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Lead Engineer — Computer Vision & LLM Systems London (hybrid/in-office preferred) | Full-time** ## The company We are an AI-powered property intelligence platform. We turn a Rightmove or Zoopla listing into a full development appraisal — GDV, build costs, planning probability, extendable envelope — derived directly from floor plan geometry and plot data. Our browser extension and AI assistant, Otto, put this in front of UK estate agents at the point of instruction; a consumer-facing product is in build. We are mid-pilot with Glue Dog, a major UK independent estate agent network. If you need process, roadmap certainty, or a large team around you before you can ship, this isn't the role. ## The role You will own two things end to end: the computer vision pipeline that turns raw floor plans and plot data into structured geometry, and the LLM/RAG architecture behind Otto. You will also carry production ownership — you are the person who gets paged when the appraisal engine returns a wrong number to a paying agent mid-pilot, and the person who designs the system so that happens as rarely as possible. You will report directly to the founder and work alongside two engineers (frontend/backend generalists) whom you will technically lead on anything touching CV or LLM infrastructure. ### What you'll actually be doing in month one - Auditing and hardening the current floor-plan-to-geometry pipeline: room boundary extraction, wall/door/window detection, area computation from scanned and vector inputs. - Closing a live architectural vulnerability in Otto's consumer tier — full appraisal data is currently passed into LLM context with only prompt-level suppression; this needs to become an architectural (not prompt-level) guarantee before consumer launch. - Reviewing and rebuilding as needed the retrieval-and-narrate architecture: locked JSON tool calls against a deterministic calculation engine, with the LLM producing zero independent arithmetic. - Fixing data pipeline fragility — e.g. postcode-passing failures that silently fall back to national averages instead of failing loudly. ### Ongoing - Extend the CV thesis: deriving extendable development envelope from floor plan geometry plus plot constraints (permitted development rules, setbacks, massing) — this is the core differentiated IP of the product, and largely still needs to be built out, not just maintained. - Own uptime, monitoring, and incident response for the calculation engine and Otto during the Glue Dog pilot and beyond. You build the observability stack; you also carry the pager until we can hire under you. - Design and enforce output constraints on the LLM layer consistent with FCA/FSMA compliance requirements (no ROI%/yield/annualised-return framing, RICS development-appraisal terminology only) — the compliance logic is defined; you own making it structurally unbreakable rather than instruction-dependent. - Mentor and technically direct the two existing engineers on infrastructure and ML-adjacent work. ## Requirements **Computer vision** - Production experience with object detection/segmentation (YOLO, Detectron2, Mask R-CNN, or transformer-based segmentation) applied to structured/technical imagery — floor plans, CAD, architectural drawings, or comparable (satellite/aerial, medical, industrial). - Geometric reasoning on top of CV output: polygon extraction, area computation, constraint-based spatial reasoning. - Experience with OCR on low-quality scanned/PDF inputs, and building pipelines that degrade gracefully rather than silently producing wrong answers. **LLM/RAG** - Production experience building tool-calling LLM architectures with hard output constraints — not prototype chatbots. You should already understand why prompt-level suppression is not a security boundary. - RAG pipeline experience: embeddings, vector DB (ChromaDB, Pinecone, Weaviate, or equivalent), retrieval tuning. - Comfort building schema-enforced, denylist-constrained generation for a regulated domain. **Otto-specific** - Context isolation between subscription tiers within a single LLM session — the candidate must be able