Lead Backend / Integrations Engineer (Python, FastAPI, Postgres)

Що робити

Backend architecture and implementation: Python 3.12, FastAPI, SQLAlchemy/Alembic, Postgres, a job queue, workers, webhooks.
The CCH Axcess API module as a server-side job runner: one in-flight job per return, global concurrency limits, exponential backoff on locks, idempotency keys, prompt handling, structured results, parked-job alerts.
Security engineering: PII vault with field-level encryption (KMS), tokenized payload assembly, append-only audit log, RBAC with step-up MFA for sensitive actions, PII-free logging with a redaction layer, secrets manager, backups and restore tests.
Integrations: Stripe (payments, webhooks), an e-signature vendor with identity verification, Google Drive, transactional email, WhatsApp Business API, Anthropic API for document extraction with human confirmation.
Infrastructure as code on AWS (ECS Fargate or App Runner, RDS, S3, KMS, Secrets Manager, CloudWatch) or an agreed managed platform; CI with tests and security scans; staging and production environments; runbooks.

5+ years building Python backends in production, 2+ years as the person responsible for a system's reliability.
Deep Postgres: schema design, migrations, transactions, indexing, point-in-time recovery.
Integrations with unreliable third-party APIs: retries, idempotency, partial failure, long-running jobs with polling.
Security habits: least privilege, secrets management, no sensitive data in logs, dependency hygiene. You can explain how you would design a system where the people who build it never see the data it holds.
Docker; one major cloud; infrastructure as code.

Fintech, payments, accounting, insurance or health-data experience; SOC 2 or ISO 27001 exposure.
LLM API experience (Anthropic/OpenAI SDKs, tool use, structured outputs) or MCP servers.
Experience with XML-heavy enterprise APIs.
Russian or Hebrew (the owner speaks both; not required).
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