Horizon Assset Investments · Anywhere in the World

Front-End Developer (Full-Time, Remote)

frontendmidPubblicata: 2026-04-28

<img src="https://we-work-remotely.imgix.net/logos/0171/4987/logo.gif?ixlib=rails-4.0.0&w=50&h=50&dpr=2&fit=fill&auto=compress" /> Headquarters: Remote URL: <a href="https://www.horizonassetinvestments.com/">https://www.horizonassetinvestments.com/</a> Front-End Developer (Full-Time, Remote)   We are seeking a Front-End Developer to design and build the user-facing components of our high-performance trading platform. You will play a key role in creating intuitive, data-rich interfaces that enable traders and analysts to work efficiently and effectively.   You will collaborate closely with the Back-End Development Team and the Project Manager to deliver seamless, integrated systems. A key factor is the front end developer’s ability to deeply discuss approaches, trade-offs, limitations, and pros/cons with the development team, rather than reliance on any specific pattern or library.   Key Responsibilities <ul> <li class="MsoNormal">Develop and maintain the front-end applications of our trading platform.</li> <li class="MsoNormal">Collaborate with back-end developers and the project manager to ensure smooth integration across systems.</li> <li class="MsoNormal">Design and implement multi-page layouts, menus, and workflows that balance usability with efficiency.</li> <li class="MsoNormal">Contribute to the design and user experience of the trading platform, performance & risk manager, and backtesting engine.</li> <li class="MsoNormal">Implement and optimize charting and data visualization features, leveraging libraries such as TradingView or D3.js to support a wide variety of chart types (tables, multi-line chart packs, etc.).</li> <li class="MsoNormal">Continuously refine the UI/UX to ensure clarity, speed, and intuitive navigation for end users.</li> </ul>   Qualifications <ul> <li class="MsoNormal">Strong communication skills and the ability to collaborate effectively with developers, project managers, and business stakeholders.</li> <li class="MsoNormal">A keen eye for design, simplicity, and efficiency, with the ability to translate complex requirements into clean, user-friendly interfaces.</li> <li class="MsoNormal">Knowledge of financial systems or trading concepts is preferred.</li> </ul>   Core stack (mandatory) <ul> <li class="MsoNormal">React 18 + Next.js (App Router), TypeScript, TailwindCSS.</li> <li class="MsoNormal">Strong command of state management for high-frequency data (e.g., Zustand, Redux Toolkit, useSyncExternalStore).</li> </ul>   Real-time data & performance <ul> <li class="MsoNormal">Hands-on with WebSockets / SSE and reconnection/backoff strategies; handling authenticated socket connections and topic resubscriptions.</li> <li class="MsoNormal">Experience implementing backpressure, buffering, coalescing, and windowing to prevent UI thrash under thousands of updates/minute.</li> <li class="MsoNormal">Data virtualization (react-virtualized, react-window) for large tables (orders, positions, trades).</li> <li class="MsoNormal">Familiar with Web Workers / OffscreenCanvas and message passing to keep the main thread responsive.</li> <li class="MsoNormal">Awareness of latency budgets and frame-time profiling using React DevTools and browser performance tools.</li> </ul>   Charting & visualization <ul> <li class="MsoNormal">Practical experience with professional charting libs (e.g., TradingView Charting Library, Lightweight Charts, Highcharts, D3).</li> <li class="MsoNormal">Real-time overlays: best bid/ask, order book depth, last OHLCV, order/position annotations.</li> <li class="MsoNormal">Multi-pane layouts (price, volume, indicators) with synchronized crosshairs and time scales.</li> </ul>   Architecture & data access <ul> <li class="MsoNormal">Client-side caching and invalidation (e.g., TanStack Query / React Query).</li> <li class="MsoNormal">Schema-driven UI for instruments and venues.</li> <li class="MsoNormal">Use of Error Boundaries, Suspense, and progressive hydration/streaming for large Next.js pages.