Senior Software Engineer | Tech Lead

Sustainix AI — Founding SWE / Tech Lead

Builder-leader. End-to-end ownership. Amsterdam / EU remote.

sustainix.eu | [email protected]

What We're Building

AI agents for sustainable real estate. Our wedge: BREEAM certification, Europe's leading building standard. We ingest messy documents and turn them into evidence-linked actions, CFO-ready ROI, and credible credit uplift in weeks, not months.

The core technical challenge: buildings live in PDFs, floor plans, photos, and scanned certificates. Our pipeline reads, understands, and extracts structured data from all of it, including image understanding (floor plans, technical drawings, site photos) and standards extraction from dense regulatory documents, then maps findings to BREEAM credits automatically.

Simple flow: document in > AI parses text + images > structured evidence out > credit mapping > ROI/uplift plan > assessor-ready export. Deterministic finance.

The problem: 35M buildings in the EU need renovation by 2030. BREEAM is the language to improve them. TAM: EUR 5B.

Where we are now: about to start pilots. We need to ship, fast.

The Role

Own product engineering end-to-end. Set technical direction, ship PoC to production SaaS, build the first engineering team. Co-founder level with meaningful equity.

First 12 months:

• Ship v1 to production and onboard first 2-3 paying pilots
• Make document ingestion rock-solid across PDFs, images, floor plans, and scanned docs
• Build accuracy infrastructure: gold test sets, dashboards, release gates
• Secure the platform with RBAC, audit trails, GDPR compliance, and enterprise-readiness
• Deliver recurring value through alerts, invoice QA, and CAPEX tracking
• Hire 1-2 engineers and establish a ship-every-week cadence

Tech Stack

AI: Gemini + GPT for document understanding and image reasoning. LlamaIndex for retrieval. External YAML rulebook for BREEAM credit logic, versioned and auditable. No black boxes.

Frontend: Next.js 15, TypeScript strict, ShadCN UI, Tailwind.

Backend: Multi-tenant SaaS, RBAC, audit trails, GCP. Clean separation between AI reasoning and deterministic business logic.

You Have

• Shipped a B2B SaaS from v1 to GA with end-to-end ownership (5+ years)
• Led an AI/LLM-integrated product from prototype to production with evaluation
• Built multi-tenant systems with RBAC, auditability, and real on-call responsibility
• Worked in a small, high-performing founding team as both builder and leader

Nice to have: PropTech or BREEAM familiarity, agentic workflows, retrieval over documents, SSO/OIDC, infra automation, cost discipline.

What You Get

• Co-founder level equity + cash (flexes with funding stage)
• A genuinely important problem: real buildings, real carbon, real regulation
• A senior founding team and advisor network to build alongside
• Amsterdam hub preferred; EU remote considered

The Team

Dragos Avram — CEO. 5+ years sustainability management. BREEAM expert, previous founder.

Alex Mititelu — Founding SWE. Vattenfall AI Analyst. TU Delft MSc AI.

Thomas Hillman-Eady — CPO. 5+ years technical consulting. BREEAM Assessor, LEED, WELL, GPR AP.

Lourdes Calderon — Advisor. Real estate advisor. Sustainability expert in listed real estate.

Apply

[email protected] or DM on LinkedIn: Dragos Avram