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Case Studies · Data Engineering

Data Engineering

Schemas drift the moment a source system updates, pipelines fail in ways nobody catches until the report is already wrong, and the LLM wired into the data path hallucinates classifications downstream teams can't trust. AlgoCoder builds data infrastructure that holds under real production volume.

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Engineering Notes · 12 Notes

Data Engineering — recurring patterns.

Data EngineeringETL orchestration

ETL Pipeline Rebuild for a Reporting Layer That Was Always Stale

The overnight job ran for six hours. The data was stale by lunch.

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Data EngineeringSchema validation

Schema Validation Layer for a Platform With Recurring Production Breaks

Source systems were changing schemas without telling the data team. The downstream pipeline broke once a week.

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Data EngineeringReal-time streaming

Real-Time Streaming Pipeline for a Platform Whose "Real-Time" Wasn't Real-Time

The product promised real-time. The pipeline delivered ninety seconds late.

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Data EngineeringData lake to lakehouse

Lakehouse Migration for an Organization Whose Data Lake Had Become a Data Swamp

Years of files, no governance, no schema registry, no idea what was where.

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Data Engineering · with AI/LLM crossoverLLM-embedded pipelines

LLM-Embedded Pipeline for Production Data Enrichment

The team had a working LLM enrichment in development. Putting it in the production data path was a different problem.

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Data EngineeringQuality + observability

Data Quality and Lineage Implementation for a Reporting Layer Nobody Trusted

The dashboards showed numbers. Nobody trusted the numbers. Decisions were being made by gut.

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Data EngineeringWhen NOT to use Snowflake

Warehouse Architecture Decision for a Team Outgrowing Snowflake's Cost Profile

Snowflake had been the right choice. The team's query patterns had moved into a category where it wasn't anymore.

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Data EngineeringETL orchestration (extended)

Change Data Capture Implementation for a Source System That Had Resisted It

The team had been doing nightly snapshots for years. Real-time downstream needs made that untenable.

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Data EngineeringData lake to lakehouse (extended into organizational structure)

Data Mesh Decomposition for a Centralized Data Team That Had Become a Bottleneck

Every product team needed data work. The central data team couldn't service the queue.

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Data EngineeringReal-time streaming (extended)

Streaming Analytics Layer for a Product That Needed to Surface User Behavior in Near Real Time

Product analytics was running on a daily batch. Product decisions needed to happen faster.

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Data EngineeringWhen NOT to use Snowflake (extended into platform choice)

Data Warehouse Migration for a Team Stuck on a Legacy Platform

The legacy warehouse worked. It also cost more than the rest of the data stack combined and the vendor was slow-rolling features the team needed.

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Data EngineeringQuality + observability (extended into discoverability)

Data Catalog Implementation for an Organization Where Nobody Could Find Anything

The data existed. Finding it required asking three people who had been there long enough to remember.

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Data Engineering

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