[Remote] Senior Staff Prototyping Engineer, iOS

October 12, 2026

Note: The job is a remote job and is open to candidates in USA. Slack is a digital headquarters that brings people, apps, customers, and AI agents together to help teams communicate, collaborate, and get work done. The Senior Staff Prototyping Engineer will lead greenfield iOS initiatives, shaping product and design direction through rapid prototyping and shipping innovative, intuitive, performant, and reliable mobile experiences. The role partners across Product, Design, Backend, and mobile engineering while providing technical leadership, mentorship, and organizational influence.

Responsibilities

Shape the future of Slack on mobile by leading the engineering development of experiences used by millions of users every day, spanning multiple teams and the broader organization
Lead the most complex, ambiguous, cross-functional initiatives from early technical exploration through production rollout and long-term evolution
Lead feature prototyping to define the mobile user experience for Slack’s biggest opportunities
Partner closely with Product and Design to shape experiences that balance user needs, technical constraints, and long-term maintainability
Influence engineering decisions beyond your immediate team through technical leadership, product reviews, and mentorship
Set and evangelize best practices for mobile feature development and operational excellence across the broader engineering organization
Mentor senior engineers and contribute to the growth of the broader mobile engineering community within Slack

Skills

10+ years of professional software engineering experience, including significant experience building complex, high-craft iOS applications at scale
Proven track record of moving outside of organizational boundaries to start new initiatives, prototype the path to production, and reorient the organization to support the new initiative
Experience working in fast-paced environments, whether at a start-up, in an incubator, or on a zero-to-one team inside a larger enterprise
Proven track record of leading large, ambiguous, org-spanning technical initiatives with significant business impact
Deep expertise in Swift framework and modern iOS development
Strong understanding of iOS architecture, application lifecycle, concurrency, networking, and performance optimization
Demonstrated ability to influence product and technical direction through expertise and collaboration, driving alignment across executive stakeholders, Engineering/Product/Design leadership, and multiple teams
A bias toward ownership, execution, and continuous improvement, with the judgment to prioritize the highest-leverage work across the organization
Experience with Combine, Swift Concurrency (async/await, actors), and dependency injection frameworks (e.g. Needle, Resolver)
Experience leading large-scale new products, features, or product transformations spanning multiple teams or the whole org
Experience using research, usability testing, data, and experimentation to ground decisions and uncover opportunities
Contributions to open source projects or the iOS community, or other external recognition of technical leadership
Experience building collaboration, productivity, messaging, AI, or enterprise software products
Excellent communication skills
Strong product intuition and a passion for creating exceptional user experiences

Benefits

Time off programs
Medical insurance
Dental insurance
Vision insurance
Mental health support
Paid parental leave
Life insurance
Disability insurance
401(k)
Employee stock purchasing program
Office Tech-Flexible work arrangement

Company Overview

Slack is a cloud-based communication and collaboration platform for teams. It is a sub-organization of Salesforce. It was founded in 2009, and is headquartered in San Francisco, California, USA, with a workforce of 1001-5000 employees. Its website is

Company H1B Sponsorship

Slack has a track record of offering H1B sponsorships, with 4 in 2022, 72 in 2021, 71 in 2020. Please note that this does not guarantee sponsorship for this specific role.

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