Middle/Senior Software Engineer (Frontend)

Job Description We are looking for a Middle/Senior Software Engineer (Frontend) to work at Halcyon Labs. We’re building projects of different complexity – from chrome extensions to full-blown capital markets trading applications. Technology stack includes, but is not limited to: TypeScript / React / various CSS libraries and A11y components. Backend includes Python Django an Golang. Claude Code experience is a bonus. We expect the Software Engineer to: Be a team-player, collaborate efficiently, give timely answers and updates, Be able to understand the business value and set correct priorities, Have an ability to take ownership of codebase and tasks up to completion, Participate in daily meetings, perform core reviews and follow company standards, Create applications with quality in mind. Qualifications Must-have skills: Deep knowledge of JS core, TypeScript and React hands-on experience, Proficiency in HTML / CSS, including advanced practices (semantic HTML and Accessibility), Understanding of how modern Web works (HTTP, WebSockets, Cookies), English – spoken and written. Nice-to-have skills: Claude Code or any other agentic AI experience Unit and end-2-end testing (Jest / Cypress / Playwright), Web performance analysis (DevTools profiling / Web Vitals), Experience or understanding of fp-ts library, Experience with building WCAG a11y components. Salary: 4000 - 7000 EUR gross / month. Please keep in mind that we are flexible and open to discussing another salary based on your skills and experience. Company Description Halcyon Labs works with respected financial institutions, delivering products and tailor-made solutions for retail and brokerage houses, exchanges, and buy-side firms. The company focuses on trading platforms and brokerage automation, complex software development projects, market data products, and IT consulting services. Additional Information Care for the employees is one of Halcyon Labs' core values. For the suggested position, we offer a benefits package that will guarantee the comfort of our new teammate. Flexibility benefits: Possibility of hybrid/remote work mode, Flexible working hours. Health and recreation benefits: 20 days of paid vacation, Fully paid additional wellness days (3 days per working year), Medical insurance, Sport compensation. Facility benefits: Modern office with new equipment, Parking spaces, Free drinks and snacks. Community benefits: Teambuilding activities, Corporate parties, Speakers' club, Free admission to corporate external events, Possibility of joining conferences and professional fairs, Personal branding development support. Professional training benefits: Unlimited access to self-learning platforms, Certification opportunities, Mentorship Program. Social benefits: Parental bonus, Referral bonus, Gifts for employees, Gifts for children.