Full Stack Developer Frontend-Focused JavaScript, WARSZAWA

• Full-stack
  JavaScript development experience (3+ years) delivering production web
  applications.


• Strong
  experience with a modern frontend framework: React or Angular (or
  similar).


• Solid understanding of Redux/Flux
  state management patterns (or equivalent state management approaches).


• Strong understanding of Functional
  Programming and Object-Oriented Programming paradigms, and when
  to apply each.


• Practical experience
  building backend services with Node.js and Express (REST
  APIs, middleware, routing, error handling).


• Strong
  knowledge of SQL and relational database design; ability to
  optimize queries and data access patterns.


• Experience
  with CI/CD practices and tools; familiarity with release
  automation.


• Experience
  with Docker and container-based workflows.


• Working
  knowledge of testing practices: unit testing and E2E automation
  (tools/frameworks appropriate to your stack).


• Proven
  ability to collaborate effectively, communicate clearly, and take
  ownership of deliverables.

Desirable Skills (Nice to Have)

• Experience
  with observability/monitoring tools such as Splunk, ELK stack,
  Grafana/Prometheus, and metrics instrumentation.


• Some
  experience with Java and/or Python for backend services,
  integrations, or scripting.


• Exposure
  to high‑performance, low‑latency systems or financial services/trading
  domain.

Qualifications

• Bachelor’s
  degree in Computer Science, Engineering, or related field (or equivalent
  practical experience).


• 3+
  years of professional experience in full-stack development.


• Strong
  problem-solving skills and attention to performance, reliability, and
  maintainability.

Cantor is a global financial services firm with over 75 years of history, known for its entrepreneurial culture, independence, and focus on innovation. Founded in 1945, the firm provides investment banking, capital markets, trading, research, and advisory services to institutional clients worldwide.

As part of its international growth, Cantor has opened a new office in Warsaw, creating a new technology hub that supports global initiatives and works closely with international teams. The Warsaw (Poland) office plays an important role in the company’s long‑term development and future growth.

Work arrangements:

• This is a hybrid role based in Warsaw, with three days per
  week in the office. For candidates located outside of Warsaw, we are open to
  remote contract arrangements.
• The role is offered primarily as a permanent contract
  (Umowa o Pracę - UoP). B2B contracts are also available.
• Salary range: 20,000 PLN - 30,000 PLN (depending on experience
  and contract type).

,[ Develop and maintain full-stack web applications supporting trading and brokerage workflows., Build responsive, high-performance web interfaces using a modern framework (e.g., React, Angular, or similar)., Implement and optimize server-side components using Node.js (including Express) for speed, scalability, and reliability., Drive client-side and server-side performance tuning to support low-latency user experience., Work with SQL databases for data persistence, data modeling, and query optimization., Build and maintain CI/CD pipelines and deployment automation., Containerize applications using Docker for streamlined development and deployment., Implement and maintain unit tests and end-to-end (E2E) test automation to ensure quality and reliability., Collaborate with engineers and stakeholders to deliver robust, user-friendly solutions in an Agile environment.] Requirements: JavaScript, React, Redux, Node.js, Express, Angular, Java, Python Additionally: Sport subscription, Training budget, Private healthcare, Flat structure, International projects, Free coffee, Gym, Canteen, Bike parking, Playroom, Free beverages, Modern office, Startup atmosphere.