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Family 01

Backend & Frontend Engineering

You build the server and client building blocks of demanding platforms: ERP and trade workflows, identity management, per-entity isolated databases, secure desktop clients. Production code, negative tests, typed API contracts.

Role framework

Roles in this family

Back End Engineer – ERP & Trade

Go/SQL state machines for invoices, orders and selling, with API gates that reject until a condition is met.

SeniorGoSQLState machinesTyped APIs

Back End Engineer – Identity & Access Management (IAM)

Running an on-premises identity provider: OIDC, claims, NFC/USB WebAuthn, device binding, session revoke and freeze.

SeniorOIDCKeycloak / AuthentikWebAuthn / FIDO2Go

Back End Engineer – Data Isolation & DBA

PostgreSQL environments isolated per legal entity and automated provisioning; tests proving cross-entity access fails.

ExpertPostgreSQLGoProvisioningLeast privilege

Bitcoin Custody Engineer

Digital-asset custody: multisig wallets, offline signing (PSBT), spending policies and recovery procedures.

SeniorBitcoinMultisigPSBTHSM

Tauri Lead Engineer – Desktop Client

Technical lead of the Tauri desktop client (Rust + WebView): security policy, signed updates, parity with the mobile client.

ExpertTauriRustTypeScriptSigned updates

Enterprise Architect

End-to-end architecture of an on-premises multi-entity platform: service boundaries, data isolation, identity, flows and recorded architecture decisions.

ExpertArchitectureADRMulti-entityOn-premises

Machine Learning Engineer – On-Premise LLM Agents

Constrained on-premises LLM agents for accounting assistance and financial-document review: per-entity RAG, tools behind typed APIs, evaluations.

SeniorPythonRAGllama.cpp / vLLMEvals

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