Our client is a US-based hedge fund, investment management division of one of the largest banks in the world. For nearly 30 years they are leaders in custom solutions with 400+ billion dollars spread across global equity, bond, and derivative markets.


We are looking for JavaScript Front-end developer who will be working in a small team of experts that will focus on recreation of existing ExtJS UI web components using React + MUI + AgGrid. Due to compliance and other constraints from the client whole team will be working from our office in Poland - you can choose between Lublin or Wroclaw.

Very well

  • Recreate a portion of existing ExtJS UI with the focus on architecture and base components using latest React + MUI + AgGrid.
  • Collaboration with ExtJS developers to learn from and challenge each other
  • Encourage the business to bring up ideas on how to improve the UI
  • Implement automated UI testing and make it a part of CI/CD


  • Extensive knowledge of ReactJS, MUI, AG Grid
  • JavaScript frontend architecture experience
  • Familiarity with RESTful APIs and/or GraphQL
  • Desire and commitment to developing effective UIs
  • Great understanding of the Software Development Life-Cycle (SDLC)
  • Excellent problem-solving skills and attention to detail
  • Great communication skills, spoken English

Nice to have

  • Experience with micro-frontends, Web Components, and other modern frameworks/libraries (Single SPA, Svelte, Lit, …)
  • Experience with ExtJS, Ext.Net, GXT, Sencha Touch, Sencha Test
  • JavaScript certifications

Packages and extras

  • Healthcare package
  • Healthcare package for families
  • Leisure package
  • Language courses
  • Conferences
  • Trainings
  • Books

Relocation package

  • Temporary housing
  • Visa Services
  • Adaptation tips


  • Cold beverages
  • Hot beverages
  • Fruits
  • Snacks
  • Shower
  • Chill room
  • Integration events

HR Interview
Tech+Project Interview
Client's Interview



DataArt is a global software engineering firm that takes a uniquely human approach to solving problems. With over 20 years of experience, teams of highly-trained engineers around the world, deep industry sector knowledge, and ongoing technology research, we help clients create custom software that improves their operations and opens new markets. Powered by our People First principle, we work with clients at any scale and on any platform, and adapt alongside them as they evolve.

We integrate our engineering excellence with deeply human values that drive our business and our approach to relationships: curiosity, empathy, trust, honesty, and intuition. These qualities help us deliver high-value, high-quality solutions that our clients depend on, and lifetime partnerships they believe in.

DataArt has earned the trust of some of the world’s leading brands and most discerning clients, including Nasdaq, Travelport, Ocado, Centrica/Hive, Paddy Power Betfair, IWG, Univision, Meetup and Apple Leisure Group among others. 


  • 5000+ professionals.
  • 25 years in operation.
  • 26 offices in the USA, Europe, and Latin America.
  • 13 countries.
  • <10 % attrition rate.
  • 31% women.
  • Glassdoor review score — 4.8.

Team satisfaction survey 2020

  • 95 % of our team members are ready to recommend us as a good employer to their friends.
  • 92 % of our team members are ready to spend 2+ more years of their career with us.
  • 75 % are satisfied with their total deal with DataArt.


  • Argentina.
  • Armenia.
  • Bulgaria.
  • Poland.
  • Ukraine
  • Georgia.


  • Finance.
  • Healthcare & Life Sciences.
  • Retail & Distribution.
  • Travel, Transportation & Hospitality.
  • Media & Entertainment


People and relationships are the foundation of our success. We invest in long-term relationships, with our colleagues and clients alike. We’re a global technology consultancy with deep tech and domain expertise. We embrace change and foster an environment of experiment and learning which lets us illuminate our talents and apply them within our ecosystem.

PEOPLE FIRST: our relationships with clients and colleagues are based on mutual respect, no matter our differences.

EXPERTISE: open up your potential within DA ecosystem.

FLEXIBILITY: experiment and learn, embrace change.

TRUST: is at the core of our relationships with partners and colleagues. We lead via context and let professionals do their work the best they can.

Our policy of equal opportunities in employment

We are committed to promoting equal opportunities in employment. You and any job applicants will receive equal treatment regardless of bias including age, disability, gender reassignment, marital or civil partner status, pregnancy or maternity, race, color, nationality, ethnic or national origin, religion or belief, sex or sexual orientation. DataArt is committed to providing a working environment free from harassment and bullying and ensuring all staff are treated, and treat others, with dignity and respect. Our commitment to promoting equal opportunities and creating the workplace free of harassment and discrimination is supported by the implementation of respective policies and controls, provides an appropriate environment to encourage good performance and conduct at all its working locations, at all times.