Results for “backend”

Implement simple feature flags in [stack] without a paid service. Support on/off, percentage rollout and per-user overrides, store flags in [storage], and show how to use a flag in code and remove it cleanly later.

Add a background job queue to my [framework] app for tasks like [tasks]. Recommend a queue library, show job definitions, retries with backoff, failure handling, scheduling, and how to run workers in production.

Set up a [Supabase/Firebase] backend for [app]. Include the data model, authentication, row-level security or security rules so users only access their own data, example queries from the client, and storage for user uploads.

Implement [infinite scroll / cursor pagination] for a list of [items] in [framework] calling [API]. Handle loading and error states, avoid duplicate requests, preserve scroll position, and include the backend query for cursor pagination.

Build a file upload feature in [stack]. Show a progress bar, validate file type and size on client and server, store files in [storage], generate safe file names, and return a URL. Explain security considerations.

Implement a real-time [feature, e.g. chat / live notifications] using WebSockets in [stack]. Include server setup, client connection with reconnect logic, message format, authentication, and how to scale beyond one server.

Design a GraphQL schema for [domain, e.g. a blog with posts, authors and comments]. Include types, queries with pagination, mutations, input types, and example resolvers in [language/framework]. Note how to avoid N+1 queries.

Write a FastAPI endpoint for [operation, e.g. creating an order]. Use Pydantic models for request and response, validate [fields], return proper status codes, handle errors, and include an example request with curl and a pytest test.

Act as a backend engineer. Stack: [details] Endpoints to protect: [list] Limits wanted: [e.g. 100 requests/minute per API key, 5 login attempts per 15 minutes per IP] Infrastructure: [single server / multiple instances / Redis available] Implement rate limiting (explain fixed window vs sliding window vs token bucket),…

Act as a QA-minded backend engineer. Framework and test tool: [e.g. Jest + Supertest, pytest + httpx, PHPUnit] Endpoints: [list with expected behaviour] Auth: [method] Database setup: [test DB, fixtures] Write integration tests covering success cases, validation errors, auth failures and not-found cases, with setup/te…

Act as a backend developer. Framework/tool: [Laravel, Django, Rails, Prisma, Alembic, raw SQL] Database: [PostgreSQL/MySQL] Change needed: [e.g. add column, rename table, split a field] Table size: [rows] Write the up and down migration, any data backfill, how to deploy it safely without downtime (e.g. expand-and-cont…

Act as a senior engineer who mentors candidates. Target role and level: [e.g. mid-level backend engineer] Target companies: [types] Interview date: [date] Strengths and weak spots: [details] Hours per week: [hours] Create a study plan covering data structures and algorithms (topics by priority), system design, languag…