Freelance Kotlin Multiplatform Developer Jobs in Washington

Quidient is a deep tech AI company pioneering advancements in Generalized (5D) Scene Reconstruction (GSR). GSR is poised to become one of the world's great digital product categories (think GPS, MRI, and LMM). Our flagship GSR product, Quidient Reality®, is a powerful API that enables anyone with a mobile device to virtualize, visualize, and measure anything. Words relevant to Quidient include Generative AI, Physics-Informed AI, Large Scene Models (LSMs), Large World Models (LWMs), and API-First.
Overview
We're seeking an iOS Engineer with deep expertise in mobile 3D applications and spatial computing. You will own end-to-end delivery of major iOS features, driving our product from development to production-ready solutions. This role demands mastery of iOS development, the ability to cut through ambiguity, and ownership of complex systems in a fast-moving environment.
This is a hybrid position, meaning that you will need to live within easy driving distance to our Technology Center in Columbia, Maryland.
What You'll Do
Feature Development & Architecture

• Own end-to-end delivery of major iOS features, taking Quidient's 5D product and SDK from prototype to production with a focus on reliability and performance.
• Architect and design new capabilities within existing iOS codebases, establishing patterns that scale as our product line grows.
• Drive technical decisions on how Quidient builds SDKs and apps from internal frameworks, developing long term sustainable solutions that mature over time.
• Build and optimize 5D mobile applications leveraging ARKit, RealityKit, Metal, and GPU acceleration for high-performance, low-latency experiences.
• Collaborate cross functionally with SDET, Algorithm, and Infrastructure teams to harden features for production and integrate CI/CD pipelines.
• Design and implement RESTful APIs and integrate with server side technologies to support mobile backend communication.
• Assemble complex solutions from loosely defined requirements, navigating ambiguity.
• Mentor and influence technical direction across the iOS team as the product scales.

What You Bring
Must-Have Qualifications:

• Bachelor's degree or higher in Computer Science or related engineering field.
• 7+ years of industry experience in iOS development; freelance acceptable but must include experience with large, complex codebases (not simple sandbox or siloed apps).
• 3+ years of experience building 3D applications or working with spatial computing technologies.
• Deep expertise in iPhone app development using Swift, with recent hands-on iOS.
• Heavy iOS framework experience including ARKit, AVFoundation, Core Location, Core Motion, VisionKit, RealityKit, ImageIO, and CoreML.
• Experience developing web based applications using modern front end technologies and server-side technologies.
• Strong experience in RESTful API design and development.
• Experience in coding languages such as C++ and Python.
• Demonstrated ability to assemble complex solutions from loosely defined requirements without clear PRDs or design documentation.
• Ownership mindset with ability to drive initiatives on a small team with minimal oversight.
• Live within easy commuting distance of our Technology Center in Columbia, Maryland.
• This position is not eligible for H-1B sponsorship.
• Meet Quidient, customer, and government security requirements, which may include, but are not limited to a background check, citizenship verification, and Criminal Justice Information Services verification.

Nice-to-Have Qualifications:

• Experience deploying high-performance, low-latency applications.
• Experience creating computer vision or image processing applications.
• Metal and GPU programming experience.
• Knowledge of Android app development (Kotlin) or cross-platform frameworks (Flutter).
• Knowledge of cloud products and platforms, microservice architectures, automation, and API integration.

What We Offer
Compensation:

• Salary Range: $165,000 - $200,000.
• Annual bonus and equity as appropriate.

Benefits:

• Health insurance
• HSA Account
• 401(k) with company match
• Life & disability insurance
• Paid holidays & generous PTO
• Opportunities for bonuses, equity, and career growth

Equal Opportunity Employer Statement
Quidient is an Equal Opportunity Employer. Quidient will consider all qualified applicants without regard to race, color, religion, creed, sex, sexual orientation, gender identity, marital status, national origin, age, veteran status, disability, or any other classification protected by applicable state, federal, or local laws.