Senior Backend Engineer — TS/Nest.js, AWS, Remote

Vecten; Warszawa; Hybrid; PLN 180,000 - 300,000; Full time

Job summary

Vecten is seeking an experienced backend engineer to design and build a Nest.js-based gateway in AWS, connecting a multi-tenant claims platform to external policy systems. You will work in a small pod with client engineers to map policies, implement secure webhooks, and ensure data isolation.

You will drive canonical data modeling, observability, and onboarding for rapid partner integration while navigating a fast-moving, production-focused environment.

Qualifications

• 5+ years backend engineering with TypeScript in production.
• Experience with Nest.js or a DI-based Node framework.
• Experience building integration services or API gateways.
• PostgreSQL and relational data modelling.
• Experience with multi-tenant systems and data isolation.
• Hands-on AWS (ECS/EKS or Lambda, SQS, S3, IAM, Secrets Manager or Vault).
• AI-native tools as part of delivering (e.g., Claude Code, Codex).
• Self-directed with ability to scope ambiguous requests and deliver independently.
• Fluent English and proactive communication across time zones.

Responsibilities

• Design and build the gateway service on the client's Nest.js-based internal framework and AWS.
• Implement the webhook contract: HMAC authentication, Vault secrets, IP allowlisting, ISO-8601 dates.
• Build the tenant router and registry with composite resolution and failure handling.
• Create the source adapter framework with per-source auth, timeouts, retries, and circuit breaking.
• Establish batch paths: SFTP landing zones, file validation, and data loads to PostgreSQL.
• Define the canonical policy model and mapping tables; review with client experts.
• Deliver per-tenant observability (logs, metrics, Grafana dashboards) and onboarding runbooks.
• Write isolation tests and run drills; support security review.
• Collaborate with client engineers across time zones; some PT availability may be required.

Skills

TypeScript

Nest.js

Backend engineering

AWS

PostgreSQL

Multi-tenant systems

API gateways / integration services

Terraform

OpenTelemetry

Grafana

Vault

Tools

Terraform

Grafana

OpenTelemetry

Vault

Job description

Vecten is seeking an experienced backend engineer to design and build a Nest.js-based gateway in AWS, connecting a multi-tenant claims platform to external policy systems. You will work in a small pod with client engineers to map policies, implement secure webhooks, and ensure data isolation.

You will drive canonical data modeling, observability, and onboarding for rapid partner integration while navigating a fast-moving, production-focused environment.