Senior API & Integration Engineer

Winixx Inc.; Atlanta (GA); Hybrid; USD 125,000 - 180,000; Full time

Benefits offered by this job

Visa sponsorship

Paid time off

Company holidays

Professional development

Job summary

Winixx Inc. in Atlanta is seeking a Senior API & Integration Engineer to design and build the Winixx SDK—the core API surface and device-class extensions that third‑party developers will rely on.

You will ensure AOSP compatibility across our custom fork while exposing stable, well‑documented APIs across smartphones, wearables, POS devices, and gaming consoles. Ideal candidates have 5+ years building SDKs or APIs with Android framework experience, strong API design instincts, and a background in

Qualifications

• 5+ years of experience building platform SDKs or APIs, with direct AOSP or Android framework experience.
• Deep understanding of Android API design, versioning, and backward-compatibility practices.
• Experience building APIs for diverse hardware/device classes (mobile, embedded, wearable, or POS).
• Familiarity with designing for OS‑update resilience without requiring app rebuilds.
• Strong documentation and API design instincts.

Responsibilities

• Design and build the core Winixx SDK API surface, plus device-class extensions (POS payment APIs, console input APIs, wearable sensor APIs).
• Ensure standard Android API compatibility across the custom AOSP fork.
• Define versioning and stability guarantees for the SDK and OS‑update resilience for third‑party apps.
• Build and maintain the simulator's API‑level fidelity to real on‑device behavior.
• Collaborate with the UI team to expose declarative layout and adaptive UI APIs.
• Work with Security to review new API surfaces for security implications.
• Author SDK documentation and best‑practice guides for third‑party developers.
• Support developer relations by triaging SDK feedback from early access partners.

Skills

SDK design

AOSP/Android

API versioning

Cross-hardware APIs

Documentation

Education

Bachelor's degree in CS or equivalent

Tools

Android Studio

Android SDK

Job description

API & Integration

Senior API & Integration Engineer

Atlanta, GA, US Hybrid Full-time $125,000 – $180,000

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 now building WinixxOS — a distinctive, AOSP-based operating system powering a full lineup of consumer hardware including phones, tablets, smartwatches, POS devices, and gaming consoles. Founded with a mission to modernize fragmented and underserved industries, Winixx builds technology that removes inefficiencies, creates transparency, and puts more value in the hands of the people doing the actual work. This is early-stage, high-ownership platform engineering — you would be shaping foundational decisions for a new OS, not implementing someone else's spec.

Role Summary

The Senior API & Integration Engineer designs and builds the Winixx SDK — the core API surface plus device-class extensions that third-party developers will build against. You will ensure AOSP compatibility holds up across our custom fork while exposing stable, well-documented APIs across our entire hardware lineup.

What You’ll Do

• Design and build the core Winixx SDK API surface, plus device-class extensions (POS payment APIs, console input APIs, wearable sensor APIs)
• Ensure standard Android API compatibility is preserved where intended across the custom AOSP fork
• Define versioning and stability guarantees for the SDK, including OS‑update resilience for third‑party apps
• Build and maintain the simulator's API‑level fidelity to real on‑device behavior
• Collaborate with the UI team to expose declarative layout and adaptive UI APIs
• Work with the Security team to ensure new API surfaces are reviewed for security implications
• Author SDK documentation and best‑practice guides for third‑party developers
• Support the developer relations effort by triaging SDK feedback from early access partners

What We’re Looking For

• 5+ years of experience building platform SDKs or APIs, with direct AOSP or Android framework experience
• Deep understanding of Android API design, versioning, and backward‑compatibility practices
• Experience building APIs for diverse hardware/device classes (mobile, embedded, wearable, or POS)
• Familiarity with designing for OS‑update resilience without requiring app rebuilds
• Strong documentation and API design instincts — you think like an SDK consumer
• Comfortable working in an early‑stage environment defining the API surface from scratch
• 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
• Front‑row seat at a company building a new OS and hardware ecosystem from the ground up
• 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. 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.