Backend Developer / Backend Engineer

You will own the backend and rendering plane that powers our SEO optimization platform: headless browsing at scale, high-quality extraction/crawling, resilient APIs, and secure preview delivery.

You’ll turn complex crawling and AI workflows into clean, observable services with clear SLAs and cost controls - so mid-sized engineering teams can integrate via SDK or API in minutes.

What you’ll build

● Rendering Workers: Playwright/Puppeteer jobs that fetch full DOM, handle lazy-loads, retries/backoff, and emit stable HTML snapshots + signals (title/meta/H1/H2/links/JSON-LD).

● Crawl Orchestrator & Queues: Frontier management (dedupe/normalization), per-host concurrency, jittered retries (429/5xx), idempotent jobs (Redis Streams/SQS/PubSub).

● Core APIs: FastAPI/Node endpoints for /by-url/•, /crawls, /pages, /schema, /authors, /links, /gsc, /exports with OpenAPI, pagination, caching, and rate limits.

● Integrate Cloud AI (OpenAI) adapters for page classification, schema generation, and author E-E-A-T enrichment.

● Preview & Page Serving: Secure “live preview” injector with <base> handling, CSP/nonce safety, and HMAC-signed integration for customer sites.

● Schema & Linking Services: Template/validator (schema.org, null-collapse), internal-link “4 power + 1 new” recommender, exports (CSV/NDJSON).

● User & API Access Plumbing (backend side): API key validation, scopes, quotas, usage metering hooks. Responsibilities

● Design data models (pages, crawls, recommendations, schema, GSC aggregates) and ship migrations.

● Implement resilient workers (timeouts, retries, circuit breakers) and backpressure with clear SLOs (p95 render, error budget). Confidential - For internal use only; not for external distribution or disclosure.

● Expose OpenAPI-first REST services with auth (OAuth2 client-creds/API keys), HMAC verification, CORS, and rate limiting.

● Optimize performance and cost: 72h HTML cache, AI digest caching, safe concurrency, minimal token usage.

● Build observability: OpenTelemetry metrics/traces/logs; dashboards for queue depth, render latency, and AI token spend.

● Partner with SaaS/frontend to wire Admin Console flows, previews, exports, and developer-friendly docs.

● Design for 95th percentile render time <4s and crawl concurrency scaling to 50+ parallel workers.

● Works closely with the SaaS/UI team to deliver APIs and SDK-ready outputs.

Minimum qualifications

● 5+ years building backend services in TypeScript/Node and/or Python/FastAPI.

● Hands-on production experience with Playwright or Puppeteer (navigation, waits, routing, auth, proxies).

● Strong with queues (Redis Streams/SQS/PubSub), idempotency patterns, and job orchestration.

● Solid SQL data modeling (Postgres/SQLite), indexing, and query tuning.

● API security: HMAC signing, OAuth2 client-creds, rate limiting, CORS, secrets management (KMS/SM).

● Swagger/OpenAPI, REST APIs, microservices; comfort with serverless AWS services where pragmatic. Nice-to-haves

● React/TypeScript familiarity for small admin/preview tools (or to partner closely with the SaaS UI).

● SEO extraction: schema.org parsing/validation, JSON-LD generation.

● GSC data ingestion/aggregation; embeddings/NLP awareness for future link relevance.

● Edge/page serving, HAR/network introspection, web-layer security and CSP/nonce patterns.

● Redis (cache/queues), Docker/K8s, HPA on queue depth;.

● Willingness to learn and integrate Cloud AI thoughtfully (compact digests, caching, guardrails).

• इस फुल टाइम आईटी / सॉफ्टवेयर / डेटा एनालिसिस Job में आईटी / सॉफ्टवेयर / डेटा एनालिसिस में 5 - 6+ वर्षो का अनुभव वाले उम्मीदवारों की जरुरत है।