Senior Application Engineer

Dear Candidates,Simple Logic IT Pvt Ltd is hiring for Sr. Application Engineer (Node.js + React) role at Noida.Please find the job details below:Position : Senior Application Engineer – Node.js + ReactExperience : 4–7 YearsLocation : NoidaWork Mode : Work from OfficeRole : Senior Individual ContributorBackend/Frontend Split: Approximately 70% Backend / 30% FrontendNote: The final round will be conducted at the Noida Office.Key Responsibilities:Design and develop APIs, data models, and integrations using Node.js and TypeScript.Develop and maintain production backend services and REST APIs.Work extensively with PostgreSQL, including schema design, indexing, migrations, and transactions.Develop scalable services with appropriate timeout, retry, idempotency, and concurrency mechanisms.Troubleshoot and debug production issues, including CPU, memory, and event-loop performance.Implement monitoring using metrics, structured logging, and tracing.Develop React interfaces and integrate them with backend APIs.Handle data fetching, application state, forms, validation, accessibility, and performance.Participate in code reviews, mentoring, production support, and on-call activities.Independently take requirements from idea/discovery through design and implementation.Mandatory Skills:Strong hands-on experience with Node.jsTypeScript / JavaScriptExpress / NestJS / FastifyPostgreSQLREST API development and API designReact + TypeScriptProduction support / incident handling experienceGit, CI/CD and DockerStrong problem-solving and independent ownership4–7 years of experience building and operating production backend servicesGood-to-Have Skills:KubernetesTerraformAWS / GCP / AzureKafka / RabbitMQ / SQS / Redis StreamsRedis and cachingOpenTelemetryPrometheus / Grafana / DatadogNext.js / Micro-frontends / Module FederationExperience in FinTech, Payments, Identity, or other regulated/high-trust domainsImportant: This is a backend-heavy role, with approximately 70% backend and 30% frontend. Candidates should have strong Node.js/TypeScript experience and should not be primarily frontend-focused.