Senior Staff Engineer – Payments, Commerce Platform
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Job Description
Principal engineer architecting HighLevel’s global payments and commerce platform. Designing resilient, auditable systems that power transactions for millions of SMBs.
Responsibilities:
- Architect and ship multi-tenant, planet-scale commerce services for checkout, subscriptions, payment orchestration, invoicing, and tax hooks
- Own domain modeling, API and schema design, protobuf/ConnectRPC conventions, versioning, deprecation, and breaking-change checks
- Design resilience and availability mechanisms for payment paths, including retries, circuit breakers, idempotency, outbox/Saga patterns, and graceful degradation
- Ensure auditability through double-entry ledgers, immutable event streams, trace-linked entities, tamper-evident trails, and reconciliation
- Design end-to-end error boundaries, compensations, backfills, and automated replay
- Maintain service catalogs and scorecards covering ownership, SLOs, runbooks, PDBs, autoscaling, budgets, quotas, and timeouts
- Establish configuration and limits across GKE, Pub/Sub, Redis, Firestore/MongoDB, ClickHouse, and GCP
- Build observability with OpenTelemetry, RED/USE metrics, exemplars, trace sampling, SLO dashboards, and actionable alerting
- Lead production excellence through canary/blue-green rollouts, automated rollbacks, chaos drills, disaster-recovery playbooks, multi-region failover, and incident command
- Embed security and compliance controls, including PCI scope minimization, tokenization, KMS hygiene, retention, archival, and privacy controls
- Create developer golden paths, service templates, ADR/RFC processes, contract tests, ephemeral environments, and performance harnesses
- Lead core domain evolution, reliability strategy, API/data governance, design reviews, postmortems, technical strategy, coding standards, mentorship, hiring, onboarding, cross-functional partnership, risk management, and build-vs-buy decisions
Requirements:
- 10+ years building and operating backend systems
- At least 5+ years in Go
- 2–3+ years acting as a Staff/Principal-level individual contributor or Tech Lead for critical paths
- Deep proficiency with protobuf, ConnectRPC/gRPC, and API lifecycle management, including versioning, compatibility, contract testing, and Buf
- Distributed systems fundamentals, including idempotency, deduplication/outbox, ordering, consensus basics, backpressure, and concurrency control
- Event-driven architectures on GCP Pub/Sub and Redis for fast paths
- Strong schema design in MongoDB/Firestore and analytics/reporting patterns on ClickHouse
- Kubernetes/GKE operations at scale, including HPA/VPA, PDBs, resource limits/requests, multi-region topologies, CI/CD, and canary/blue-green deployments
- Reliability engineering experience with SLIs/SLOs, error budgets, capacity and load testing, incident management, and DR/BCP
- Security and compliance knowledge, including secrets/KMS best practices, PCI basics, key rotation, data retention, and archival
- Testing experience across unit, integration, contract, property-based, and performance testing
- Solid understanding of Vue.js and TanStack Query
- Exceptional technical writing and communication
- Experience with major PSPs/local rails, active-active or multi-region designs, chaos engineering, OpenTelemetry, FinOps, PCI DSS, SOC 2/ISO 27001, or relevant privacy laws is nice to have
Benefits:
- Global, remote-first organization
- Opportunity to influence systems supporting millions of businesses worldwide
- Mentorship and ongoing learning opportunities, including brown bags, reviews, and pair design
- Global team collaboration
- Employee India commitment
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