James Moessis
Senior Software Engineer at Atlassian
Sydney, New South Wales, Australia
Summary
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Rockstar🎓
Top SchoolJames Moessis is a Senior Software Engineer based in Sydney with eight years’ experience building high-throughput observability systems at Atlassian. He specializes in back-end engineering for OpenTelemetry—authoring components in the Collector and Java SDK and contributing 160+ OSS changes that are used across the industry. His work includes implementing ASAP client authentication, delta aggregation in the Collector, and optimizing exponential histogram aggregation and OTLP marshaling for Java, improving both correctness and performance at scale. Comfortable at the intersection of systems, telemetry, and large-scale data pipelines, he pairs practical production ownership with academic rigour from dual engineering and computer science degrees. An unassuming but prolific contributor, he focuses on subtle algorithmic and data-structure improvements that yield big wins in observability telemetry.
8 years of coding experience
5 years of employment as a software developer
The University of SydneyBachelor of Electrical Engineering (Honours), Bachelor of Electrical Engineering (Honours) at University of Technology Sydney
Stackoverflow
813reputation
40kreached
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Github Skills (24)
data-collection10
apidoc10
testing10
authentication10
user-authentication10
data-structure10
java10
javas10
go10
api10
opentelemetry10
collections10
data-structures10
metric10
algorithm9
Programming languages (9)
Github contributions (5)
open-telemetry/opentelemetry-collector-contrib
Nov 2021 - Jan 2023
Contrib repository for the OpenTelemetry Collector
Role in this project:
Back-end Developer
Back-end DeveloperContributions:202 reviews, 20 commits, 34 PRs in 1 year 1 month
Contributions summary:James contributed to the implementation of an ASAP client authentication extension, adding it to the components list and updating the necessary go.mod files. They implemented the core logic for authentication, including generating and validating ASAP tokens, and integrated it into the OpenTelemetry Collector. Additionally, they modified the processor to support delta aggregation, improving the system's ability to calculate metrics.
contribopentelemetry-collectortracingtempoobservability
open-telemetry/opentelemetry-java
Sep 2021 - Feb 2022
OpenTelemetry Java SDK
Role in this project:Back-end Developer
Back-end DeveloperContributions:63 reviews, 5 commits, 5 PRs in 4 months
Contributions summary:James primarily contributed to the OpenTelemetry Java SDK, focusing on the implementation and optimization of exponential histogram aggregation. Their work involved developing data classes for exponential histograms, refactoring and improving the bucket indexing strategy. Additionally, they implemented OTLP marshalers to correctly write repeated uint64, and integrated the new exponential histogram functionality. The contributions also included enhancements to the existing tests and improvements to performance.
tracingobservabilitysdkotelopentelemetry-java
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