Principal / Staff Platform Architect

KOS International is partnering with a leading global financial technology platform to hire a Principal / Staff Platform Architect for its U.S. engineering team. This role will take ownership of the core architecture behind a large-scale financial cloud platform, supporting 2,000+ microservices across multiple global, compliance-regulated environments . You will lead the transformation towards a modular, scalable and highly reliable platform, with a particular focus on version management, dependency analysis, build systems and compatibility engineering . This is a high-impact opportunity to shape the architecture of a global financial technology platform, working closely with senior engineering leadership and the CTO. Key Responsibilities Design the version set model: each site defined as a locked, tested combination of module versions (analogous to a Bazel workspace snapshot or Cargo.lock), with version compatibility matrices and automatic constraint solving Architect reproducible build pipelines: any module at any version produces byte-identical artifacts regardless of when/where it's built; hermetic build environments, content-addressable artifact storage, SLSA Level 3+ provenance Build and maintain the live dependency graph spanning 2000+ services: static analysis (code/API/schema) + runtime analysis (traffic-weighted call patterns), transitive dependency resolution with automatic conflict detection Design the monorepo + package ownership governance model: clear module boundaries via DDD, CODEOWNERS enforcement, cross-module change protocols, module boundary enforcement tooling (lint rules, CI checks, architectural fitness functions) Architect change impact analysis systems: given any PR, compute which modules/sites/tests are affected; selective test execution (run only dependency-graph-proven relevant tests); change confidence scoring (blast radius + coverage + stability risk grade) Design the GitOps-driven multi-site deployment model: site config repos declaring module versions + compliance parameters, automated deployment strategies (patch auto-deploy, minor with review, major with migration plan, security force-push) Architect the four-layer testing framework: Module self-test Platform compliance tests (parameterized by country) Cross-module integration tests Site-specific tests, with automated coverage enforcement that blocks deployments when gaps are detected Major Requirements 10+ years in large-scale distributed systems / platform infrastructure Deep expertise in build systems and dependency management at scale: Bazel, Buck, Pants, Nx, or equivalent (1000+ packages) Production experience with reproducible build engineering: content-addressable storage, hermetic builds, deterministic CI, artifact provenance (SLSA) Experience building dependency graph tooling: static/runtime dependency analysis, impact computation, selective testing Strong background in semantic versioning governance across large service fleets: version resolution, compatibility constraints, lockfile-style pinning Experience with API contract evolution: protobuf/gRPC versioning, schema evolution strategies, contract testing Experience with multi-region/multi-tenant platform architectures serving regulated workloads Track record of migrating monolithic systems to modular architectures without business disruption Preferred: Experience with Amazon's internal VersionSet / Brazil build system / Apollo deployment, or similar systems at Google (Blaze/Bazel), Meta (Buck/Configerator) Preferred: Background at Stripe or Adyen — multi-country financial platform with compliance parameterization Preferred: Mandarin proficiency for collaboration with Singapore/APAC engineering teams #J-18808-Ljbffr KOS International Talent Group