</li> </ul>   Auth, security, and roles <ul> <li class="MsoNormal">Strong understanding of OIDC/JWT flows, token refresh/rotation, and WebSocket authentication.</li> <li class="MsoNormal">Role-based feature gating (read-only vs trading permissions).</li> </ul> Testing, quality, and reliability <ul> <li class="MsoNormal">Unit tests for critical transforms/parsers (e.g., Playwright/Vitest for E2E/interaction flows)</li> <li class="MsoNormal">Experience with feature flags, staged rollouts, and monitoring with Sentry/OpenTelemetry.</li> </ul>   Nice-to-haves <ul> <li class="MsoNormal">Experience with desktop-class layouts (drag-to-dock panels, resizable grids).</li> <li class="MsoNormal">Exposure to WASM for heavy computations (e.g., indicator calculations).</li> <li class="MsoNormal">Familiarity with FIX/crypto venue nuances (tick sizes, lot sizes, trading sessions).</li> </ul>   Screening Questions Keep answers **4–8 sentences** each. Bullet points allowed if clear.   1) **UI migration (hrzk → Next.js):**  Pick ONE area from the provided `hrzk.html` (e.g., Orders+Trades, Positions table, Equity/Drawdown).  Explain how you’d migrate it to **React 18 + Next.js (App Router) + TypeScript + Tailwind**.  Include folder structure and what you’d make **client vs server components**.  (We care about your trade-offs, not “the one true way”.)   2) **Real-time data ingestion:**  Describe how you’d handle **WebSockets/SSE** for high-frequency updates:  reconnect/backoff, authenticated sockets, and topic resubscriptions.  What failures do you expect in production?   3) **Backpressure + UI thrash prevention:**  Assume **thousands of updates/minute** for orders/positions/trades.  Explain how you’d implement buffering/coalescing/windowing so the UI stays responsive.  Mention how you’d combine this with **state management** (e.g., Zustand/RTK/useSyncExternalStore) and **virtualization** (react-window / react-virtualized).  What would you measure to prove it works?   4) **Charting approach:**  We need fast, readable, data-rich charts (equity/drawdown, doughnut/bars, etc.).  Pick a chart type from `hrzk.html` and explain:  - which charting library you’d choose (TradingView Lightweight Charts / Highcharts / D3 / etc.)  - update frequency strategy  - performance risks + mitigations   5) **Auth + role gating:**  Explain how you’d handle JWT/OIDC token refresh and **WebSocket authentication**, then implement role-based gating (read-only vs trading).  Use an example like “Cancel All Orders” or “Stop/Start Execution”: when do you hide vs disable vs show a warning?   6) **Remote ownership + teamwork:**  Give one example where you took ownership remotely on an ambiguous task.  Then describe how you’d work with a small dev team: how you ask clarifying questions, communicate risk early, and avoid shipping “local optimum” code that breaks other parts of the system.   What to expect (our interview process):   Our hiring process is mostly async and focused on real work. You’ll start with a CV submission and a short, structured application. Shortlisted candidates complete an async technical screen. Finalists complete a paid, time‑boxed work sample aligned to the role. End‑to‑end, the process typically runs 4–6 weeks.   FAQs ·       Do I need to respond to the questions? Yes, please respond to the questions ideally in an open format via a cover letter. This is mandatory for vetting. ·       Do I need to attend live interviews? Most stages are async to reduce scheduling friction. Live calls are minimal. ·       Do I need to be on camera for the sample work? No — screen + voice is sufficient. ·       What tools can I use to submit recordings? Any common screen‑recording or file‑sharing tool is fine, as long as the video is easy to view. ·       Is the final task paid? Yes. Final shortlisted candidates complete a paid, time‑boxed work sample. To apply: <a href="https://weworkremotely.com/remote-jobs/horizon-assset-investments-front-end-developer-full-time-remote">https://weworkremotely.com/remote-jobs/horizon-assset-investments-front-end-developer-full-time-remote</a>

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