Bengaluru · On-site

Senior Frontend Engineer (UI) — Observability & Data Visualization

Full-timePosted 13 Aug

Salary: ₹15–30 LPAEstimated
Experience: 5–6 years
Eligible batches: 2024 · 2025 · 2026
Degree: B.E, B.Tech, MCA, M.Tech
Location: BengaluruOn-site

About the role

Senior Frontend Engineer to own the UI of an AI-driven observability platform, building high-density data visualizations and real-time streaming interfaces.

Responsibilities

Own the frontend for our observability and API security consoles end-to-end — architecture, implementation, performance, and iteration after release
Build high-density data visualization: time-series charts, trace waterfalls, flamegraphs, service dependency maps, heatmaps, and virtualized log and event tables that stay smooth at scale
Handle real-time data properly — WebSocket and streaming updates, backpressure, incremental rendering, and sensible behaviour when the data volume spikes
Establish and maintain our design system so the three product surfaces feel like one product rather than three
Make the product work in air-gapped on-premise deployments — no CDN assumptions, no external font or analytics calls, predictable bundle behaviour
Set a real performance bar (interaction latency, memory under long-running dashboard sessions, initial load) and hold the codebase to it
Partner with backend on query and API shape — at this data volume, the frontend's needs have to influence the API design, not just consume it
Raise the bar through code review, testing practices, and mentoring

Free interview prep

Prepare for the interview

All lists

Picked for this role's title and skills: the questions that come up most, each with a short answer to say out loud.

Frontend interview questions40 questions · ≈ 17 min to revise

Asked most often · 19 of 40

React interview questions40 questions · Rendering, Core hooks, More hooks

Eligibility

5–6 years building production web applications, with meaningful time on data-heavy or dashboard-style products
Strong JavaScript and TypeScript — you understand the runtime, not just the framework
Deep React experience, including the parts people avoid: render performance, memoization that actually helps, virtualization, and profiling real bottlenecks
Hands-on data visualization work with something like D3, ECharts, uPlot, visx, Recharts, or Canvas/WebGL directly — and the judgment to know when SVG stops being viable
Solid CSS: dense information layouts, responsive behaviour, and a modern styling approach (Tailwind, CSS Modules, or CSS-in-JS)
Practical experience with real-time data in the browser — WebSockets, SSE, polling strategies, and the state management that comes with them
Comfort consuming complex REST or GraphQL APIs, including caching, pagination, error and empty states
Modern build tooling (Vite, Webpack), testing habits (Vitest/Jest, React Testing Library, Playwright or Cypress), and CI/CD
Accessibility fundamentals — semantic HTML, keyboard navigation, WCAG 2.1 AA
Comfort with ambiguity and enough product sense to push back on a spec that won't work for an engineer at 3 am

Skills

JavaScriptTypeScriptReactNext.jsD3EChartsuPlotVisxRechartsCanvas/WebGL

Resume keywords

Terms from this listing. Many screening tools match exact words, so mirror the ones you genuinely have.

Asked for

JavaScript
TypeScript
React
Next.js

Nice to have

D3
ECharts
Uplot
Visx
Recharts

Tailor my resume with these

Benefits

Opportunity to work on a cutting-edge observability platform
Collaborative and dynamic work environment
Professional growth and development opportunities

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About CodeXray

CodeXray is building an AI-guided observability and API security platform.

11-50 employees · HQ Bengaluru, India

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