4Bell Technology

Job Description

What you’ll do
 ● Design and build scalable services in Java (SpringBoot) and Node.js/TypeScript with clean REST APIs.
● Lead frontend implementation in React (hooks, routing, state management such as Zustand).
● Shape data models for relational DBs (Postgres/MySQL), including indexing, migrations, and query tuning.
 ● Establish service patterns: auth (OAuth/JWT), idempotency, retries/backoff, observability, and cost/perf guardrails.
 ● Raise engineering quality: testing strategies (unit/integration/e2e), CI/CD, code reviews, documentation.
● Collaborate on product discovery; translate user needs into pragmatic technical designs.
What you’ve done
● 5+ years building production systems across Java and JavaScript/TypeScript.
● Delivered API-driven features end-to-end (contract design, versioning, pagination, error models).
● Strong SQL fundamentals (joins, transactions, normalization) and practical ORM experience.
● Solid React fundamentals and API-driven UI development.
Nice to have
● AI features in production (LLM tool use, RAG/embeddings, evaluations/guardrails).
● Working knowledge of telephony/voice (Twilio, SIP/WebRTC concepts).
● OpenTelemetry, security hardening, performance budgets, or cost optimization.