Platform Reliability Architect - Multi-Tenant SaaS

Hammerjack Pty Ltd; Philippines; Remote; PHP 2,500,000 - 4,000,000; Full time

Job summary

Hammerjack Pty Ltd seeks an accomplished senior software leader to drive the next phase of a multi-tenant B2B SaaS platform. You will define production architecture, ensure secure isolation, and oversee end-to-end client workflows, while guiding AI coding agents and maintaining high observability and robust disaster-recovery plans.

The role emphasizes shipping, production ownership, and cost controls across a scalable, secure stack featuring TypeScript, Next.js, Python, FastAPI, and PostgreSQL.

Qualifications

• Eight+ years building production software at senior, staff, or principal level.
• Shipped and operated a multi-tenant B2B SaaS product.
• Strong TypeScript, Next.js, Python, FastAPI, Postgres, SQL skills.
• Proven judgment in multi-tenant architecture, tenant isolation, secrets management, least privilege, security & auditability.
• Deep experience with durable queues, leases, retries, idempotency, dead-letter handling, backpressure, ambiguous-write recovery.
• Experience managing external-provider quotas, throttling, failures, and cost controls.
• Disciplined ownership of database migrations, production observability, incident response, rollback, and disaster recovery.
• Hands-on testing: load, soak, integration, and end-to-end.
• Effective use of AI coding agents without lowering engineering or review standards.
• Willingness to simplify inherited systems and remove unnecessary duplication.
• Must have personally operated production systems, not merely built features that others operated.

Responsibilities

• Establish canonical production architecture, repository, data model, and release path.
• Freeze and harden top three end-to-end client workflows.
• Close gaps in tenant isolation, integrations, testing, recovery, security, and capacity.
• Consolidate or retire duplicate queues, surfaces, scripts, and pipelines.
• Own production releases, canaries, rollbacks, migrations, incident response, and disaster recovery.
• Enforce provider quotas, cost budgets, idempotency, backpressure, and operational telemetry.
• Direct AI coding agents through bounded tickets and review outputs.
• Translate requirements into executable acceptance contracts.
• Produce an evidence-backed capacity and unit-economics assessment for 1,000 clients.

Skills

TypeScript

Next.js

Python

FastAPI

PostgreSQL

SQL

Row-level security

Multi-tenant architecture

Security

Observability

Job description

Hammerjack Pty Ltd seeks an accomplished senior software leader to drive the next phase of a multi-tenant B2B SaaS platform. You will define production architecture, ensure secure isolation, and oversee end-to-end client workflows, while guiding AI coding agents and maintaining high observability and robust disaster-recovery plans.

The role emphasizes shipping, production ownership, and cost controls across a scalable, secure stack featuring TypeScript, Next.js, Python, FastAPI, and PostgreSQL.