Senior Backend Engineer

location

English level: Upper-Intermediate

work type

Work type: Office/Remote

level

Technical Level: Senior

Project Overview:

We are seeking a Senior Backend Engineer with strong expertise in Node.js, TypeScript, and AWS Lambda to build a decoupled serverless application. The role focuses on implementing plan management endpoints with Fastify and ts-rest, designing a SQL Server schema with Prisma migrations, and building a deterministic calculation engine covering forecasts, SMV, derived metrics, and goal deltas — while integrating internal APIs with caching, retries, and circuit-breaker patterns, wiring the full AWS infrastructure via Serverless Framework, and ensuring quality through thorough unit and integration tests.


Customer Overview:

USA influencer marketing platform for organizations looking to advance their creator marketing. Its enterprise-grade technology and industry-leading intelligence facilitate scaled creator discovery, streamlined workflows, and robust reporting, while ensuring compliance and brand safety.


Responsibilities:
  • Implement plan and plan-item endpoints with Fastify + ts-rest, validated by Zod schemas shared with the frontend.
  • Build the deterministic calculation engine (forecast → adjustment → SMV → derived metrics → totals → goal deltas), including BRD edge cases (Twitch avg_concurrent_views, payout exclusivity, missing-data defaults).
  • Design the SQL Server schema and Prisma migrations; ensure reviewable raw-SQL output for the DBA team.
  • Build adapters for Lists/Collections and Campaign Service with caching, fallbacks, circuit-breaker, and structured error handling.
  • Integrate AWS infrastructure (API Gateway, Lambda, RDS, ElastiCache, Secrets Manager, S3) via Serverless Framework; wire Coralogix logs/metrics/traces.
  • Write thorough unit and integration tests, especially around the calc engine; pass Trivy + SonarQube gates in CI.

Skills/Requirements:
  • 4+ years with Node.js and TypeScript in production backend services.
  • Hands-on AWS Lambda + API Gateway, comfortable with serverless tradeoffs (cold starts, 30s/10MB limits, concurrency).
  • Experience with Prisma (or comparable ORM) and a relational database; SQL Server experience a plus.
  • Strong API design background — REST + JSON Schema/Zod/OpenAPI — and integration patterns (caching, retries, circuit breakers).
  • Comfortable with Serverless Framework / IaC and GitLab-style CI/CD.

Nice to have:

  • Fastify and ts-rest experience specifically.
  • Background in calculation/forecasting engines or financial/analytics computations.
  • Familiarity with Coralogix or comparable APM/log platforms.

Apply Now

    Liudmyla Spilnyk

    Recruiter in JetSoftPro

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