Senior Full Stack Developer

I’m interested


Krakow, Poland

Job description

We bet we can be a great match

Do you want cool projects focused on online sports betting and gaming? Would you like to work on highly reliable systems with low latency, much like the transactional systems of the best financial institutions, but with fun included? Would you like to work with some of the best Developers, QAs, DevOps Engineers and Project Managers in Krakow?

About us

Working with us, you’ll be at the heart of the technological revolution of one of the world’s most trusted betting and gaming companies. We deal with projects ranging from widgets, desktop or mobile casinos and betting sites. Just to name a few, we process 500 online Sportsbook bets per second each Saturday, which’s the same as orders processed by Amazon UK on its busiest day of the year. We deal with more than 20 million users and 160 terabytes of data daily. Impressed? You can be sure there are many more challenges waiting for you.

Your role in the team

   Collaborating with experienced designers to implement user-facing features in company’s products

   Supporting diverse clients from high powered desktop to tablets and mobile phones

   Optimization of cross-browser web applications

   Delivering end-to-end incremental enhancement from backend to frontend

   Building efficient and reusable systems and abstraction

   Developing prototypes

   Working with microservice on the backend

   Working  on CI/CD

   Keeping the high-level of test coverage in the team across multiple codebase (>95%)

   Including security mindset as part of delivery

   Working on integrating with external systems

   Writing integration tests

Skills needed

  • Experience in similar position
  • Self-reliant, communicative, accurate

Front end skills

  • Very good knowledge of and experience with CSS3, HTML5 (SASS)
  • Good knowledge of JavaScript including TypeScript
  • Knowledge of and experience with React.JS
  • Experience with Responsive Web Design
  • Experience with high traffic projects
  • Attention to details

Back end skills

  • Good knowledge of Java
  • Good knowledge of RDBMS and NoSQL databases
  • Experience with Micro service architecture
  • Experience with Terraform
  • Experience with AWS


  • Knowledge of SVG, Canvas,
  • Experience in visualizations and animations
  • Knowledge of Scrum methodology
  • Experience with Feature Toggles and A/B Tests
  • Experience with micro-frontends
  • Familiarity with Webpack, Babel
  • Familiarity with various microservice patterns
  • Familiarity with Business Process Modelling Notation (BPMN)

What we offer

  • Development opportunities, including IT conferences, internal training, lunch and learn sessions and an individual development budget.
  • Complex work and the chance to make an impact.
  • Mac OS or Windows hardware to choose from.
  • Some opportunities for International travel to our offices in London, Leeds, Stockholm, Malta and Gibraltar (our office is 5 minutes away from the beach).
  • New modern, bright and comfortable office space, with a great working atmosphere, in a collaborative team of amazing people, with forward thinking managers.
  • Competitive base salary and benefits, with fully paid private healthcare (Enel-Med), filly paid Multisport pass, employee referral program, and an extra day off for your birthday.
  • Garden roof terrace, with incredible views of the city, and fresh fruit in the office.
  • Well stocked kitchens with fruit tea, honey and lemon, foamy coffee machine, vending machine with healthy food and salad.
  • Chill out room and gaming room with VR, PS4, FIFA, foosball table, billiards, table tennis, football league, board games, competitions with cool prizes.
  • Meetups, quality questions events, hackathons, we love any chance to share knowledge and have fun.
  • We don’t like our colleagues to go hungry or thirsty, so events are always well catered.
  • Family fun days, charity events (ask us about our scooter racing), company parties and social activities.
  • Flexible working practices.
  • Excellent city centre location with a tram stop right outside the office, and free parking spaces cars, motorcycles and bikes.
  • Relocation costs support for rent and travel, and VISA support. Colleagues from all round the world including Russia, Ukraine, Belarus, Estonia, Brazil, Romania, Ireland, Israel, India, Portugal, United Kingdom, and Libya.


William Hill in Krakow

Our office sits on Kotlarska, and our brilliant building has a range of different workspaces, hangouts and breakout areas to suit your every need. Situated in the centre of Krakow next to Vistula river – we're in the heart of one of the world's most iconic cities. There are parks everywhere, and you can enjoy a walk along Planty, or go to Kościuszko Mound to admire the city from above. With plenty of culture on your doorstep, you'll be spoilt for choice. In fact, why not have a sneak peek around our office with Street View and see if you can picture yourself here.

Join us behind the bet