cowprotocol/services
Sep 2025 – Apr 2026
8 Months active
Languages Used
MarkdownRustSQLShellYAMLTOMLDockerfile
Technical Skills
API DevelopmentAutomationBackend DevelopmentCI/CDCode QualityCommand Runner
Marcin Szymczak
PROFILE
Marcin Szymczak
Worked on the cowprotocol/services repository, delivering backend features and reliability improvements across eight months. Built and optimized APIs for order simulation, gasless transactions, and live order performance, leveraging Rust, SQL, and Docker to enhance scalability and maintainability. Introduced read replica support, modularized simulation frameworks, and consolidated Ethereum domain types to streamline code reuse. Addressed data integrity and deployment risk through robust migration management and end-to-end testing. Improved CI/CD reliability by refining GitHub Actions workflows and Docker integration. Collaborated on cross-team refactors, extracting shared utilities and serialization logic, which enabled faster feature delivery and reduced duplication across protocol services.
Overall Statistics
Feature vs Bugs
79%Features
Repository Contributions
32Total
Bugs
4
Commits
32
Features
15
Lines of code
227,635
Activity Months8
Your Network
31 peopleWork History
April 2026
6 Commits • 1 Features
Apr 1, 2026Concise monthly summary for 2026-04 focusing on the cowprotocol/services repository. Highlights include delivering a feature-rich Order Simulation API, addressing critical reliability gaps in CI/CD, and demonstrating strong cross-functional collaboration with clear business value and robust technical execution.
6 Commits • 1 Features
Apr 1, 2026Concise monthly summary for 2026-04 focusing on the cowprotocol/services repository. Highlights include delivering a feature-rich Order Simulation API, addressing critical reliability gaps in CI/CD, and demonstrating strong cross-functional collaboration with clear business value and robust technical execution.
April 2026
March 2026
7 Commits • 4 Features
Mar 1, 2026March 2026: Delivered architecture and reliability improvements in cowprotocol/services, focusing on modularity, robustness, and maintainability across components. Key outcomes include the removal of cyclic dependencies in price estimation, consolidation of http-client usage, strengthened order validation, Ethereum domain types consolidation, and a centralized simulator framework with enhanced config deserialization. All changes were accompanied by end-to-end tests and documentation updates to ensure smooth production adoption and partner integrations.
March 2026
7 Commits • 4 Features
Mar 1, 2026March 2026: Delivered architecture and reliability improvements in cowprotocol/services, focusing on modularity, robustness, and maintainability across components. Key outcomes include the removal of cyclic dependencies in price estimation, consolidation of http-client usage, strengthened order validation, Ethereum domain types consolidation, and a centralized simulator framework with enhanced config deserialization. All changes were accompanied by end-to-end tests and documentation updates to ensure smooth production adoption and partner integrations.
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for cowprotocol/services. Focused on improving data integrity for Ethflow orders and advancing maintainability through a large refactor to share utilities and serialization logic. Delivered a robust true_valid_to correctness fix for Ethflow orders and completed a codebase-wide refactor to extract utilities and serialization into shared crates (serde-ext), enabling cross-service reuse and faster feature delivery. Validated with E2E tests (local_node_eth_flow_tx) and prepared for smoother staging deployments, reducing risk of data inconsistencies in production.
2 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for cowprotocol/services. Focused on improving data integrity for Ethflow orders and advancing maintainability through a large refactor to share utilities and serialization logic. Delivered a robust true_valid_to correctness fix for Ethflow orders and completed a codebase-wide refactor to extract utilities and serialization into shared crates (serde-ext), enabling cross-service reuse and faster feature delivery. Validated with E2E tests (local_node_eth_flow_tx) and prepared for smoother staging deployments, reducing risk of data inconsistencies in production.
