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Lefteris Karapetsas

PROFILE

Lefteris Karapetsas

Over 19 months, this developer delivered robust backend and API engineering for the rotki/rotki repository, focusing on blockchain data decoding, DeFi integrations, and performance optimization. They built and maintained features such as cross-chain swap routing, staking reward attribution, and CSV import/export, while enhancing reliability through rigorous testing and CI/CD improvements. Using Python, SQL, and TypeScript, they optimized database queries, implemented caching strategies, and modernized dependency management to ensure scalable, maintainable code. Their work included decoding smart contract events, integrating protocols like Curve and Morpho, and strengthening data integrity, resulting in faster analytics, safer upgrades, and improved developer productivity.

Overall Statistics

Feature vs Bugs

68%Features

Repository Contributions

437Total
Bugs
96
Commits
437
Features
200
Lines of code
61,463
Activity Months19

Work History

May 2026

29 Commits • 17 Features

May 1, 2026

May 2026 (rotki/rotki) — Focused on feature delivery for routing and testability, reliability fixes, and performance/packaging improvements. Business value: improved cross-chain swaps routing accuracy, safer endpoint/configuration handling, faster accounting queries, and more flexible test environments, with a leaner, CI-friendly release process.

April 2026

19 Commits • 11 Features

Apr 1, 2026

April 2026 performance summary for nicholasyoder/rotki and rotki/rotki. Focused on expanding cross-chain data handling, enhancing data exports, improving price data reliability, and strengthening testing and code quality. Delivered high-impact features for data fidelity, multi-chain support, and performance, driving clearer analytics for users and more robust ingestion of staking and price data.

March 2026

3 Commits • 1 Features

Mar 1, 2026

Month: 2026-03 | Repo: rotki/rotki Key features delivered: - Reward data handling improvements across Beefy harvest rewards, MEV reward detection, and Pendle reward decoding, improving data accuracy and user experience. Major bugs fixed: - No distinct major bugs reported this month; efforts focused on reliability and decoding accuracy to reduce misattribution of rewards. Overall impact and accomplishments: - Strengthened ROTKI's reward attribution pipeline across multiple DeFi protocols, delivering safer, more transparent reward reporting and improved trust for users and stakeholders. This foundation enables more accurate portfolio analytics and reduces revenue leakage from missed rewards. Technologies/skills demonstrated: - On-chain data decoding and event correlation across cross-protocol rewards - MEV reward attribution techniques including fallback inference when relay data is missing - Cross-contract reward aggregation and legacy pool support for Pendle rewards - Resilience to incomplete metadata through safe fallbacks and robust decoding

February 2026

56 Commits • 32 Features

Feb 1, 2026

February 2026 (2026-02) was anchored in performance, reliability, and scalable data decoding across the Rotki projects. Key features and optimizations reduced database load, avoided expensive per-asset lookups, and strengthened data integrity, enabling faster responses at scale. Major enhancements spanned both repositories: nicholasyoder/rotki and rotki/rotki, with a focus on batch processing, safer decoding paths, and improved query strategies for large datasets. The work delivered business value by lowering latency, decreasing operational costs from database scans, and increasing the robustness of asset history and DeFi decoding. In addition, several quality improvements (linting, tests, and documentation) support maintainability and long-term velocity.

January 2026

21 Commits • 11 Features

Jan 1, 2026

January 2026 performance highlights for nicholasyoder/rotki. Delivered reliability and performance improvements across data import, DeFi swap logic, and historical balance workflows, enabling faster, more scalable portfolio analytics. Key reliability fixes and architectural improvements reduced latency and risk while maintaining velocity through tooling upgrades and test stabilization.

December 2025

18 Commits • 7 Features

Dec 1, 2025

December 2025 (nicholasyoder/rotki) monthly summary highlighting key deliverables, major fixes, and technical impact. Focused on delivering a stable release, streamlined CI/CD, API reliability, and improved data/event handling. The month produced measurable business value through faster releases, more reliable exports, and improved developer productivity.

November 2025

2 Commits • 1 Features

Nov 1, 2025

Monthly summary for 2025-11 focused on delivering maintainable, secure, and future-proof rotki/rotki through dependency modernization and tooling improvements. The month centered on upgrading production libraries and development tooling, with a strong emphasis on code quality, security posture, and long-term maintainability. No major feature releases beyond the upgrades, and no reported critical bugs fixed in this period; the work reduces technical debt and aligns with current external APIs and linter/typing standards.

October 2025

14 Commits • 4 Features

Oct 1, 2025

October 2025: Delivered reliability and security enhancements, fixed critical decoding bug, and modernized the codebase. Key outcomes include OKX regionalization with location-based routing and improved balance error handling, Monerium credential migration during OAuth upgrade, and comprehensive code cleanup and tooling upgrades that enable safer, faster releases.

September 2025

10 Commits • 3 Features

Sep 1, 2025

September 2025 monthly summary for rotki/rotki: Focused on documentation standardization for AI copilots, tooling and dependency modernization, and security/stability enhancements. Delivered concrete improvements in developer experience, code quality, and integration reliability. Fixed critical debugging and asset matching issues to improve operability and trust.

