Senior AI/LLM Software Engineer (Remote)

FIOR Group; United Kingdom; On-site; GBP 90,000 - 140,000; Full time

Job summary

FIOR.Group Limited builds the trust infrastructure for the AI age. We are hiring a senior software developer to design and ship secure features across frontend, backend, core Rust services, and the AI inference layer.

This hands-on role works with the CTO in a small team, focusing on product development, code quality, and solving complex technical problems in a fully remote setup with periodic in-person meet-ups.

Qualifications

• Hands-on AI/LLM development integrating LLMs into production software.
• OpenAI-compatible APIs and evaluation of tool-using workflows.
• Reactive, data-intensive services with SQL, schema design, migrations and RLS.
• Non-trivial asynchronous Rust services using axum and tokio.
• 6+ years building production React/TypeScript web apps with strong UI architecture.
• Security-focused, multi-tenant SaaS with RBAC, OAuth, JWT and TLS/mTLS.

Responsibilities

• Design and integrate AI capabilities using hosted and self-hosted models, including Llama-family models served through vLLM, alongside commercial APIs such as OpenAI and Gemini.
• Build robust backend services and Supabase Edge Functions for AI-assisted investigation, traffic inspection, certificate signing, license binding, and other security workflows.
• Develop well-structured APIs, domain models, and application services that connect the control plane, customer portals, AI services, and the high-performance gateway agent.
• Maintain and extend the fior-agent Rust codebase, including the policy engine, certificate validation, license enforcement, event recording, and integrations with the wider platform.
• Build user-facing features across the React/TypeScript frontend and Supabase backend, including Postgres, row-level security, edge functions, realtime subscriptions, and storage.
• Improve software quality through thoughtful architecture, code review, automated testing, performance profiling, secure coding practices, and pragmatic technical documentation.
• Collaborate with product, security, and customer-facing colleagues to turn complex requirements into reliable, maintainable software and support technical demonstrations when needed.

Skills

AI/LLM integration

Local model serving

Backend API design

Core and systems Rust

Frontend React/TypeScript

Security & multi-tenant SaaS

Communication & independence

Tools

axum

tokio

Deno

Supabase

PostgreSQL

Job description

FIOR.Group Limited builds the trust infrastructure for the AI age. We are hiring a senior software developer to design and ship secure features across frontend, backend, core Rust services, and the AI inference layer.

This hands-on role works with the CTO in a small team, focusing on product development, code quality, and solving complex technical problems in a fully remote setup with periodic in-person meet-ups.