Senior Principal Software Engineer

Staff/Senior/Principal Software Engineer (Elixir/AI Focus) Location: Remote (with occasional travel) Base Location: Salt Lake City, UT, US Employment Type: Full-time Salary Range: $150K - $260K (Based on YOE; potential flexibility for more tenured candidates) We are a rapidly growing, well-funded technology company trusted by enterprise clients, developing a leading AI-powered platform for a specialized professional sector. Join our small, highly efficient engineering team to take ownership of complex systems and ship features quickly in a high-velocity, modern tech stack environment. We are looking for a Staff, Senior, or Principal Software Engineer with a strong background in software engineering leadership to drive the design, implementation, and reliability of our core product. You will take full ownership of features from concept to production in a distributed, modern stack. What You’ll Do: Ship features rapidly within an Elixir/Phoenix/LiveView monolithic application, taking full accountability for the entire feature lifecycle, from design through deployment. Build and maintain numerous third-party integrations (currently 30+) using consistent adapter patterns and the Tesla/Finch client stack. Work within and enhance a distributed Elixir environment (libcluster on Kubernetes) to ensure exceptional scalability, reliability, and performance. Contribute to system quality by utilizing LiveView tests, Hammox for contract testing, and Wallaby for end-to-end user flows. Utilize advanced observability tools (GCP logging, AppSignal, Prometheus, Grafana) to debug complex systems and continuously improve performance. Engage directly with cutting-edge LLM-powered features , including prompt routing, caching, JSON mode, function calling, embeddings ( pgvector ), and evaluation frameworks. Collaborate on a fully defined, version-controlled infrastructure where all components are managed by Terraform within a GCP/GKE environment. Embrace an author ownership culture: write, test, ship, and be responsible for the reliability of your code in production. Experience: 5+ years of experience in a software engineering leadership role (Staff, Senior, Principal, or equivalent). Core Proficiency: Strong, practical experience with the Elixir, Phoenix, and LiveView framework. Distributed Systems: Experience designing and debugging distributed applications running on platforms like Kubernetes (GKE) . Testing/Quality: Proven ability to implement comprehensive testing strategies, including LiveView tests and E2E testing. Infrastructure as Code (IaC): Direct experience with Terraform for managing cloud and application infrastructure. AI/LLMs (Preferred): Familiarity or experience with developing robust systems that utilize LLMs (e.g., prompt engineering, caching, function calling, or vector databases like pgvector). Ownership: A demonstrated history of taking features from end-to-end, including high commitment to production reliability and performance monitoring. Work Style: Thrives in a high-velocity culture with daily small feature/bug fix deployments and multi-day, rather than multi-week, feature cycles. Highly competitive salary package ($150K - $260K) based on experience. Meaningful early-stage equity (0.066% - 0.1%). Fully Remote work arrangement, offering flexibility (occasional travel for team collaboration is encouraged). Work with a modern and highly efficient tech stack including Elixir, Phoenix, LiveView, Rust/Rustler, and Terraform/GCP/GKE . The opportunity to build industry-leading AI tools that automate mission-critical tasks for enterprises. Due to the high volume of applications we anticipate, we regret that we are unable to provide individual feedback to all candidates.If you do not hear back from us within 4 weeks of your application, please assume that you have not been successful on this occasion. We genuinely appreciate your interest and wish you the best in your job search. Commitment to Equality and Accessibility: At MLabs, we are committed to offer equal opportunities to all candidates. We ensure no discrimination, accessible job adverts, and providing information in accessible formats. Our goal is to foster a diverse, inclusive workplace with equal opportunities for all. If you need any reasonable adjustments during any part of the hiring process or you would like to see the job-advert in an accessible format please let us know at the earliest opportunity by View email address on click.appcast.io. MLabs Ltd collects and processes the personal information you provide such as your contact details, work history, resume, and other relevant data for recruitment purposes only. This information is managed securely in accordance with MLabs Ltd’s Privacy Policy and Information Security Policy, and in compliance with applicable data protection laws. Your data may be shared only with clients and trusted partners where necessary for recruitment purposes. You may request the deletion of your data or withdraw your consent at any time by contacting View email address on click.appcast.io.