Data Engineer \\ Data Scientist — Unstructured Data & AI Pipelines

Neurons Lab LTD.; Warszawa; On-site; PLN 83,000 - 152,000; Part time

Job summary

Neurons Lab LTD. seeks a part-time Data Engineer to build and operate unstructured data pipelines, including transcripts, emails, Slack chats, and documents.

You will implement entity resolution, embedding and retrieval systems, and scalable orchestrations to support a privacy-conscious data layer for a European investment context. The role emphasizes hands-on data engineering with emphasis on ingestion, backfill, and incremental syncing, while keeping costs and latency in check within a small,

Qualifications

• 4+ years in data engineering with unstructured/semi-structured work
• Experience integrating many third-party APIs into one coherent store
• Experience building pipelines feeding an LLM / retrieval system
• Experience handling sensitive personal data in a regulated environment
• Comfortable being the only data engineer on a small (2.5-FTE) pod, part-time
• Clear written English for handover documentation

Responsibilities

• Stand up capture and ingestion from calls, email, Slack, and messengers with speaker attribution
• Backfill archive data: emails, chats, decks, and portfolio updates
• Build document parsing for PDFs, spreadsheets, and slide decks
• Implement identity/entity resolution across sources
• Build chunking and embedding pipelines and load vector/graph stores
• Implement incremental sync with a connector layer and handle edits/deletions
• Attach access scope and provenance to records at ingestion
• Run PII detection, redaction, and retention logic
• Orchestrate pipelines with Airflow/Step Functions with monitoring
• Control cost and latency with batching and storage tiering
• Write runbooks for client handover

Skills

Python

SQL

Unstructured data pipelines

Embedding systems

Vector stores

API integration

Airflow

Cloud stack

PII handling

Data governance

English writing

Tools

pgvector

OpenSearch

Pinecone

Airflow

Step Functions

Job description

About The Project (description, Duration, Stage)

Join Neurons Lab as a Data Engineer (part-time) on a flagship engagement with a European private investment group — a holding company with a C-level executive team, an investment/portfolio function and an affiliated family office.

The programme builds one private, access-scoped context layer over the group's data, then AI skills and agents on top of it. You build the plumbing underneath: Phase 1 (Capture) — turn on ingestion across calls, email, Slack and messengers, board protocols, decks and portfolio updates, live and historical; Phase 2 (Connect) — land it all in the context layer with identity resolved, access scope attached and lineage intact.

This is deliberately an unstructured-first data-engineering role. There is no clean warehouse to model: the raw material is transcripts, threads, attachments and years of archive, and the hard problems are entity resolution across people and entities, deduplication, incremental sync, PII handling, and keeping cost sane at volume.

Roughly eight to ten two-week sprints overall, with your load front-weighted to the first four or five — allocation may flex above 0.5 FTE during Capture and Connect and settle back afterwards.

Stage: active project, start ASAP.

Part-time, 20 to 30 hours-a-week engagement.

What You'll Actually Do (example Tasks)

• Stand up capture by default: notetaker on every call with speaker attribution, plus ingestion from mail, Slack and messengers — designed as opt-out, not opt-in, and reversible if the client changes their mind.
• Backfill the archive: years of historical email, Slack, board protocols, decks and portfolio updates — parsed, deduplicated and dated correctly.
• Build document parsing for the awkward long tail: PDFs, scanned board packs, spreadsheets, slide decks, forwarded attachments.
• Implement identity / entity resolution: the same person across Slack handle, mail alias and calendar invite; the same portfolio company across a deck, a mail thread and a CRM record.
• Build chunking and embedding pipelines and load the vector + graph stores behind the ontology the architect defines.
• Implement incremental sync through the connector layer (MCP / Composio-class) — no full re-crawls, no silent drift, clear handling of edits and deletions.
• Attach access scope and provenance to every record at ingestion, so permission-aware retrieval and audit are possible downstream rather than bolted on.
• Run PII detection, redaction and retention logic; evidence to the client's security function what is stored, where, and for how long.
• Orchestrate with Airflow / Step Functions; build repeatable, monitored pipelines rather than scripts, with alerting when a source stops flowing.
• Keep cost and latency under control at volume — batching, incremental embedding, storage tiering — and report the unit economics.
• Write runbooks so the client's own team can operate this after handover.

Skills

• Strong Python and solid SQL
• Unstructured-data pipelines: transcripts, mail, chat, documents — parsing, normalisation, deduplication
• Embedding / retrieval infrastructure: chunking strategies, vector stores (pgvector, OpenSearch, Pinecone-class), plus loading a graph store
• API and connector integration at scale: Google Workspace / M365, Slack, CRM; rate limits, pagination, incremental cursors, webhooks
• Entity resolution / record linkage (deterministic + fuzzy) without a clean shared key
• Orchestration: Airflow, Step Functions or equivalent; idempotent, restartable jobs
• AWS and/or GCP data stack; comfortable in a private / VPC deployment
• PII detection, redaction, encryption and retention in practice
• Clear written English; documents for handover and works well async in a small distributed pod

Knowledge

• GDPR applied to employee-generated data (mail, chat, meeting recordings) and EU data residency across multiple jurisdictions
• Data lineage, provenance and audit patterns — and why an AI system needs them more, not less
• How retrieval quality depends on ingestion quality — enough understanding of RAG to make the right upstream choices
• Well-Architected security and cost practice; awareness of financial-services expectations — a plus

Experience

• 4+ years in data engineering, with real unstructured / semi-structured work (not only warehouse modelling)
• Demonstrated experience integrating many third-party APIs into one coherent store, including historical backfill
• Experience building pipelines feeding an LLM / retrieval system — strong plus
• Experience handling sensitive personal data in a regulated or security-sensitive environment
• Comfortable being the only data engineer on a small (2.5-FTE) pod, at part-time allocation, without hand-holding