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Nikola Velickovic

PROFILE

Nikola Velickovic

Nikola Velickovic contributed to the tenstorrent/tt-llk and tenstorrent/tt-metal repositories, focusing on low-level C++ and Python development for embedded systems and high-performance computing. He delivered features and bug fixes that improved data-path reliability, optimized matrix multiplication, and enhanced documentation for onboarding and collaboration. His work included refining tile processing logic, stabilizing benchmarks, and consolidating repository governance through CODEOWNERS updates. By addressing configuration validation, debugging tensor operations, and streamlining migration to consolidated codebases, Nikola demonstrated depth in kernel development, code refactoring, and performance optimization. His contributions reduced production risk and improved maintainability across critical compute and hardware acceleration paths.

Overall Statistics

Feature vs Bugs

45%Features

Repository Contributions

27Total
Bugs
11
Commits
27
Features
9
Lines of code
927
Activity Months8

Work History

September 2025

1 Commits • 1 Features

Sep 1, 2025

September 2025: Focused on improving code-review efficiency in tenstorrent/tt-metal by updating CODEOWNERS to broaden approvals for LLK and compute API changes, addressing review bottlenecks and maintaining momentum on related work. The change aligns ownership with team responsibilities and supports faster PR cycles without sacrificing quality.

July 2025

3 Commits • 2 Features

Jul 1, 2025

July 2025 milestone for tenstorrent/tt-metal: Delivered two focused features that strengthen collaboration, correctness, and observability in the compute path. Code ownership and governance were improved via an expanded CODEOWNERS file for the Compute API, enabling faster reviews and clearer accountability. Debugging and verification improvements were implemented for attention matrix multiplication, including input shape adjustments, output verification, test parameter updates, and tracing prints to ensure tensor operation accuracy in critical paths. These changes were committed in three changesets; CODEOWNERS updates referenced in two commits (b10dde25c1e64a91d98c86c458f85ec3a1ef8c1c; 6d9e78c055415cd1c012d8aa929318fd7d497c55) and attn matmul debugging in a single commit (aebad4c1c69eadefac6ff0d591244e40f06250e4).

May 2025

2 Commits

May 1, 2025

May 2025 — Performance and reliability focus across tenstorrent/tt-metal and tenstorrent/tt-llk. Key outcomes include targeted bug fixes that harden the data-path and reduce production risk, with no new user-facing features delivered this month. Key actions: - tt-metal: Removed an unused NoC API call to prevent potential errors and improve code clarity. (Commit: b1dd9965d45389ef2296e05fa04ec6f15bfb9581) - tt-llk: Corrected config context usage in unpack tilize for INT32 when DEST is involved by resetting the config context to 0 prior to execution. This improves reliability of the unpack tilize operation. (Commit: aadad76681dd02c789290e54d4a7a5af2d704e71) Overall impact and accomplishments: - Increased runtime reliability and correctness in critical data-path operations, reducing risk of production-time errors. - Improved maintainability and clarity of low-level code through careful cleanup and state management. Technologies/skills demonstrated: - Low-level debugging and refactoring (C/C++-level changes implied by config context and API usage). - API hygiene, state management, and configuration handling in performance-sensitive paths. - Change impact assessment focused on business value: reduced outage risk, easier maintenance, and clearer code semantics.

April 2025

11 Commits • 3 Features

Apr 1, 2025

April 2025: Key repository work focused on improving onboarding/documentation, stabilizing benchmarks, and optimizing data transfers to boost reliability and reduce maintenance. In tt-llk, expanded repository overview and contribution guidelines to streamline onboarding and collaboration; cleaned up configuration by removing an unused URL in setup_external_testing_env.sh with no functional impact. In tt-metal, stabilized BH benchmark tests for reliable CI runs, isolated and addressed bfloat16 PCIe-related stability issues on full-grid runs, and reduced network overhead by turning off NOC data movement for SDPA.

March 2025

2 Commits

Mar 1, 2025

March 2025 (2025-03) monthly summary for tenstorrent/tt-llk focused on stability and correctness. No new features delivered this month; two high-impact bug fixes were completed to improve runtime safety and generality, strengthening the foundation for dynamic workloads.

February 2025

3 Commits • 3 Features

Feb 1, 2025

February 2025 monthly summary for tenstorrent LLK repositories. Focused on governance, deprecation, and consolidation efforts to streamline development and reduce maintenance overhead. Key features delivered include deprecation notices and migration/redirect guidance across three LLK repositories, preparing for archival of legacy repos and centralizing development in the consolidated LLK repository. No user-facing feature work completed this month beyond documentation and routing changes; however, these changes establish a clear path for ongoing work and minimized developer confusion.

January 2025

3 Commits

Jan 1, 2025

January 2025 performance summary for tt-llk, tt-llk-bh, and tt-metal focused on robustness of MOP handling and stability of Maxpool operations. Delivered defensive fixes and safe-default behaviors to prevent runtime errors and outages, aligning guardrails across repositories for safer future changes.

November 2024

2 Commits

Nov 1, 2024

November 2024 monthly summary focusing on bug fixes and maintainability improvements to PACKER tile processing in two repositories. Delivered critical corrections to tilize/untilize tile closing, refined last-row handling, and cleaned dead code with clarified comments to improve readability. While no new features were shipped this month, the fixes enhanced data integrity and system reliability for tile-based operations across both repos.

Activity

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Quality Metrics

Correctness90.8%
Maintainability89.6%
Architecture89.6%
Performance87.4%
AI Usage20.0%

Skills & Technologies

Programming Languages

C++MarkdownNonePythonShellplaintext

Technical Skills

Bug fixingC++C++ developmentCompiler designDocumentationEmbedded SystemsEmbedded systemsHardware AccelerationHardware ConfigurationHardware accelerationKernel developmentLow-Level ProgrammingLow-level programmingNoneNumerical computation

Repositories Contributed To

4 repos

Overview of all repositories you've contributed to across your timeline

tenstorrent/tt-metal

Jan 2025 Sep 2025
5 Months active

Languages Used

NoneC++PythonMarkdownplaintext

Technical Skills

NoneC++Pythonbenchmarkingdebuggingembedded systems

tenstorrent/tt-llk

Nov 2024 May 2025
6 Months active

Languages Used

C++MarkdownShell

Technical Skills

Embedded systemsHardware accelerationLow-level programmingEmbedded SystemsHardware ConfigurationLow-Level Programming

tenstorrent/tt-llk-bh

Nov 2024 Feb 2025
3 Months active

Languages Used

C++Markdown

Technical Skills

Embedded SystemsHardware AccelerationLow-Level ProgrammingHardware ConfigurationDocumentation

tenstorrent/tt-llk-wh-b0

Feb 2025 Feb 2025
1 Month active

Languages Used

Markdown

Technical Skills

Documentation

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