Data Engineer - Data Platform

Firmable; Kolkata District; On-site; INR 900,000 - 1,500,000; Full time

Job summary

Firmable is seeking a Data Engineer — Data Platform to design and operate data pipelines that turn billions of raw records into clean, modelled datasets used by analytics and AI systems. You’ll handle SQL, dbt, orchestration, and warehouse performance, with a focus on LLM-based extraction at scale.

You will own reliability, cost, and data trust, balancing deterministic SQL checks with semantic LLM judgments and building robust harnesses to catch regressions as vendors update models.

Qualifications

• 3+ years building production data pipelines.
• 2+ years with Snowflake.
• Proficient Python and SQL for large-scale data processing.
• Experience shipping LLMs inside data pipelines with structured outputs.
• Strong reasoning on rules vs LLMs and observable engineering.

Responsibilities

• Build end-to-end data pipelines for billions of records daily.
• Develop and maintain LLM-based extraction, enrichment, and validation steps.
• Ensure reliability, cost control, and data trust for downstream consumers.
• Create and maintain eval harnesses, prompts, and versioning.
• Implement observability and alerting for pipeline health and drift.

Skills

Python

SQL

LLM integration

dbt

Airflow

Snowflake

Cost optimization

Tools

Snowflake

Airflow

dbt

Spark

Kubernetes

AWS

OpenTelemetry

Job description

Firmable is the market-leading B2B sales intelligence platform in Asia Pacific — and we're scaling that success globally at pace. Backed by leading investors and 2,000+ customers strong, we exist to give sales teams an unfair advantage: the deepest company and people data of any platform, enriched with real-time signals, served at the right moment by intelligent agents.

Our data is the product. Building it now means building with LLMs in the pipeline, and knowing exactly when to trust them.

The Role

As Data Engineer — Data Platform, you'll build the pipelines that turn billions of raw records into the clean, modelled datasets our product, analytics, and AI systems depend on. Some of that is classic data engineering: SQL, dbt, orchestration, warehouse performance. A growing share is not: LLM-based extraction, enrichment, and validation running inside the pipeline at scale.

The hard part isn't calling a model. It's making a probabilistic component behave like a reliable one: labelled eval sets, precision and recall you can measure, versioned prompts, cost ceilings, and the harnesses that catch regressions when a vendor silently changes the model under you.

This is a hands-on engineering role with real ownership. You'll own reliability, cost, and whether downstream consumers can trust the data, whether it came from a SQL join or a language model.

What You'll Own

• LLM-in-the-pipeline systems — extraction, enrichment, entity resolution, and semantic validation steps that run over millions of records a day with structured outputs, retries, and human-review fallbacks
• Eval harnesses — labelled sets, scorers, and regression suites that gate every prompt or model change; precision/recall tracked per check, not vibes
• Rules vs. LLMs — deterministic checks (dbt tests, data contracts, SQL) wherever structure allows; LLMs where semantic judgement is needed; the discipline to know which is which
• Cost and drift — token budgets per pipeline, model routing (cheap models for classification, stronger ones for hard cases), drift detection on vendor updates
• Observability — every LLM call logged with prompt version, model, cost, latency, and decision, alongside standard pipeline alerting that surfaces problems before they cascade
• Core pipelines and warehouse — Airflow orchestration, dbt models across staging to mart, Snowflake performance and cost over billions of rows, AWS infrastructure as code
• Matching and deduplication — embeddings and retrieval patterns for company and people entity resolution across 13 markets

What We're Looking For

Must Haves

• 3+ years in data engineering or data infrastructure, with production pipelines you've owned end to end and 2+ years experience with Snowflake
• Strong Python and SQL — production-grade, performance-aware, comfortable at very large scale
• Shipped LLMs inside data pipelines — extraction, enrichment, or validation in production, with structured outputs and a labelled eval set that tells you where the model gets it wrong
• Harness engineering experience — you've built or maintained eval or test harnesses for LLM outputs, and you can talk through what they caught
• Sharp judgement on rules vs. LLMs — you reach for a regex or a dbt test first and can defend the call either way
• Production dbt and Airflow — modular, tested models; DAGs that recover gracefully
• Cloud warehouse experience — Snowflake preferred; schema design, query optimisation, cost management
• AI coding tools are how you work — Claude Code, Cursor, or equivalent, daily, with real shipped work to show for it
• Ownership and systems thinking — you weigh upstream dependencies and downstream impact before changing anything

Highly Valued

• Eval frameworks and LLM tracing (Logfire, OpenTelemetry)
• Embeddings, vector search, or fuzzy matching for entity resolution at scale
• Fine-tuning or distilling small models to replace expensive LLM calls
• AWS at scale (S3, Lambda, Glue, ECS, RDS) and PostgreSQL
• Spark or PySpark; streaming (Kafka, Kinesis, Snowpipe Streaming)
• Data privacy and compliance (GDPR, SOC2, CCPA)

How We Build

Firmable is an AI-native organisation. AI coding tools, automated testing, and AI-assisted review are how we work by default. Every LLM check ships with a labelled eval set, measured precision/recall, and a prompt version you can roll back. Every LLM call in production is logged from day one; retrofitting later is not the plan.

We run lean and ship fast — small senior teams, no layers, minimal process, weekly releases moving toward daily. Teams own their stack end to end. There are no fixed hours and no handholding. If you're not already working this way, this role isn't right for you.

Why This Role

• LLMs as production infrastructure — not a demo, not a notebook; models making millions of decisions a day on data customers pay for
• Greenfield harnesses — eval coverage, drift detection, and cost controls for in-pipeline LLMs are largely unbuilt; you'll ship them
• Scale that matters — billions of rows, 13 markets, and a dataset nobody else has
• Small team, massive leverage — your pipelines reach every Firmable customer, every day
• Competitive base + meaningful equity — a share in the upside we're building toward

Firmable is an equal opportunity employer. We believe diverse teams build better products.

Ready to build the AI-native data platform behind the world's smartest B2B sales intelligence platform?