Software Engineer-PMTS-Architecture and Design-REST/SOAP WebSvc-Jenkins/Maven-CIO Org

Position: Principal Member of Technical Staff — Slack Voice Agent
Location: Remote - Washington (PST time zone accommodation required)
Duration: 6 Months (Potential for extension or conversion to FTE)
Job ID: 179253

## About the role
You will own the architecture and design of the platform behind Slack's voice agent — a native mobile voice/AI assistant experience inside the Slack mobile ecosystem. This is production work, not prototyping: your services, APIs, and pipelines must meet the bar of Slack's production codebase — modular, tested, linted, accessible, and performant at Slack's scale (tens of millions of users).
Slack is an extremely design-driven organization. Every hire, engineering included, must have demonstrable design sensibility and experience working within (or adjacent to) a mature design system. As the principal engineer on the project, you set the technical standard that our iOS and Android client engineers build against.
## What you'll do

• Own end-to-end architecture and technical design for the voice agent platform: service decomposition, API contracts, data models, failure modes, and latency/capacity budgets for real-time conversational experiences.
• Design, build, and operate the RESTful web services that power the voice agent — voice capture/playback backends, streaming agent responses, session state, and deep integration with Slack's mobile apps — and integrate with (and help modernize) existing SOAP-based enterprise web services in the CIO organization.
• Architect real-time communication layers (WebSockets / streaming APIs) for low-latency voice and agent responses: connection management, backpressure, reconnection, and graceful degradation.
• Define the client–service contracts that iOS and Android engineers implement against; review client integration code for architectural soundness.
• Own CI/CD and build infrastructure: Jenkins pipelines (declarative pipelines, shared libraries), Maven builds and artifact management, quality gates, feature flags, and staged rollouts.
• Lead design reviews and code reviews to Slack's standards; author architecture decision records; mentor senior engineers on the team.
• Collaborate daily with design and product — ensuring voice interaction states (listening / thinking / speaking / error / interruption) are technically realized to spec, not approximately.

• 10+ years of software engineering experience, operating at principal/architect level on large-scale distributed systems — a demonstrated track record of architecture and design ownership, not just implementation.
• Expert-level REST API design (versioning, pagination, error models, idempotency, authN/authZ) *and* working fluency with SOAP/WSDL enterprise web services, including migrating or wrapping SOAP services behind modern REST interfaces.
• Production experience with real-time systems: WebSockets, streaming APIs, low-latency backends; voice/audio streaming experience is a strong plus.
• Deep JVM services background (Java and/or Kotlin) with expert-level *Maven* (multi-module builds, dependency management, plugin configuration) and *Jenkins* (pipeline-as-code, shared libraries, scaling build infrastructure).
• Experience building and operating services consumed by mobile clients — you understand what iOS/Android teams need from an API contract.
• Shipped and maintained systems at 100K+ MAU minimum; 1M+ MAU strongly preferred — with the observability, incident discipline, and phased-release experience that scale demands.
• Rigorous testing culture: unit, integration, and contract testing embedded in CI; Git-based code review culture.
• Design sensibility: experience working within or adjacent to a mature design system at a design-driven company.

• Prior work at a company with a strong, recognized design language — e.g., Apple, Airbnb, Duolingo, Linear, Figma, Notion, Stripe, Cash App/Block, Headspace, Robinhood, Vercel.
• Voice/conversational AI product experience (e.g., OpenAI, , Replika, Siri/Alexa teams): ASR/TTS integration, LLM streaming backends, token-streaming architectures, WebRTC.
• Hands-on familiarity with Swift/iOS or Kotlin/Android — enough to review client-side integration with empathy and precision.
• Experience in enterprise/CIO-organization environments: security, compliance, and governance requirements for internal-facing platforms.
• Accessibility at production depth (voice experiences must be accessible by default).
• Aside from the job description, what will a typical day for this contractor look like? Interfacing with Slack and AI Research team to integrate voice agent into Slack

• Please rank your top preferred skill sets (e.g.: tools, previous experience, technologies) : No particular ordering. Swift / SwiftUI / UIKit / Kotlin / Jetpack / SQLDelight / JUnit

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Pay Range: $90/hr - $95/hr

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