aws/amazon-ssm-agent
Sep 2024 – Jan 2026
14 Months active
Languages Used
GoMarkdown
Technical Skills
GoSoftware ArchitectureSystem ProgrammingWindows Developmentbackend developmenttesting
Dragan Mihaljevic
PROFILE
Dragan Mihaljevic
Dragan Mihalj worked extensively on the aws/amazon-ssm-agent repository, delivering features and fixes that improved reliability, security, and maintainability across Windows and cloud environments. He engineered robust hardware information retrieval for future Windows versions, unified platform data access with caching, and enhanced EC2 environment detection. Dragan upgraded core dependencies, including the AWS SDK for Go and cryptographic libraries, to strengthen security and performance. His work on message handling introduced crash-safe persistence and optimized retry logic, reducing operational risk. Using Go, AWS SDK, and WMI, Dragan focused on backend development, dependency management, and system programming, consistently addressing technical debt and future-proofing the codebase.
Overall Statistics
Feature vs Bugs
84%Features
Repository Contributions
31Total
Bugs
3
Commits
31
Features
16
Lines of code
437,097
Activity Months14
Your Network
1551 peopleShared Repositories
27
Work History
January 2026
1 Commits • 1 Features
Jan 1, 2026January 2026: Strengthened the security and reliability of aws/amazon-ssm-agent by upgrading critical cryptographic dependencies to the latest compatible versions, enabling improved security posture and potential performance gains. No major bugs reported this month. Impact includes reduced vulnerability exposure, easier compliance with security advisories, and smoother ongoing maintenance of the crypto stack.
1 Commits • 1 Features
Jan 1, 2026January 2026: Strengthened the security and reliability of aws/amazon-ssm-agent by upgrading critical cryptographic dependencies to the latest compatible versions, enabling improved security posture and potential performance gains. No major bugs reported this month. Impact includes reduced vulnerability exposure, easier compliance with security advisories, and smoother ongoing maintenance of the crypto stack.
January 2026
November 2025
2 Commits • 1 Features
Nov 1, 2025Month 2025-11 summary for aws/amazon-ssm-agent focusing on Reliable Messaging enhancements. Delivered crash-safe reply persistence and enhanced retry handling with unit tests, improving resilience, data integrity, and customer experience.
November 2025
2 Commits • 1 Features
Nov 1, 2025Month 2025-11 summary for aws/amazon-ssm-agent focusing on Reliable Messaging enhancements. Delivered crash-safe reply persistence and enhanced retry handling with unit tests, improving resilience, data integrity, and customer experience.
October 2025
1 Commits • 1 Features
Oct 1, 2025Month: 2025-10 Key features delivered: - Message Handling Reliability Enhancement - Immediate Retry for RunCommand in MGS: Adds immediate retry logic for failed reply messages to the Message Gateway Service (MGS) for RunCommand documents, and optimizes the retry scheduling for persisted failed messages, reducing wait times and improving reliability and responsiveness of message handling. Commit 29a5853031852a40dd730b70f179258b790b5fac (CR-230224547). Major bugs fixed: - No critical bugs fixed this month. Primary focus was delivering reliability improvements to RunCommand messaging. Overall impact and accomplishments: - Strengthened operational reliability of the RunCommand workflow by reducing retry latency and increasing the success rate of message processing, contributing to improved service level performance and customer experience in remote command execution. - The feature supports resilience and fault-tolerance objectives, enabling faster recovery from transient failures and more predictable end-to-end delivery times. Technologies/skills demonstrated: - Message-driven architecture, immediate retry patterns, and retry scheduling optimizations. - Work with RunCommand and the Message Gateway Service (MGS) within aws/amazon-ssm-agent. - Code review collaboration and traceability (CR-230224547).
