AI Backend Engineer

Description Backend AI Engineer [Freelance, Full-time, Remote] SNEAK PEEK ⇨ Location: Remote, GMT+0/+4 ⇨ Interview process: HR Interview ⇨ Technical interview ⇨ Take-home challenge ⇨ Presentation of home challenge ⇨ Contact: For questions please reach out to: hr@rounds.com WHO ARE WE? At Rounds, we believe in harnessing the power of cutting-edge technology to drive business success. Our transformative, machine-learning technology identifies and optimizes mobile assets, while our team of experts, with their unparalleled human capital and business acumen, provides the strategic direction and support to turn mobile assets into profitable businesses. Together, we are revolutionizing the mobile industry. You can find out more info about us here: www.rounds.com. THE ROLE We’re looking for a strong systems-oriented engineer with hands-on LLM experience to join our AI Innovation team. In this role, you’ll build AI systems and internal products that improve how teams work across different departments and areas in the company. The common denominator is ownership: you should be comfortable leading projects end-to-end, including clarifying needs with stakeholders, making decisions under ambiguity, and pushing through blockers when they arise. This role is a strong fit for someone who enjoys both sides of applied AI work: full-stack engineering and practical use of LLM capabilities. Hiring manager: Ori Nahum, AI Innovation Team Lead (https://www.linkedin.com/in/ori-nahum-b4a254aa/) What you’ll be working on Examples of projects you may work on: AI agents for code generation workflows (especially in mobile applications) A mobile app navigation agent Backend services that orchestrate LLM workflows, tool calling, and integrations with internal systems AI chatbot connected to internal data sources and business systems And other new AI-driven solutions that support different departments across the company You’ll be expected to move between experimentation and implementation: validating ideas quickly, turning the promising ones into reliable tools, and leading projects far enough to make them useful in practice — not just technically possible. Requirements WHAT ARE WE LOOKING FOR? Must-have 5+ years experience in software development (preferably in Python, TypeScript, or mobile development). Ability to lead projects from idea to production, including aligning with stakeholders, driving decisions, and proactively removing blockers when needed Hands-on experience building LLM-based products, tools, or agents beyond toy prototypes Good understanding of prompt design, tool calling, orchestration, and how to make LLM systems actually useful Strong English communication skills Big advantage Experience building internal developer tools or productivity systems Background in mobile development, especially native Android or iOS Design and implement evaluation frameworks to assess AI performance, accuracy, and reliability. Solid understanding of ML theory and how LLMs work under the hood, including key concepts, limitations, and trade-offs beyond the API layer Familiarity with cloud infrastructure / DevOps / CI-CD Good judgment around where AI adds value and where it doesn’t Who will do well here You’ll likely do well in this role if you: Like building practical systems, not just demos Take initiative without waiting for perfect specs Enjoy exploring new tools, but know how to separate hype from what’s actually useful Want the freedom to research, experiment, and then ship Enjoy working across different problem spaces and use cases, rather than staying in one narrow lane INTERESTED? Our recruitment process consists of the following steps: HR interview with the recruitment manager: 45 min Technical interview with the AI Engineer Tech Lead & Team Lead: 1 hour Take-home challenge: ~ 4 hours of work Final Interview - take-home challenge presentation with CTO and AI Engineer Team Lead and Tech Lead: 1 hour Get in touch at hr@rounds.com. We look forward to hearing from you!