Senior Software Engineer

About Us

FIOR.Group Limited builds the trust infrastructure for the AI age. Our flagship product, the FIOR AI Gateway, acts as SSL for AI — giving enterprises certificate-based identity, policy enforcement, and quantum-safe cryptography for autonomous AI agents. The platform pairs a high-performance Rust gateway agent with a multi-tenant control plane and role-specific portals, used by regulated organisations across finance, energy, defence, and aerospace.

The Role

We're hiring a senior software developer to build and evolve the FIOR AI Gateway product end-to-end. Working directly with the CTO in a small, senior team, you'll design and ship secure product features across the frontend, backend, core Rust services, and AI inference layer. This is a hands-on software engineering role focused on product development, code quality, and technical problem-solving.

What You'll Do

• 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.

Required Skills & Experience

• AI/LLM Development: Hands-on experience integrating LLMs into production software, including prompt and context design, structured outputs, tool calling, orchestration, evaluation, and failure handling.
• Local Model Serving: Practical experience with vLLM and Llama-family models, including model selection, OpenAI-compatible serving APIs, inference configuration, performance trade-offs, and production integration.
• Backend Development: Strong experience designing APIs and data-intensive services, with solid SQL, schema design, migrations, row-level security, edge functions (Deno), and Supabase/Postgres.
• Core and Systems Development: Able to read, modify, test, and extend a non-trivial asynchronous Rust service using frameworks such as axum and tokio.
• Frontend Development: 6+ years building production web applications with React and TypeScript, including hooks, context, routing, state management, accessible components, and maintainable UI architecture.
• Software Architecture & Security: Strong understanding of modular design, API contracts, testing, and multi-tenant SaaS. Practical experience with RBAC, OAuth, JWT, X.509, PKI, TLS/mTLS, and modern signing and verification flows.
• Communication: Clear written and verbal communication, sound engineering judgement, and the ability to work independently in a senior, asynchronous, low-overhead product team.

Bonus Points For:

• Retrieval-augmented generation, embeddings, vector search, and agentic or tool-using AI workflows.
• Prompt-injection defences, LLM security, model evaluation, observability, or inference optimisation.
• Post-quantum cryptography or compliance frameworks such as SOC 2, ISO 27001, NIS2, GDPR, or FIPS 140-3.

What We Offer

Direct ownership and visible impact on a category-defining product, at the intersection of AI, cryptography, and security.