Software Developer

Role OverviewSimfluent's platform automates the full recruitment lifecycle across five AI agents, a 22-stage candidate pipeline, and integrations with Lever ATS, SendGrid, and multiple job boards. As a Software Developer on the Platform team, you will build and own features across the backend API, async worker infrastructure, and third-party integrations that keep the platform running for enterprise tenants.Four years of experience means you have shipped real features in production, you understand why tests matter, and you can design a data model before you open your code editor. You work independently on well-scoped problems, raise quality concerns early, and know when to ask for help before a decision becomes expensive to reverse. This is a backend-first role with a strong Python focus.

Responsibilities

API Layer: Build and maintain REST API endpoints using FastAPI — recruiter pipeline actions, candidate management, job configuration, and third-party integration <webhooks.Data> Modelling: Design and implement PostgreSQL data models — schema design, indexing, query optimisation via EXPLAIN ANALYZE, and Alembic migration management for new features.Multi-Tenancy: Build and maintain multi-tenant data access patterns — every query correctly scoped by tenant_id, no cross-tenant data leakage, new features inherit the isolation model from day one.Async Workers: Implement async worker tasks using AWS SQS and Celery — task design, retry logic, idempotency, and dead-letter queue handling for pipeline automation flows.Integrations: Build and extend third-party integrations — Lever ATS webhooks, SendGrid outbound and inbound parse, IMAP polling for the job-watch inbox, and AWS S3 for document storage.Testing: Write comprehensive test coverage — unit tests, integration tests, and async/webhook handler tests as a standard part of your workflow.Code Reviews: Participate in architecture discussions, code reviews, and technical documentation — raising quality concerns clearly and constructively.On-call: Contribute to on-call rotation — diagnose and resolve production incidents, write runbooks, and conduct post-mortems.

Requirements

PythonFastAPIasyncioSQLAlchemyPydanticPostgreSQLDatabase Schema DesignDatabase IndexingEXPLAIN ANALYZEAlembicMulti-tenant ArchitectureAWS SQSCeleryMessage Queue SystemsREST API IntegrationOAuthWebhookspytestAsync Testing PatternsSystems Design

Preferred Skills
ReactpgvectorVector DatabasesAWS BedrockLLM IntegrationMulti-tenant SaaS ArchitectureNew Skil

Qualifications

4 years of Python backend engineering experience in production environmentsProduction-grade service development experience (not scripts)Experience with async programming using asyncioStrong database design and optimization skillsExperience with async task systems (SQS, Celery, or RabbitMQ)Experience building third-party API integrationsStrong testing discipline with comprehensive test coverageSystems thinking approach to software designUnderstanding of failure modes, edge cases, and observability