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Polyglot GraphQL Federation: Part 5 - Observability Across the Stack

Implement end-to-end observability for polyglot GraphQL federation with OpenTelemetry, Tempo, Prometheus, Loki, Alloy, and Pyroscope, including tail sampling, SLOs, and cross-signal correlation.

May 6, 202645 min readArthur Costa
GraphQLFederationOpenTelemetryDistributed Tracing

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April 21, 2026

Polyglot GraphQL Federation: Part 4 - Kong, Apollo Router, and Query Planning

How two gateways compose into a secure, observable API layer with intelligent query planning across subgraphs.

Arthur Costa22 min

April 15, 2026

Object Detection from Scratch: Part 2 - Dataset, Labels, and the Reality of Training Data

Part 2 examines the dataset behind the MTG detector: splits, YOLO labels, class design, annotation noise, and why data quality sets the real performance ceiling.

Arthur Costa20 min

April 9, 2026

Batch Processing: Amortized I/O for Audit Persistence

Amortize disk I/O costs with double-buffered batch processing, continuous flushing, and regulatory-compliant audit logging for trading systems.

arthur51 min

April 6, 2026

Polyglot GraphQL Federation: Part 3 - When GraphQL Meets gRPC and REST

GraphQL is not the only protocol in a federated platform. This article explores how gRPC handles internal Java-to-Java communication while REST powers Stripe payment integration in Go.

Arthur Costa24 min

March 26, 2026

K-FIFO Queues: Relaxed Ordering for Maximum Throughput

Trade strict FIFO ordering for dramatically higher throughput with K-FIFO queues, segmented buffers, and probabilistic fairness for metrics collection.

arthur50 min

March 22, 2026

Polyglot GraphQL Federation: Part 2 - Three Languages, One Schema

How Java, Go, and TypeScript each implement GraphQL Federation 2 subgraphs with entity resolution, schema directives, and database-per-service isolation in a real e-commerce platform.

Arthur Costa28 min

March 15, 2026

Object Detection from Scratch: Part 1 - Why This Project Is Worth Building

Why a Magic: The Gathering card detector is a serious engineering project, not a toy demo. Part 1 frames the product problem, the architecture, and the technical journey ahead.

Arthur Costa18 min

March 7, 2026

Polyglot GraphQL Federation: Part 1 - The Monolith's Breaking Point

Why monolithic GraphQL APIs collapse under the weight of growing teams and domains. An introduction to GraphQL Federation 2 and the architecture behind a polyglot e-commerce platform.

Arthur Costa20 min