AI / Flutter Developer

Meet Sirocco! We are a provider of unique IT solutions (business systems, mobile and web applications) and we are currently looking for an AI / Flutter Developer.

Join #TeamSirocco and have a real impact on the company’s growth!

AI / Flutter Developer

Work location: Remote / Gliwice

Project:

We are seeking a high-caliber Senior/Lead Software Engineer to lead the development of our privacy-first, cross-platform AI Assistant. You will be responsible for building an architecture where all plaintext and training data remain strictly on-device, utilizing local runtimes (MLX, llama.cpp) and end-to-end encryption (E2EE). This role requires a rare blend of Flutter expertise, native systems programming, and applied cryptography. 

Key Responsibilities

·       Local AI Integration: Implement and optimize local AI runtimes including llama.cpp (GGUF), MLX for Apple Silicon, and WebGPU/WASM for browsers.

·       Encrypted Indexing Pipeline: Build a high-performance, on-device indexing engine featuring text extraction (PDF/DOCX/OCR), chunking, and hybrid search (BM25 lexical + HNSW/IVF vector embeddings) .

·       Privacy & Cryptography: Develop the "SafeShare" capsule engine and verifiable execution receipts using Ed25519/ECDSA signatures and AES-GCM 256 encryption.

·       Native Systems & FFI: Create native plugins and FFI (Foreign Function Interface) layers to interface Flutter with OS-level secure storage like Keychain, Keystore, DPAPI, and TPM.

·       Action Engine Development: Implement "burn-in" PDF/image redaction, DOCX/PDF semantic diff engines, and secure file regeneration .

·       Verifiable Systems: Ensure every assistant execution produces a device-signed JSON receipt (COSE/JOSE) for auditability and transparency.

Technical Requirements

·       Flutter & Dart: Expert-level proficiency in Flutter for cross-platform UI development and native platform channel integration.

·       Local Model Expertise: Hands-on experience with on-device Small Language Models (SLMs) and audio/visual models like Whisper and PaddleOCR.

·       Applied Cryptography: Strong understanding of E2EE boundaries, HKDF key derivation, and hardware-backed key management (Secure Enclave/TPM).

·       Data Structures: Experience with CRDTs or Merkle trees for multi-device shard catalog reconciliation and sync.

·       Performance Optimization: Ability to manage background compute tasks (indexing during idle/charging) and optimize local RAG (Retrieval-Augmented Generation) loops.

·       Very good knowledge of English.

What We Can Offer You:

·       Attractive terms of cooperation, tailored to your skills and experience.

·       Work in an experienced and agile-driven team.

·       An interesting and forward-looking project.

·       A fast and friendly recruitment process.

·       The possibility of remote or hybrid work.

·       Air-conditioned office in Gliwice.

·       A great atmosphere and a close-knit team – integration events, games and competitions, shared sports challenges.

·       Employee benefits package: Luxmed and Multisport packages, Polsat Box Go access.

·       Development opportunities: participation in trainings, conferences, and knowledge sharing.

About Sirocco:We are a trusted IT partner with over 15 years of experience. We specialize in developing business systems, as well as mobile and web software.We handle all aspects of IT projects from A to Z, delivering unique IT solutions to well-known brands around the world.Join #TeamSirocco (120+ people) and discover the Sirocco Way – our perfect blend of good humor, professionalism, and excellent work ethics!

Why Us?

·       We value your opinion

·       We encourage you to succeed

·       We want You to grove and thrive. 

Join #TeamSirocco and make Your mark!