1 Commits • 1 Features
Oct 1, 2025Month: 2025-10 Key features delivered: - Message Handling Reliability Enhancement - Immediate Retry for RunCommand in MGS: Adds immediate retry logic for failed reply messages to the Message Gateway Service (MGS) for RunCommand documents, and optimizes the retry scheduling for persisted failed messages, reducing wait times and improving reliability and responsiveness of message handling. Commit 29a5853031852a40dd730b70f179258b790b5fac (CR-230224547). Major bugs fixed: - No critical bugs fixed this month. Primary focus was delivering reliability improvements to RunCommand messaging. Overall impact and accomplishments: - Strengthened operational reliability of the RunCommand workflow by reducing retry latency and increasing the success rate of message processing, contributing to improved service level performance and customer experience in remote command execution. - The feature supports resilience and fault-tolerance objectives, enabling faster recovery from transient failures and more predictable end-to-end delivery times. Technologies/skills demonstrated: - Message-driven architecture, immediate retry patterns, and retry scheduling optimizations. - Work with RunCommand and the Message Gateway Service (MGS) within aws/amazon-ssm-agent. - Code review collaboration and traceability (CR-230224547).
October 2025
September 2025
1 Commits • 1 Features
Sep 1, 20252025-09 monthly summary for aws/amazon-ssm-agent: Delivered a targeted logging cleanup to reduce log noise by removing redundant UID error logging. The uid variable is already captured at debug level within the params struct. This improves log clarity and observability with minimal code change. No major bugs fixed this month; main work was a focused cleanup aligned with existing logging strategy.
September 2025
1 Commits • 1 Features
Sep 1, 20252025-09 monthly summary for aws/amazon-ssm-agent: Delivered a targeted logging cleanup to reduce log noise by removing redundant UID error logging. The uid variable is already captured at debug level within the params struct. This improves log clarity and observability with minimal code change. No major bugs fixed this month; main work was a focused cleanup aligned with existing logging strategy.
July 2025
1 Commits
Jul 1, 2025July 2025 — aws/amazon-ssm-agent: Key focus on reliability of host information collection. Implemented GetHostInfo error code prefix parsing fix by switching prefixes from dashes to periods to align with service-side parsing. Also adjusted metrics prefixes by removing dashes to prevent misparsing on the service side. Delivered via commit a61db1ff4d840bb48f470eb58df39cdf473e44f3. Impact: improved host data reliability, reduced parsing errors, and smoother service integration; business value: fewer incidents and faster troubleshooting across environments.
1 Commits
Jul 1, 2025July 2025 — aws/amazon-ssm-agent: Key focus on reliability of host information collection. Implemented GetHostInfo error code prefix parsing fix by switching prefixes from dashes to periods to align with service-side parsing. Also adjusted metrics prefixes by removing dashes to prevent misparsing on the service side. Delivered via commit a61db1ff4d840bb48f470eb58df39cdf473e44f3. Impact: improved host data reliability, reduced parsing errors, and smoother service integration; business value: fewer incidents and faster troubleshooting across environments.
July 2025
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary: Delivered a network reliability and performance improvement for aws/amazon-ssm-agent by upgrading the Network Library to golang.org/x/net v0.38.0. The upgrade includes upstream bug fixes, performance enhancements, and new network features, contributing to more stable remote management operations and reduced network-related incidents. A dedicated commit (3d1bd0b5fd0751cf4175d1ce07f9738c670bf375) applied the change across the repository. No separate defects were fixed this month; value was realized through the upstream improvements in the core network library.
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary: Delivered a network reliability and performance improvement for aws/amazon-ssm-agent by upgrading the Network Library to golang.org/x/net v0.38.0. The upgrade includes upstream bug fixes, performance enhancements, and new network features, contributing to more stable remote management operations and reduced network-related incidents. A dedicated commit (3d1bd0b5fd0751cf4175d1ce07f9738c670bf375) applied the change across the repository. No separate defects were fixed this month; value was realized through the upstream improvements in the core network library.
April 2025
3 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for aws/amazon-ssm-agent focusing on EC2 environment detection and status monitoring enhancements. Delivered metrics instrumentation for EC2Detector and IMDS EC2 status, enforced EC2Detector for EC2 identity determination, integrated EC2Detector into the detection workflow with improved logging and IMDS fallback, and updated tests to cover new behavior. These changes improve reliability, observability, and security posture for EC2 identity reporting and status checks.
3 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for aws/amazon-ssm-agent focusing on EC2 environment detection and status monitoring enhancements. Delivered metrics instrumentation for EC2Detector and IMDS EC2 status, enforced EC2Detector for EC2 identity determination, integrated EC2Detector into the detection workflow with improved logging and IMDS fallback, and updated tests to cover new behavior. These changes improve reliability, observability, and security posture for EC2 identity reporting and status checks.
