip-hop events, which never drew more than 15 people, and recorded some content, mainly a music video and an interview. I think we both saw it was going nowhere, so we killed it.

Got my first corporate job. It was kind of like an internal HR call centre for Schneider Electric’s employees in France. They’d call with HR questions in French, and I helped them download their payslips and apply for employee benefits, and approved their sick days based on medical certificates.

I changed universities and majors. I didn’t want to study economics, and all I knew was that I was drawn to business, so I switched to business management. That was much better, and I graduated with a bachelor’s in Business Management in 2023.

Private tutoring was bringing in some cash, but I’d just got my first car, so I decided to spend my evenings delivering food with Glovo, the gig delivery app, to make some extra money. I quickly realised I was spending 50% of my profits on fuel, so it wasn’t sustainable (key business lesson learned).

COVID hit in early 2020 and my university went fully online. There was no point spending money on living in Warsaw when I could move back to my parents’ house in France and join my classes from there. That ended my private tutoring income, so I got a job at the local postal logistics centre, working on the warehouse floor and handling parcels.

Once I graduated from high school, I decided to go back to my roots and move to Warsaw. Warsaw was developing fast: a dynamic but very safe city with plenty of job opportunities. Wages are lower than in the West, but there’s a lot of skilled labour, great living conditions, and good education. That makes it a great place for large companies to open offices, especially R&D centres, where engineers cost less but are highly skilled.

I wanted to make money as soon as I got to Warsaw, so I embarked on my first entrepreneurial endeavour: using the language skills I’d gained growing up abroad to give affordable English lessons to children aged 10–12. Finding clients was quite easy, because I was an (almost) native English speaker and charged half of what a professional tutor did.

I wanted to make money during high school, and apart from the odd gardening gig for my parents’ friends, this was my first real job. Every weekend I woke up at 5am to make the 6am shift, then stacked shelves until 1pm. I was the only 16-year-old in my friend group with my own money, so it felt good.

After four years of French middle school, it was time for high school. By now I spoke French and had friends, and this school was a 20-minute bike ride from home, so things were much better. For my diploma I chose the science track: advanced maths, physics, and biology. I graduated in 2019 with a French international baccalaureate.

Moved to a small French town on the Swiss border, 20 minutes by car from central Geneva. I was 11, which is when kids start “collège” (middle school) in France. I didn’t speak a word of French, and fitting in with the other kids was tough. But the biggest shock was the French school day: first class at 7:50am, last class ending at 5:30pm. School was 40 minutes away by bus, so every day I woke up at 6:15am to catch the 6:50am bus and didn’t get home until 6:30pm. I felt like a factory worker.

My dad got a job in Switzerland, but he wanted to scope out the area first, choose a nice place to live, and find good schools before the whole family moved. So my mom took me and my sister from Gibraltar to live at grandma’s in Warsaw for a year while dad set up base in Switzerland. Huge culture and weather shock once winter came around. Changing schools for the fifth time was a piece of cake by now. I was used to it. Plus, this time I wasn’t the Polish immigrant kid. I was the tan kid who spoke fluent English and lived with monkeys in Gibraltar, so I made friends instantly.

We moved apartments for the third time in Gibraltar, which put me in the upper primary school where most of my friends from St Paul’s had gone. Four schools in four years. New people, new environment, new teachers every time.

Gibraltar’s school system splits primary school from upper primary, and kids move up at the age of eight, so I had to change schools again. Most of the friends I’d made at my previous school went to a different upper primary, because places were allocated geographically: you went to the school closest to where you lived.

After a year in the suburbs of London, my dad got a better job offer and took the whole family to Gibraltar. Moved again. New environment, new school, new apartment. My best childhood memories are from Gibraltar: going to the beach every day after school, and a tight community, which meant lots of friends to play football with and run around the coastal rocks with. It’s so interesting how quickly children learn languages. By the time we settled in Gibraltar, I was already fluent in English.

The first foreign country I ever visited. Except it wasn’t a visit, because we were staying. I was five, so it was time for my first real school. I didn’t speak a word of English, so it was tough at first, but I caught on fast. Some kids were mean just because I was Polish. Back then, the stereotype in England was that Polish immigrants fled Poland to work construction and day-drink on the job.

Spent the first five years of my life in Warsaw, Poland. Around the age of four I started at this preschool, but it didn’t last long: less than a year later, my dad got a job offer in England, so we moved there.