Senior Backend Engineer – TypeScript, Nest.js, AWS

This is a fully remote position, open to applicants in Poland.

📋 Description

• Develop and create a new multi-tenant policy gateway as a Nest.js/TypeScript service within the client's internal framework and AWS environment.

• Suggest infrastructure modifications through Terraform pull requests for implementation by the client's DevOps team.

• Execute webhook contracts featuring HMAC authentication, Vault-managed secrets, IP allowlisting, ISO-8601 date handling, and policy-version selection at the time of loss.

• Construct the tenant router and registry with composite resolution and clearly defined failure behavior.

• Create source adapters with authentication per source, timeouts, retries with backoff, and circuit breaking capabilities.

• Establish tenant-specific SFTP landing zones, conduct file validation and quarantine, and perform idempotent PostgreSQL policy-store loads with snapshot retention and freshness monitoring.

• Define the canonical policy model and develop a shared canonical-to-target mapper.

• Lead the initial partner's field-mapping review alongside the client's claims expert.

• Provide per-tenant observability, including structured logs, metrics, Grafana dashboards, freshness alerts, and error-rate alerts.

• Develop an onboarding runbook for the integration of additional tenants.

• Create isolation negative tests to serve as a release gate.

• Conduct failure-mode drills and end-to-end walkthroughs in the client's sandbox environment.

• Assist with the client's security review and preparation for launch readiness.

• Collaborate directly with client engineers and domain experts across various time zones, primarily in an asynchronous manner.

⛳️ Requirements

• Over 5 years of backend engineering experience with a strong, recent focus on TypeScript in production environments.

• Proficiency with Nest.js or a similar dependency-injection-based Node framework.

• Background in building integration services or API gateways, including webhooks, signature-based authentication, retries, idempotency, circuit breakers, and third-party API adapters.

• Experience with PostgreSQL and relational data modeling; comfortable designing schemas and executing migrations.

• Familiarity with multi-tenant systems or other domains where data isolation is a critical requirement.

• Practical AWS experience with ECS/EKS or Lambda, SQS, S3, IAM, Secrets Manager, or Vault.

• Ability to read and propose Terraform configurations, even if another individual will implement them.

• AI-native working style utilizing tools such as Claude Code and Codex while reviewing every line of code delivered.

• Capability to clarify ambiguous requests, compose concise design notes, ask pertinent questions to clients early on, and deliver results with minimal oversight.

• Fluent in English with clear, proactive communication skills for engaging with both technical and non-technical stakeholders.

• Some availability in the PT timezone, not exceeding once a week.

• Experience in the insurance domain, batch or file-based integrations, regulated data, Grafana/OpenTelemetry-style observability, and prior consulting or client-facing delivery are advantageous.

🏝️ Benefits

• Fully covered licenses for tools such as Cursor, Claude Pro, etc.

• Remote-first working environment.

• No unnecessary meetings, no Jira clutter, and no micromanagement.

• Complete autonomy over your workflow.

• Direct collaboration with the CEO, CTO, VPs, and client leadership.

• Opportunities for continuous growth and a strong culture of knowledge sharing.