April 2025
March 2025
3 Commits • 1 Features
Mar 1, 2025March 2025 Monthly Summary: Focused on boosting reliability, security, and performance for the aws/amazon-ssm-agent project. Delivered targeted fixes to domain join robustness and agent lifecycle management, complemented by a major Go toolchain upgrade to strengthen security and runtime performance. The work reduced operational risk, improved user experience during domain joins, and set a stronger foundation for future enhancements.
March 2025
3 Commits • 1 Features
Mar 1, 2025March 2025 Monthly Summary: Focused on boosting reliability, security, and performance for the aws/amazon-ssm-agent project. Delivered targeted fixes to domain join robustness and agent lifecycle management, complemented by a major Go toolchain upgrade to strengthen security and runtime performance. The work reduced operational risk, improved user experience during domain joins, and set a stronger foundation for future enhancements.
February 2025
6 Commits • 3 Features
Feb 1, 2025February 2025 monthly summary for aws/amazon-ssm-agent. Focused on maintainability, observability, and reliability. Key changes included refactoring WMI access and EC2 detector logic to simplify maintenance and reduce technical debt, enhancing instance health telemetry by including EC2 detection results in the UpdateInstanceInformation User-Agent header for richer server-side context, and targeted hygiene efforts to align Go modules, stabilize tests, and prepare release notes. These efforts reduce future maintenance cost, improve diagnostics, and increase release readiness. Notable commits include: bddc7b8f4a3d02caf61269c6a93d2569911a2bb8; 1617a503e61cf5f554ab0f1f8c2cb703fb7babd0; 64e5112010ee7b2b2ba5f8248a66da2b11f1d96d; 6f09d0925469170e89a2571afa7e0ddd62152717; ba907c65503fc970f177c92414c3e43dbd254cca; 3dee01c80ab7a3d06abc4dbe4648283162bf7516
6 Commits • 3 Features
Feb 1, 2025February 2025 monthly summary for aws/amazon-ssm-agent. Focused on maintainability, observability, and reliability. Key changes included refactoring WMI access and EC2 detector logic to simplify maintenance and reduce technical debt, enhancing instance health telemetry by including EC2 detection results in the UpdateInstanceInformation User-Agent header for richer server-side context, and targeted hygiene efforts to align Go modules, stabilize tests, and prepare release notes. These efforts reduce future maintenance cost, improve diagnostics, and increase release readiness. Notable commits include: bddc7b8f4a3d02caf61269c6a93d2569911a2bb8; 1617a503e61cf5f554ab0f1f8c2cb703fb7babd0; 64e5112010ee7b2b2ba5f8248a66da2b11f1d96d; 6f09d0925469170e89a2571afa7e0ddd62152717; ba907c65503fc970f177c92414c3e43dbd254cca; 3dee01c80ab7a3d06abc4dbe4648283162bf7516
February 2025
January 2025
2 Commits • 1 Features
Jan 1, 2025January 2025: Focused on back-end stability and performance by upgrading core dependencies in aws/amazon-ssm-agent. Upgraded AWS SDK Go to v1.55.5 and refreshed other project libraries to improve performance, reliability, and compatibility with AWS services. Release notes were updated to document these changes. No customer-facing feature changes this month; these improvements reduce upgrade risk, enhance runtime stability, and position the project for smoother feature work in Q1.
January 2025
2 Commits • 1 Features
Jan 1, 2025January 2025: Focused on back-end stability and performance by upgrading core dependencies in aws/amazon-ssm-agent. Upgraded AWS SDK Go to v1.55.5 and refreshed other project libraries to improve performance, reliability, and compatibility with AWS services. Release notes were updated to document these changes. No customer-facing feature changes this month; these improvements reduce upgrade risk, enhance runtime stability, and position the project for smoother feature work in Q1.
December 2024
7 Commits • 2 Features
Dec 1, 2024December 2024 (Month: 2024-12) – aws/amazon-ssm-agent: Delivered a unified, cached platform data retrieval path across supported platforms, replacing Get-CimInstance with centralized, WMI-based access to improve performance, logging, and maintainability. Implemented security and compatibility updates by upgrading core dependencies (Go crypto, net, and oauth2) to newer versions to strengthen security posture and compatibility. Result: faster data access and agent startup, cleaner architecture, reduced duplication, and a more secure, maintainable codebase across platforms.