to explain, unprompted, why passing full paid-tier data into a shared context window and relying on prompt instructions to withhold it from free-tier users is an architectural failure, not a prompt-engineering problem, and must have implemented tenant/permission-scoped retrieval before (row-level security, scoped embeddings, or separate context construction per access tier) rather than a single retrieval call filtered after the fact. - Structured output enforcement against a fixed schema (JSON schema validation, function-calling with strict argument typing, or grammar-constrained decoding) sufficient to guarantee Otto cannot emit a number it did not receive from the deterministic calculation engine — this is a harder constraint than typical RAG citation-grounding and the candidate should have shipped systems where a malformed or out-of-schema model response is rejected and retried rather than passed to the user. - Adversarial testing / red-teaming of LLM outputs specifically for regulatory leakage — designing test suites that attempt to get the model to produce ROI%, yield, annualised return, or other FSMA s.21-exposed language despite denylist and system-prompt controls, and iterating the architecture (not just the prompt) until those attempts fail. - Experience building or maintaining a denylist/allowlist enforcement layer that sits outside the model call (post-generation validation, not just pre-generation instruction) so that compliance failures are caught even when the model doesn't follow instructions. - Familiarity with retrieval-and-narrate patterns specifically — i.e., has built systems where the LLM's only job is to fetch a pre-computed answer and phrase it, with zero tolerance for the model performing its own arithmetic, unit conversion, or inference on numeric fields. **Infrastructure** - Real on-call experience: you have carried a pager, triaged a production incident, written a postmortem. - Observability (Datadog/Grafana/Sentry or equivalent), structured logging, alerting. - Production-grade Python backend (FastAPI/Flask), Docker, AWS, PostgreSQL. **Seniority** - 5+ years, with at least one full cycle of shipping *and operating* an ML system that had real users and real failure modes. Kaggle competitions and demos don't substitute for this. - Comfortable operating with significant ambiguity and no safety net. **Nice to have, not required** - Geospatial/GIS experience (PostGIS, OS MasterMap, QGIS). - Prior proptech exposure. - UK planning/RICS domain familiarity. - FCA/FSMA-adjacent compliance experience. ## Practical - British National (Overseas) / right-to-work in the UK required; we cannot sponsor at this stage. - Compensation: competitive salary, cash only — no equity. Open to a fractional/contract arrangement (3–6 months) for the right person if full-time isn't the right fit yet.
Project ID: 40566374
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⭐⭐⭐⭐⭐ Lead Engineer for Computer Vision & LLM Systems ❇️ Hi My Friend, I hope you're doing well. I've reviewed your project requirements and see you're looking for a Lead Engineer in Computer Vision and LLM Systems. Look no further; Zohaib is here to help you! My team has successfully completed 50+ projects in computer vision and machine learning. I will create robust pipelines for floor plans and ensure compliance while enhancing system performance. ➡️ Why Me? I can easily handle your project as I have 5 years of experience in computer vision and LLM systems, specializing in object detection, data pipelines, and architectural design. I also have a strong grip on Python, AWS, and production-grade systems, which ensures I can deliver an efficient solution. ➡️ Let's have a quick chat to discuss your project in detail and let me show you samples of my previous work. I look forward to discussing this with you in our chat. ➡️ Skills & Experience: ✅ Computer Vision ✅ Object Detection ✅ Geometric Reasoning ✅ LLM Architectures ✅ Data Pipeline Management ✅ Python Programming ✅ AWS Services ✅ Docker ✅ PostgreSQL ✅ Observability Tools ✅ Incident Response ✅ Mentorship Waiting for your response! Best Regards, Zohaib
£22 GBP in 40 days
7.9
7.9

