Elsa AI

Senior Full-Stack Engineer

Elsa Widget & Backend Console

Location: Remote (Workday overlap ±3 hrs from IST)

Engagement: 4-month contract → option to convert to FTE

Start: Immediate — first deliverable is the 1-week MVP sprint covering both the in-page Widget and the multi-tenant Admin Console

About the company

Elsa gives any dApp an AI concierge that can answer knowledge-base questions and build & submit on-chain transactions directly inside a chat bubble. You'll own the next leap: a production-ready Widget + Console stack that partners can drop into their sites and operate without touching code.

What You'll Own

Front-end — Widget Client (35%)

Built with Next.js 14 and React 18, embedded via an asynchronous script

  • • Minified Loader: elsa.js (< 25 kB gzipped)
  • • Chat iFrame: PostMessage handshake, streaming GPT-4o responses
  • • Theme API: Customizable logo and color palette, RTL support
  • • Accessibility & Performance: a11y compliant with Lighthouse scores ≥ 85

Back-end — Admin Console & Public APIs (35%)

Built with Django 5, Django REST Framework (DRF), Channels, and Celery

  • • Admin Features: Project wizard, knowledge-base uploader
  • • APIs: REST + SSE/WebSocket endpoints (JWT-scoped and rate-limited)
  • • Background Tasks (Celery): index_doc, monitor_tx, analytics cron jobs
  • • Query and transaction logs, metrics dashboard

Blockchain & AI glue (15%)

  • • Transaction Builders: prepareTx implementations for EVM and Solana
  • • AI Data Layer: Pinecone vector upsert with RAG-based prompt templating
  • • Error Intelligence: LLM-powered transaction-error summarizer

DevOps & Observability (10%)

  • • CI/CD Pipeline: GitHub Actions → Docker builds → Deployments
  • • Data & Monitoring: PlanetScale (MySQL) + Upstash (Redis) clusters
  • • Quality & Security in CI: k6 load-testing and OWASP-ZAP security baselines

Security & QA mentoring (5%)

  • • Security for Integrators: Automatic CSP/SRI generator
  • • Access Control: Object-level RBAC via Django Guardian
  • • Testing & Coverage: Comprehensive Playwright and pytest suites with ≥ 90% coverage

Tech You'll Touch

  • • FE: Next 14 (App Router), React 18, Tailwind, shadcn/ui, SWR, Victory charts
  • • BE: Python 3.12, Django 5 + DRF, Celery, Redis 7, MySQL 8, Channels
  • • AI / Data: OpenAI embeddings, GPT-4o streaming, Pinecone, PDFMiner
  • • Blockchain: web3.py, solana-py, EIP-1193 wallets, ethers.js signatures
  • • Ops: GitHub Actions, Docker, Vercel, Render, PlanetScale, Upstash, Sentry

Must-Haves

  • • 5+ yrs shipping production systems in Python/Django and React/Next.
  • • Real-time experience (WebSockets/SSE) plus background jobs (Celery/Sidekiq).
  • • Strong SQL schema design & query optimisation.
  • • Hands-on with at least one blockchain stack or a deep willingness to learn fast.
  • • Proficiency in CI/CD pipelines and containerised deployments.
  • • Security mindset: JWT, CSP, CSRF, secret rotation, least-privilege RBAC.
  • • Comfortable reading OpenAPI & swaggering your own endpoints.
  • • Clear written communication; able to turn a PRD into epics & stories.

Nice-to-Haves

  • • Previous work embedding third-party widgets (Intercom, Stripe Elements, etc.).
  • • Retrieval-Augmented Generation pipelines in production.
  • • Solidity or Rust smart-contract basics.
  • • Vercel edge functions, Render Blueprints, or similar PaaS chops.
  • • Design sensibility with Tailwind/shadcn for snappy admin UIs.

First-90-Day Scorecard

  • • Week 1: MVP widget & console sprint passes ACs from PRD.
  • • Week 4: p95 < 500 ms across `/chat/query` & `/tx/prepare`; testnet swap confirmed via widget in staging.
  • • Week 8: ≥ 90% automated test coverage; 0 High issues in ZAP & Snyk on main.
  • • Week 12: Multi-tenant console handles 50 projects, 100 RPS load test at p95 < 750 ms.

How We Work

  • • Async-first: Jira Kanban, daily Slack check-ins, weekly retro.
  • • Ship thin slices: preview deploys on every PR.
  • • Code buddy reviews: no lonely merges.
  • • Blameless post-mortems: bugs happen; we learn fast.

Interview Flow

  • • 30 min culture/fit call
  • • 90 min tech deep-dive — pair on building a Celery task & WebSocket handler
  • • 60 min system-design — architect the widget–console–blockchain flow
  • • Offer within 48 hours

How to Apply

Send the following to [email protected]

Subject: Full‑Stack — Widget + Console

  • • A short note (≤ 200 words) on why you'll nail this role.
  • • Links to code samples or demos that showcase your Django + React expertise.
  • • Your resume or LinkedIn profile.

Help us build the layer that lets every dApp talk, transact, and support users in one elegant bubble.