January 2026: zkSync OS Server readiness improvements focused on delivering draft-v31 compatibility via updated integration tests. Implemented alignment of tests and contract dependencies with draft-v31 specifications to enhance interoperability within the zkSync ecosystem and reduce integration risk ahead of releases.

December 2025 monthly summary focused on improving contract script reliability and developer productivity in the matter-labs/era-contracts repository. Delivered a permissions upgrade for the script-out directory to enable full script output functionality and fixed a permissions regression in the main branch, reducing script-output failures and friction in automation workflows.

November 2025 monthly summary: Focused on upgrade readiness across two Matter Labs repos. Implemented a temporary Bytecode Upgrade mechanism in zksync-os-server by embedding a hardcoded JSON of bytecode hashes and preimages into the binary (via include_str!) to support protocol upgrades until BytecodeSupplier-based reading is available. This approach ships with no extra dependencies and demonstrates cross-team collaboration (co-authored-by Igor Aleksanov). In zksync-era, prepared mainnet upgrade data for v29 and added calldata generation for chain upgrades, enabling upgrade calldata to be produced via the zkstack generate-v29-chain-upgrade workflow. These changes reduce upgrade risk, enable automated calldata generation, and position the platform for future contract freezes.

In 2025-10, delivered Development Workflow and Governance Enhancements for matter-labs/era-contracts, introducing CI/CD pipelines, code quality tooling, and governance controls to improve security, compliance, and developer velocity. The changes, merged in PR #1419 (v29), establish standardized workflows and policy checks that reduce risk and accelerate PR validation, setting a solid foundation for ongoing governance-driven development.

August 2025: Cross-repo improvements across matter-labs/era-contracts and matter-labs/zksync-era focused on verifier reliability, build hygiene, and configuration stability. Delivered key updates to verifier keys and contract instructions, along with build- and flag-cleanup to reduce configuration drift and maintenance burden. Resulting in more reliable zk verification flows, shorter and deterministic build times, and easier onboarding for contributors.

July 2025 performance summary focusing on upgrade readiness and cross-chain reliability for matter-labs repositories. Delivered substantial upgrade capability for ZKStack with v29 support, enhanced CLI upgrade management, and improved cross-chain withdrawal messaging compatibility with zksync-era formats across zksync-era and zksync-os. No major bugs documented; changes emphasize reliability, testing readiness, and a smoother upgrade path for production deployments.

June 2025 — Matter Labs/ZkSync OS: Focused on strengthening transaction cost reliability and developer productivity. Implemented a revised upgrade transaction fee model with UPGRADE_TX_NATIVE_PER_GAS, enhanced resource management to explicitly track and return withheld resources, and ensured L1 transactions consistently use max_fee_per_gas for robust processing under varying base fees. Concurrently, shipped development workflow tooling to accelerate local Era builds by introducing shell scripts that automate rebuilding and deployment of app.bin and app_logging_enabled.bin to the target directory, reducing setup time and human error for developers. These changes reduce fee unpredictability, improve resource handling, and streamline local development, contributing to a more stable upgrade path and faster iteration cycles.

Concise monthly summary for May 2025 focusing on key business value and technical achievements across two repos (matter-labs/zksync-era and matter-labs/era-contracts).

April 2025 monthly summary focusing on key deliverables across matter-labs/zksync-era and matter-labs/era-contracts. This month delivered upgrade tooling, gateway visibility improvements, deployment/config enhancements, upgrade testing, and verification automation, with notable reliability improvements.

March 2025 performance highlights across matter-labs/era-contracts and matter-labs/zksync-era. Delivered key features and fixes to strengthen upgrade readiness, deployment reliability, and network safety for the v26 upgrade. Key results include deployment automation enhancements with ChainAdminOwnable, richer AttestationData, and a more robust upgrade finalization flow; governance and genesis configurations synchronized across testnet and mainnet; L1-L2 deposit safety gating and gateway compatibility checks to prevent unsafe migrations; updated upgrade infra and YAML configs for v26/mainnet/testnet, including ecosystem version bumps and validator timelocks; expanded test coverage for wrapped token metadata on new chains. Critical fixes addressed incorrect ServerNotifier deployment addressing and mempool prioritization accuracy. These deliver business value by reducing upgrade risk, ensuring correct deployment records, and accelerating time-to-market for major network upgrades.

Feb 2025 performance summary: Delivered significant upgrades to gateway deployment workflows and token migration capabilities, strengthened security posture with OZ audit integration, and improved data readiness for mainnet upgrades. Implemented automated gateway upgrade automation, stage/testnet YAML configurations, and robust finalization scripts; added L2 token registration and an events_gatherer to reliably fetch deployment logs from L1/L2. Corrected genesis/root and chain creation parameters to ensure reliable chain initialization, updated CI/genesis YAML, and harmonized versioning/build hygiene. Enhanced test stability and L2 compatibility, and published updated upgrade data for mainnet. These efforts delivered measurable business value: safer, faster upgrade cycles; more reliable token migrations; improved build determinism and governance readiness; and stronger observability around upgrade events.

January 2025 performance summary for matter-labs/zksync-era and matter-labs/era-contracts. This month focused on stabilizing gateway-related workflows, advancing gateway contract readiness, and improving L2 contract reliability, while expanding deployment visibility and maintaining high code quality. Efforts spanned gateway integration, protocol-version encoding, upgrade scripting for staged deployments, build and formatting enhancements, and deployment/documentation improvements that together reduce risk and accelerate secure releases.

December 2024 (2024-12) monthly summary for the Matter Labs repositories. Delivered a mix of feature enhancements and high-impact fixes across era-contracts and zksync-era, focusing on reliability, observability, cost efficiency, and upgrade readiness. Key business value is reflected in lower on-chain costs, improved deployment visibility, and a smoother upgrade path for protocol changes.

November 2024 highlights for matter-labs/era-contracts: Delivered interoperability and reliability improvements across the codebase, with a focus on server and L2 environments, security, and maintainability. Implemented a server-compatible registry to enable server environment interoperability, integrated L2 chain admin usage for streamlined operations, migrated from gateway to a modern gateway path, and expanded token support with WETH non-standard tokens. Also completed codebase maintenance and formatting (lint/format) to reduce technical debt and accelerate future changes. Audits and security: Integrated Audittens audit C01 and applied a comprehensive set of bug fixes across the Audittens H-series (H01–H05) and I-series (I03, I04, I05, I07, I10, I11, I17, I21), plus module reliability fixes for I08, I09, I15, I16, stabilizing core functionality and edge-case handling. Dependency/tooling modernization: Upgraded Foundry to 1.5.0, removed the DA contracts dependency, and adjusted zksync Foundry usage for improved stability and security posture. These changes reduce risk and set a solid foundation for upcoming features. Overall impact: Strengthened security posture, expanded interoperability with server and L2 ecosystems, and improved maintainability and deployment reliability, enabling faster delivery of business-value features.

October 2024 focused on stabilizing and documenting the ERA Contracts stack, while expanding Foundry-based workflows and strengthening code quality to accelerate safe delivery. The month delivered comprehensive documentation upgrades, foundational admin refactors, and broad cleanups that reduce technical debt and improve onboarding. We also added new capabilities for DA contracts, Tup bytecode emission, and Foundry-based SC tooling, complemented by performance and CI/test reliability improvements to ensure faster, safer iterations.