Hi, I reviewed the role and it's a very interesting challenge. The combination of computer vision, deterministic appraisal logic, and production-grade LLM architecture is exactly the kind of engineering problem I enjoy solving. What stood out most is your focus on architectural guarantees rather than prompt engineering. I agree that permission-scoped retrieval, strict schema validation, deterministic calculation engines, and post-generation validation are the right approach for a regulated environment. The LLM should narrate validated results, never generate or infer financial figures. I have experience building Python/FastAPI backends, Docker-based deployments, PostgreSQL, production API integrations, RAG pipelines, structured outputs, and observability. I also have experience designing scalable systems where reliability, monitoring, and maintainability are priorities from day one. A few questions: 1. Is the current CV pipeline based on traditional CV, deep learning models, or a hybrid approach? 2. Which vector database and LLM stack are you currently using? 3. Are you open to an initial contract engagement before moving into a longer-term role? I'd be happy to discuss the architecture in more detail and, if appropriate, sign an NDA before reviewing the existing implementation.
£40 GBP in 40 days
7.5
7.5

With over a decade of experience in artificial intelligence software development, data analysis and predictive modeling, I believe I possess the skills necessary to excel in this role. In particular, my expertise in Computer Vision precisely aligns with the needs of your project. Having worked extensively with object detection and segmentation models such as YOLO and Mask R-CNN, I have gained proficiency in working with structured imagery akin to floor plans, CAD drawings, and architectural layouts. This experience also extends to geospatial reasoning on top of CV outputs including polygon extraction, area computation, constraint-based spatial reasoning. In addition to my Computer Vision credentials, my competency in LLM/RAG systems is a relevant value-add for executing this position successfully. With hands-on experience building tool-calling architectures with hard output constraints and employing RAG pipelines for retrieval tuning, I have a thorough understanding of the methodologies involved in producing real-world solutions that adhere to compliance requirements. Moreover, my responsibilities as an AI Engineer have also equipped me with a strong sense of ownership and responsibility when it comes to ensuring product quality, monitoring uptime and swift incident response - all crucial aspects demanded by this role.
£30 GBP in 40 days
7.0
7.0

Hello, Your platform tackles exactly the kind of production AI challenges I enjoy solving. I'm Stefan from WebAIProTech, based in Australia, with over 10 years of software engineering experience and the last 5 years focused on computer vision, LLMs, RAG architectures, AI agents, and production AI systems. I've built AI platforms using FastAPI, Python, OpenAI, vector databases, structured tool-calling, and retrieval architectures where deterministic services remain the source of truth. I also have experience designing secure AI workflows, production observability, and enterprise SaaS systems. While I'm not UK-based, I'm comfortable working UK business hours, collaborating closely with distributed teams, and communicating clearly with both technical and non-technical stakeholders. If remote collaboration is an option, I'd welcome the opportunity to discuss how I can help strengthen your CV pipeline and Otto's production architecture. Best Regards, Stefan
£35 GBP in 40 days
6.6
6.6

Hello!, I am a US-based senior software engineer(frontend, backend, ecommerce, etc) with 15+ years of experience in Python, ML, PostgreSQL, Docker, Flask, FastAPI, computer vision, and deep learning. I read your project carefully. This looks like a Lead Engineer role where the goal is not just CV work, but building reliable AI systems that turn visual data into something useful, scalable, and decision-ready for a PropTech company. That is exactly the kind of problem I enjoy solving. My approach would be: 1. Review your data, workflows, and target outcomes 2. Define the CV/LLM pipeline and API structure 3. Build a Dockerized Flask/FastAPI backend 4. Add PostgreSQL storage and clear visual reporting 5. Test, refine, and prepare for production use Could you please clarify the following questions to help me better understand the project? 1. What type of visual data are you working with, and what is the main output you need? 2. Do you already have data/models in place, or should this start from scratch? 3. Is the focus on R&D/prototyping or a production-ready build? I’ve built similar AI and data products, including CV tooling, LLM-powered dashboards, and API-driven automation systems. I’m serious about the details and would like to make sure I understand the exact outcome before moving fast. If helpful, open a chat and I’ll map out the best path clearly. James Zappi
£35 GBP in 30 days
6.1
6.1

With over a decade of comprehensive ML experience under my belt, I am eager to own the critical facets of your Computer Vision and LLM systems. My proficiency with object detection algorithms, such as YOLO, Detectron2, and Mask R-CNN, combined with the ability to reason geometrically upon their output gives me a strong advantage in delivering quality solutions for your floor plans and plot data segmentation needs. Furthermore, having engaged in OCR development on low-quality scanned/PDF inputs, I understand the importance of fail-safe methods that identify errors rather than perpetuate them quietly. Overall, my academic journey and professional career illustrate a deep understanding of AI systems like yours. My previous works on ML-powered systems for state institutions—a context that requires uncompromising standards—are proof of my ability to rise-to-the-task in ensuring operational stability. Working in synergy with your existing engineers, I am confident I can provide not just mentorship but substantial technical direction as we continue to extend the core differentiated IP of your product: the CV thesis. In conclusion, hiring me means not only engaging a knowledgeable engineer but also a reliable partner to drive this project towards even greater success;
£18 GBP in 40 days
5.7
5.7

