Senior Runtime Engineer (ARC)

Winixx; Atlanta (GA); On-site; USD 145,000 - 210,000; Full time

Benefits offered by this job

Visa sponsorship

Performance bonus program

Paid time off

Company holidays

Professional development support

Job summary

Winixx in Atlanta, GA is seeking a Senior Runtime Engineer to help shape a new language runtime and its ARC memory model for high-performance targets. The role focuses on deterministic memory management, low latency, and cross-language interop with Kotlin/Java in an AOSP-like environment.

You will design the ARC runtime, optimize retain/release paths, and collaborate with the Compiler Frontend to ensure ownership rules are correctly enforced.

Qualifications

• 5+ years in systems or runtime engineering.
• Bachelor's degree in CS or equivalent.
• Willingness to work in a hybrid Atlanta office with visa sponsorship.
• Experience with ARC, GC, or memory-management runtimes.

Responsibilities

• Design and implement the ARC memory management runtime for .wnx.
• Optimize retain/release performance for latency-sensitive device classes (console, POS).
• Build the interop bridge between .wnx's object model and existing Kotlin/Java AOSP APIs.
• Handle reference-cycle detection and mitigation strategy.
• Collaborate with the Compiler Frontend team to ensure the type system correctly enforces ownership rules.
• Profile and optimize runtime performance across all targeted device classes.
• Document runtime behavior for the standard library and tooling teams.

Skills

ARC memory management

Performance profiling

Systems/runtime engineering

Interoperability (Kotlin/Java)

Education

Bachelor's degree in Computer Science

Tools

Interoperability with native/JVM models

AOSP APIs

C/C++ interop

Job description

Atlanta, GA, US Hybrid Full-time $145,000 – $210,000

About Winixx

Winixx Inc. is a New York-based technology holding company operating a portfolio of over 35 SaaS platforms across freight, fleet management, financial infrastructure, and market intelligence. We are building WinixxOS — a distinctive, AOSP-based operating system powering a full lineup of consumer hardware — and, over a multi-year horizon, .wnx, a proprietary programming language designed to be announced alongside WinixxOS. This is founding-team language engineering: you would be shaping the core type system, memory model, and syntax of a new language from its very first version, not extending someone else's spec.

Role Summary

The Senior Runtime Engineer builds .wnx's Automatic Reference Counting (ARC) memory model and runtime — the deterministic, low-latency memory management system that underpins performance-sensitive targets like console and POS.

What You’ll Do

• Design and implement the ARC memory management runtime for .wnx
• Optimize retain/release performance for latency-sensitive device classes (console, POS)
• Build the interop bridge between .wnx's object model and existing Kotlin/Java AOSP APIs
• Handle reference-cycle detection and mitigation strategy
• Collaborate with the Compiler Frontend team to ensure the type system correctly enforces ownership rules
• Profile and optimize runtime performance across all targeted device classes
• Document runtime behavior for the standard library and tooling teams

What We’re Looking For

• 5+ years of systems or runtime engineering experience, ideally with direct ARC, garbage collector, or memory-management runtime experience
• Deep understanding of memory management tradeoffs (ARC vs. GC vs. ownership models)
• Experience with low-level interop between managed and native/JVM-style object models
• Strong performance profiling and optimization skills
• Comfortable working on foundational, multi-year language infrastructure
• Bachelor's degree in Computer Science or equivalent experience

• Competitive base salary commensurate with experience
• Performance bonus program tied to individual and company milestones
• Visa sponsorship available for the right talent
• Full-time role with a minimum one-year commitment
• A rare opportunity to help design and build a production programming language from scratch
• Collaborative, mission-driven team environment
• Paid time off and company holidays
• Professional development and continuing education support

Winixx Inc. is an equal opportunity employer. We evaluate all applicants on the basis of qualifications, experience, and demonstrated ability without regard to race, color, religion, sex, national origin, disability, veteran status, or any other characteristic protected by applicable law.

This is a full-time position with a minimum one-year commitment, on a multi-year (5-year horizon) language development effort. Visa sponsorship is available for candidates with the right qualifications and experience.

The compensation range reflected in this posting represents the minimum and maximum target range for this position. Individual pay within the posted range is determined by a candidate's demonstrated experience, educational background, skill set, and geographic location. Final compensation is established at the time of offer and may fall anywhere within the stated range based on these factors.

Compensation ranges reflect national US market data and are subject to change. Additional forms of compensation may include performance bonuses, equity participation, and other benefits as outlined in your offer documentation.