7 Commits • 2 Features
Dec 1, 2024December 2024 (Month: 2024-12) – aws/amazon-ssm-agent: Delivered a unified, cached platform data retrieval path across supported platforms, replacing Get-CimInstance with centralized, WMI-based access to improve performance, logging, and maintainability. Implemented security and compatibility updates by upgrading core dependencies (Go crypto, net, and oauth2) to newer versions to strengthen security posture and compatibility. Result: faster data access and agent startup, cleaner architecture, reduced duplication, and a more secure, maintainable codebase across platforms.
December 2024
November 2024
1 Commits • 1 Features
Nov 1, 2024Delivered a WQL-based hardware information retrieval interface for Windows Server 2025+, replacing WMIC to improve hardware fingerprinting robustness and future compatibility. The change, tracked under commit 34f788b6dfaf5f5a69212c7a7bf31012cf7ea30a ('Added alternative to wmic to support Windows 2025'), reduces reliance on legacy WMIC tooling and enhances cross-version reliability for enterprise Windows deployments.
November 2024
1 Commits • 1 Features
Nov 1, 2024Delivered a WQL-based hardware information retrieval interface for Windows Server 2025+, replacing WMIC to improve hardware fingerprinting robustness and future compatibility. The change, tracked under commit 34f788b6dfaf5f5a69212c7a7bf31012cf7ea30a ('Added alternative to wmic to support Windows 2025'), reduces reliance on legacy WMIC tooling and enhances cross-version reliability for enterprise Windows deployments.
October 2024
1 Commits • 1 Features
Oct 1, 2024Month: 2024-10 — Focused on improving onboarding reliability for on-prem agents in aws/amazon-ssm-agent. Delivered Agent Registration Reliability Enhancement by increasing the RunCommand timeout during the registration process for on-prem instances, improving registration success rates and reducing onboarding failures. Commit ab4144f220eb7c9cc010513d77212658308efb7f. No major bugs fixed this month. Overall impact: higher onboarding reliability, smoother automated management for on-prem deployments, and reduced support overhead. Technologies/skills demonstrated: RunCommand timeout tuning, on-prem registration flow, reliability engineering, code changes in AWS SSM Agent.
1 Commits • 1 Features
Oct 1, 2024Month: 2024-10 — Focused on improving onboarding reliability for on-prem agents in aws/amazon-ssm-agent. Delivered Agent Registration Reliability Enhancement by increasing the RunCommand timeout during the registration process for on-prem instances, improving registration success rates and reducing onboarding failures. Commit ab4144f220eb7c9cc010513d77212658308efb7f. No major bugs fixed this month. Overall impact: higher onboarding reliability, smoother automated management for on-prem deployments, and reduced support overhead. Technologies/skills demonstrated: RunCommand timeout tuning, on-prem registration flow, reliability engineering, code changes in AWS SSM Agent.
October 2024
September 2024
1 Commits • 1 Features
Sep 1, 2024September 2024 monthly summary for aws/amazon-ssm-agent: Delivered a forward-looking Windows OS compatibility enhancement by implementing a new WMI-based hardware information interface and updating the hardware info retrieval path to be resilient to Windows 2025+ changes. This work reduces risk of inventory breakages in enterprise environments and sets the stage for future OS-version evolution. Commit 4f9eda76c53936d190a9f26bd8885ad348742d1d.
September 2024
1 Commits • 1 Features
Sep 1, 2024September 2024 monthly summary for aws/amazon-ssm-agent: Delivered a forward-looking Windows OS compatibility enhancement by implementing a new WMI-based hardware information interface and updating the hardware info retrieval path to be resilient to Windows 2025+ changes. This work reduces risk of inventory breakages in enterprise environments and sets the stage for future OS-version evolution. Commit 4f9eda76c53936d190a9f26bd8885ad348742d1d.
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Quality Metrics
Correctness92.2%
Maintainability89.0%
Architecture89.0%
Performance89.0%
AI Usage67.0%
Skills & Technologies
Programming Languages
GoMarkdown
Technical Skills
API DevelopmentAPI developmentAPI integrationAWSAWS SDKAWS SDK for GoCloud ComputingCloud ServicesDependency ManagementDevOpsGoGo ProgrammingGo developmentModule managementOAuth2
Repositories Contributed To
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