Svelte UI Developer (f/m/x)

3 999 - 7 555 USDNet per month - B2B
2 777 - 4 999 USDGross per month - Permanent
JavaScript

Svelte UI Developer (f/m/x)

JavaScript
-, Kraków +13 Locations

Sii

Full-time
B2B, Permanent
Senior
Remote
3 999 - 7 555 USDNet per month - B2B
2 777 - 4 999 USDGross per month - Permanent

Job description

We develop our product offering to help wealth management to serve their clients' portfolios. For this, we build scalable solutions that need to perform with a rich history of financial data. We specialize in being breadth of offerings to support smaller firms' needs to serve their users well with a highly configurable solution with many functions.

Our platform has been built over years of experience in the portfolio management domain. We enhance business functionalities as well as strengthen our technology to scale operationally with low cost of ownership and high quality. For this work, we are looking for further Software Engineers to become full members of our team and take the tasks at hand from the Scrum backlog.

Your tasks

  • Design and develop front-end components and windows for IPT/IOM trading workflows using modern Svelte / SvelteKit, with a focus on real-time responsiveness, interoperability and minimal latency

  • Write testable, maintainable code with appropriate unit and component-level tests, and contribute to the team’s continuous integration pipelines

  • Apply modern tooling and champion clean-code and performance standards across the front-end codebase

  • Contribute to code reviews and help raise the team’s engineering standards around component architecture, accessibility, and maintainability

  • Integrate UI components with IPT/IOM back-end services and other upstream/downstream trading systems via REST, WebSocket, and messaging APIs

  • Iterate rapidly — prototype, refine, and ship new features on tight timelines, working directly with traders and squad stakeholders to validate behaviour

  • Operate on Linux: shell navigation, log inspection, process control, and remote workflows

  • Provide front-line support for UI issues in production trading installations, diagnosing problems quickly and delivering fixes with minimal disruption to live trading

  • Act as a close partner to back-end engineers, product owners — translating operational feedback into concrete UI/UX improvements

  • Champion UX quality by applying strong usability, layout, and interaction judgment to data-dense, high-frequency-use interfaces

Requirements

  • Solid hands-on, more than 5 years of experience building production applications with Svelte (and/or SvelteKit), including component architecture, stores, reactivity, and lifecycle management

  • Strong command of modern HTML, CSS, and JavaScript/TypeScript, along with browser APIs, async patterns

  • Demonstrable sensitivity to usability, layout, and interaction design — particularly for data-dense, high-frequency-use professional interfaces

  • Comfortable with basic Linux operations — shell navigation, package management, log inspection, process control, and remote development workflows

  • Fluent English, both written and spoken

  • Polish at a communicative level

Tech stack

    Polish

    B1

    English

    C1

    Svelte

    advanced

    JavaScript

    advanced

Office location

About the company

Sii

Sii Polska to czołowy dostawca doradztwa technologicznego, transformacji cyfrowej oraz usług biznesowych i inżynieryjnych. Firma obecna jest na rynku od 2006 roku, zatrudnia ponad 7 500 ekspertów, jedenastokrotnie zdobył...
Company profile

Svelte UI Developer (f/m/x)

3 999 - 7 555 USDNet per month - B2B
Summary of the offer

Svelte UI Developer (f/m/x)

-, Kraków
Sii
3 999 - 7 555 USDNet per month - B2B
2 777 - 4 999 USDGross per month - Permanent
By applying, I consent to the processing of my personal data for the purpose of conducting the recruitment process. Wyrażam zgodę na przetwarzanie moich danych osobowych zamieszczonych w niniejszym CV przez Sii sp. z o.o. z siedzibą przy Al. Niepodle... MoreThis site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.