August 2025

29 Commits • 10 Features

Aug 1, 2025

August 2025 monthly summary for rotki/rotki: Delivered reliability, performance, and quality improvements across the storage and data-upgrade paths, with broader test coverage and tooling updates. The work focused on observability, concurrency, and data correctness to reduce production incidents and improve user trust, while enabling faster data access and safer upgrades.

July 2025

13 Commits • 5 Features

Jul 1, 2025

July 2025 delivered high-impact features, security improvements, and tooling upgrades for rotki/rotki. Key features include per-user ETH staking limit enforcement with backend/API updates, Morpho Protocol integration on Ethereum and Base, and a refactor of authentication signature generation into a reusable mixin. Additional value came from comprehensive tooling and dependency upgrades, plus governance and cleanup work. These efforts tightened security, improved reliability and developer experience, and set the foundation for scalable feature delivery and faster iteration.

June 2025

42 Commits • 24 Features

Jun 1, 2025

June 2025 monthly summary for rotki/rotki focusing on delivering business value and technical achievements. Highlights include release management, data integrity improvements, reliability fixes, ecosystem integrations, and developer productivity. The team executed a coherent release strategy, strengthened data correctness across event streams, improved system reliability, expanded ecosystem integrations, and advanced tooling to support ongoing quality and velocity.

May 2025

35 Commits • 12 Features

May 1, 2025

May 2025 focused on expanding Curve-related data decoding, API exposure, and developer tooling, delivering more complete on-chain reconciliation and a smoother release cadence for rotki/rotki.

April 2025

8 Commits • 4 Features

Apr 1, 2025

April 2025 monthly summary for rotki/rotki: Core decoding enhancements, Arbitrum and Gitcoin coverage, and code quality improvements applied. These changes improved financial visibility, accuracy of on-chain activity tracking, and maintainability across the repo.

March 2025

25 Commits • 6 Features

Mar 1, 2025

March 2025 performance-focused update for rotki/rotki: Stabilized the codebase with a broad tooling and dependency refresh, improved test infrastructure, and several high-impact feature and bug fixes that enhance reliability and observability. Delivered upgraded linting/production dependencies, moved test-only code to test utilities, added JSON data logging for rotki's API requests, and expanded API capabilities (ENS resolution). Fixed critical Linux Bitcoin balance queries, Uniswapv3 universal router swaps, GlobalDB versioning in tests, and multiple API data handling bugs to reduce production risk and improve data integrity.

February 2025

29 Commits • 16 Features

Feb 1, 2025

February 2025 focused on stabilization, tooling, and expanding accurate accounting capabilities for rotki/rotki. The work delivered infrastructure improvements and feature work that enable faster iterations, better reliability, and clearer business value. Notable outcomes include upgraded tooling and dependencies, MEV reward handling enhancements, asset movements improvements, funding data addition, and a release-ready 1.38.0 with changelog entries and API cleanup.

January 2025

42 Commits • 25 Features

Jan 1, 2025

January 2025 — Rotki/rotki: A focused month of feature delivery, decoder enhancements, and reliability improvements that increased data accuracy, observability, and developer productivity across the portfolio.

December 2024

23 Commits • 8 Features

Dec 1, 2024

December 2024 performance highlights for rotki/rotki: delivered cross-network data coverage and reliability improvements with a focus on business value, broader asset visibility, and release readiness. Key outcomes include Giveth integration across Optimism and Gnosis (new decoders and population of the global DB, enabling querying balances for staked Giveth across networks); Compound v3 collateral detection; multiple data correctness and edge-case fixes; and a streamlined release process with tooling upgrades. These efforts reduce data gaps, improve accuracy, and accelerate cross-network reporting and decision-making.

November 2024

19 Commits • 3 Features

Nov 1, 2024

November 2024 saw focused delivery on WalletConnect integration, data reliability for Coinbase, and user-facing improvements for Gnosis Pay, complemented by essential dependency upgrades to stabilize the codebase. These efforts delivered measurable business value through more accurate asset tracking, robust data sync, and better user experience, underpinned by stronger development hygiene.

Activity

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Quality Metrics

Correctness94.2%
Maintainability89.6%
Architecture88.0%
Performance86.0%
AI Usage21.2%

Skills & Technologies

Programming Languages

BashINIJSONJavaScriptMakefileMarkdownN/ANonePythonRST

Technical Skills

AI IntegrationAPI DesignAPI DevelopmentAPI DocumentationAPI IntegrationAPI TestingAPI developmentAPI integrationAccounting LogicAddress ChecksummingAsset ManagementBackend DevelopmentBackend developmentBlockchainBlockchain Analysis

Repositories Contributed To

2 repos

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

rotki/rotki

Nov 2024 May 2026
17 Months active

Languages Used

N/APythonRSTRstSVGTextrstSolidity

Technical Skills

API IntegrationBackend DevelopmentBlockchainBug FixBug FixingCode Cleanup

nicholasyoder/rotki

Dec 2025 Apr 2026
4 Months active

Languages Used

JavaScriptPythonTypeScriptYAMLrstMarkdownNoneTOML

Technical Skills

API DevelopmentAPI developmentAPI integrationBackend DevelopmentCI/CDCode Quality