SISA Information Security - Senior/Principal Architect - Endpoint Detection & Response

About The Role

We build a distributed, agent-based endpoint security platform for the payment ecosystem, combining an endpoint agent (a core runtime plus pluggable security modules, built entirely in Go), an on-premise management component deployed at the customer site, a local telemetry relay component, and a cloud backend.

Kernel-level components that hook into the OS are written in C/C++, as is standard for driver-level development.

We're looking for a Senior/Principal Architect to own end-to-end architecture across this stack from the control-plane protocol on the endpoint, through on-premise components, to secure egress into the cloud backend.

This is a hands-on architecture role: you will be expected to review code and low-level design, not just produce diagrams.

Key Responsibilities

Define the architecture for kernel-level components on the endpoint (drivers/kernel modules used for real-time monitoring, hooking, or enforcement), including their interaction with and isolation from the user-mode agent runtime and its modules.
Own architectural decisions across the full platform: the endpoint agent (core runtime + pluggable security modules), the on-premise management component, the on-premise telemetry relay component, and the cloud backend.
Define and evolve the control-plane (gRPC/Protobuf) and data-plane transport strategy between the endpoint agent, the on-premise management component, and the telemetry relay component.
Own version compatibility strategy across independently-versioned components (agent, core runtime, modules, management component, cloud backend).
Design secure, outbound-only, multi-tenant deployment topology mTLS and certificate lifecycle management, IPSec/VPN egress design suitable for PCI-regulated payment industry clients.
Own the client-facing security architecture narrative: per-hop network/port/protocol documentation, PCI-DSS scoping discussions, and direct engagement with client InfoSec/audit teams.
Architect the security-module lifecycle: subscription entitlement enforcement, binary distribution, staged/canary rollout and rollback, resource governance across concurrently running modules, and failure isolation so a single module cannot take down the core agent runtime.
Define HA/DR strategy for on-premise components deployed inside customer environments that are not directly operated by us.
Evaluate and decide on the design of any bi-directional channel between the cloud backend and on-premise components, ensuring it doesn't undermine the outbound-only security posture documented to clients.
Run architecture reviews, mentor senior and mid-level engineers, and own technical roadmap and tech-debt prioritization.
Represent the company in high-stakes architecture and security review calls with enterprise client stakeholders.

Required Technical Skills

1520+ years in software engineering, including 8+ years in architecture or senior technical leadership roles.
Deep expertise in distributed systems design; direct experience with agent-based security products (EDR/XDR, endpoint protection, DLP, or similar) is strongly preferred.
Strong hands-on background in Go the agent runtime and its modules are built entirely in Go plus working proficiency in C/C++ for reviewing and guiding kernel-level driver work.
Able to review code and low-level design in depth, not just at a diagram level.
Solid understanding of kernel-level/OS-internals development (e.g., Windows kernel drivers/minifilters, Linux kernel modules/eBPF) sufficient to architect and review how endpoint agents hook into the OS for real-time monitoring or enforcement, and to reason about the security and stability risks that come with it.
Expert-level knowledge of gRPC, Protocol Buffers, and HTTP/2, including streaming and multiplexing trade-offs at scale.
Strong grasp of mTLS/PKI design: certificate issuance, rotation, and revocation for large, distributed fleets.
Solid understanding of network security fundamentals: IPSec/VPN tunnel design, NAT/firewall traversal, and outbound-only architecture patterns for customer-premise deployments.
Experience architecting multi-tenant SaaS products with components deployed partially on customer premises, not just in a vendor-controlled cloud.
Working knowledge of PCI-DSS (or equivalent frameworks such as ISO 27001/SOC 2) and their direct implications on network and data-flow architecture.

Preferred / Nice To Have

Prior architecture role at a cybersecurity product company (EDR, XDR, SIEM, DLP, or breach-and-attack simulation).
Direct exposure to active security-testing or breach-and-attack simulation style products.
Cloud infrastructure experience (AWS/Azure/GCP) for the backend/cloud side of the platform.
Track record presenting architecture directly to enterprise client security/audit teams.

What Success Looks Like In This Role

A documented, defensible security architecture narrative that survives client InfoSec audits without surprises.
A version compatibility and module-lifecycle strategy that prevents fleet-wide breakage from a single bad rollout.
A mentored engineering team capable of making sound architectural trade-offs Bachelor's or Master's degree in Computer Science, Engineering, or a related field.
Equivalent hands-on experience will be given full weight over formal qualifications.

(ref:hirist.tech)
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