I am excited about the opportunity to lead the Computer Vision and LLM systems for your innovative property intelligence platform. With a strong background in computer vision and LLM architectures, I can effectively oversee the development pipeline that converts raw floor plans and plot data into structured geometric representations, ensuring robust outcomes for your users. My experience in objects detection, geometric reasoning, and creating resilient data pipelines aligns perfectly with your needs. Furthermore, I am well-versed in compliance requirements which will ensure that our LLM architectures meet the regulatory standards necessary for successful deployment. I understand the importance of owning the production environment and guaranteeing the integrity of the appraisal engine, especially during crucial pilot phases. My leadership will not only focus on technical aspects but also on mentoring your existing engineers, fostering an environment of growth and collaboration. Can you elaborate on the specific compliance requirements for the LLM outputs? Together, we will enhance Otto’s capabilities, ensuring a reliable and compliant platform that exceeds user expectations. I look forward to contributing to your team's success in this exciting journey.
£18 GBP in 38 days
5.5
5.5

Hello, Your mission of transforming raw floor plans into structured, appraisal-ready data resonates with my experience building production-grade computer vision and LLM systems with high regulatory and architectural demands. I’ve previously owned end-to-end vision pipelines for technical imagery—extracting geometry, segmenting complex CAD/floor plan features, and ensuring reliable area computation, even with degraded or scanned inputs. My work integrating OCR and robust error handling minimizes silent failures and maintains data integrity. On the LLM/RAG side, I’ve implemented permission-scoped retrieval and schema-enforced output in regulated domains, ensuring that context leakage between user tiers is structurally impossible, not just prompt-suppressed. My approach includes strict post-generation validation, adversarial red-teaming for compliance, and enforcing output constraints at the architecture level. I’ve built retrieval-and-narrate systems where the model only surfaces pre-computed results, never generating its own calculations. For infrastructure, I’m comfortable carrying the pager, having built and operated Python (FastAPI/Flask) backends with Docker, PostgreSQL, and observability stacks in live production. My focus is on making failure modes explicit and fixing pipeline fragility at the root. I’m confident I can help you harden your pipeline, close compliance gaps, and extend your core IP. Let’s discuss your current architecture and where the biggest pain points are. Best regards, Gabriel
£27 GBP in 14 days
4.4
4.4

Hi there, With over a decade of expertise in the realm of Computer Vision (CV) and the Langage Learning Model (LLM), I am confident that I am the best-suited freelancer for your project. My CV proficiency includes object detection, segmentation, geometric reasoning, and OCR reliability, which comprise all key elements you mentioned for this position. Having produced striking results with CV in varied industries including satellite and aerial, I can channel my knowledge into intelligently deriving extendible development envelopes from floor plan geometry akin to your project's core requirements. Moreover, my experience with production-level LLM architectures in adhering to hard output constraints plays a vital role in making your compliance logic structurally unbreakable. Your project's need for schema-enforced, denylist-constrained generation for regulatory purposes and vector DB retrieval tuning resonates well with my professional experience. It would be an absolute pleasure for me to take ownership of refining your data pipeline fragility, ensuring uptime, monitoring, and responding to incidents while setting up robust observability stacks.
£27 GBP in 40 days
4.6
4.6

Hi, This is Jorge from IT GLOBAL SOLUTION LLC, based in the U.S. I have strong experience with AI systems, Python backends, computer vision workflows, LLM/RAG architecture, API development, PostgreSQL, Docker, and production-focused software engineering. Your PropTech platform is a strong fit because it requires more than model experimentation—it needs reliable geometry extraction, deterministic calculations, secure LLM context handling, and production ownership. I can help audit and harden the floor-plan-to-geometry pipeline, including boundary extraction, object detection, OCR handling, polygon/area computation, and failure-mode control so the system does not silently return weak appraisal results. On the Otto side, I understand that prompt-level suppression is not a security boundary. I would design permission-scoped retrieval, isolated context construction, strict tool-calling, schema validation, and post-generation compliance checks so the LLM only narrates approved deterministic outputs and never invents numbers or restricted financial language. I’m also comfortable with FastAPI/Flask, PostgreSQL, Docker, AWS-style deployment, structured logging, monitoring, and debugging production systems under real user pressure. My focus would be to make the CV and LLM layers safer, more explainable, and easier to operate as the pilot scales. Let’s connect and go over the details. Best, Jorge
£27 GBP in 40 days
2.6
2.6

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