February 2026
January 2026
7 Commits • 2 Features
Jan 1, 2026January 2026 (Month: 2026-01) focused on performance hardening of live orders and enabling scalable migrations for validity window features in cowprotocol/services. Delivered structural data model changes and query optimizations, implemented robust migration sequencing, and managed deployment risk with no-op migrations and optional indexing. Rolled back a problematic optimization to preserve production stability while re-planning the rollout.
January 2026
7 Commits • 2 Features
Jan 1, 2026January 2026 (Month: 2026-01) focused on performance hardening of live orders and enabling scalable migrations for validity window features in cowprotocol/services. Delivered structural data model changes and query optimizations, implemented robust migration sequencing, and managed deployment risk with no-op migrations and optional indexing. Rolled back a problematic optimization to preserve production stability while re-planning the rollout.
December 2025
2 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for cowprotocol/services focusing on delivering high-impact features, improving interoperability, and enabling gasless transaction patterns that strengthen the protocol’s liquidity and user experience.
2 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for cowprotocol/services focusing on delivering high-impact features, improving interoperability, and enabling gasless transaction patterns that strengthen the protocol’s liquidity and user experience.
December 2025
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025: Delivered Autopilot Zero-Downtime Deployments for cowprotocol/services by replacing the readiness probe with a startup probe that warms caches before the previous instance shuts down. This enables seamless handovers and near-zero downtime during autopilot transitions. No major bugs fixed this period; primary focus on reliability improvements and deployment readiness validation with infra.
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025: Delivered Autopilot Zero-Downtime Deployments for cowprotocol/services by replacing the readiness probe with a startup probe that warms caches before the previous instance shuts down. This enables seamless handovers and near-zero downtime during autopilot transitions. No major bugs fixed this period; primary focus on reliability improvements and deployment readiness validation with infra.
October 2025
3 Commits • 2 Features
Oct 1, 2025October 2025 monthly summary for cowprotocol/services highlighting key feature deliveries and stability improvements that drive efficiency, configurability, and system resilience.
3 Commits • 2 Features
Oct 1, 2025October 2025 monthly summary for cowprotocol/services highlighting key feature deliveries and stability improvements that drive efficiency, configurability, and system resilience.
October 2025
September 2025
4 Commits • 2 Features
Sep 1, 2025September 2025 - cowprotocol/services: Implemented developer-focused CI/workflow automation via a Justfile to centralize formatting, linting, and test tasks, replacing ad-hoc cargo/nextest calls in CI; introduced read replica support with read/write separation to boost read throughput and scalability; fixed a critical fee ratio validation bug by switching to is_multiple_of for readability and CI reliability. Deliverables improve build consistency, accelerate onboarding and feedback cycles, and scale read-heavy endpoints while maintaining functionality. Technologies demonstrated include Justfile-driven automation, Rust tooling best practices (clippy-oriented fixes), and architecture-level read replica patterns.
September 2025
4 Commits • 2 Features
Sep 1, 2025September 2025 - cowprotocol/services: Implemented developer-focused CI/workflow automation via a Justfile to centralize formatting, linting, and test tasks, replacing ad-hoc cargo/nextest calls in CI; introduced read replica support with read/write separation to boost read throughput and scalability; fixed a critical fee ratio validation bug by switching to is_multiple_of for readability and CI reliability. Deliverables improve build consistency, accelerate onboarding and feedback cycles, and scale read-heavy endpoints while maintaining functionality. Technologies demonstrated include Justfile-driven automation, Rust tooling best practices (clippy-oriented fixes), and architecture-level read replica patterns.
Activity
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Quality Metrics
Correctness92.8%
Maintainability84.4%
Architecture87.8%
Performance86.0%
AI Usage27.4%
Skills & Technologies
Programming Languages
DockerfileMarkdownRustSQLShellTOMLYAML
Technical Skills
API DevelopmentAPI IntegrationAPI developmentAutomationBackend DevelopmentBlockchainCI/CDCode QualityCode RefactoringCommand RunnerConfiguration ManagementConnection PoolingDatabase ManagementDependency ManagementDistributed Systems
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