Senior C++ Software Engineer for Performance-Critical Systems

Context: OpenTibiaBR Canary is a large C++/Lua online server runtime where startup touches scripts, map data, tile caches, spawn configuration, and runtime registries.

Problem: Startup had expensive hot paths that slowed iteration and operational startup.

Solution: Optimized Lua loading, map parsing, tile cache construction, zone indexing, and spawn startup without changing expected runtime behavior.

Impact: Script/module loading dropped from about 54 seconds to roughly 1.5-3.0 seconds in public PR measurements.

Context: Some C++ package-manager and cross-build workflows use a host protoc while target packages only need protobuf::libprotobuf-lite.

Problem: The target-side Protobuf package could still pay build and install cost for full runtime and compiler-side artifacts that the target dependency graph did not need.

Solution: Implemented upstream Protobuf CMake support for a constrained lite-only runtime build and contributed the vcpkg port change that makes libprotoc opt-in for non-native target builds.

Impact: The Protobuf change landed through Copybara as public commit 7c090172. The local PoC measured the build step dropping from 508.063s to 55.648s and installed footprint from 113,754 KB to 21,579 KB.

Context: Long-running C++/Lua server runtimes need correct ownership boundaries, efficient persistence paths, and stable client synchronization during bulk state mutations.

Problem: Lua shared userdata could miss typed finalizers, hot paths created avoidable shared_ptr churn, query construction allocated more than necessary, and bulk container mutations could send repeated intermediate updates.

Solution: Hardened shared userdata cleanup, reduced avoidable refcount churn, reused query buffers, and added batch update behavior for player/container mutations.

Impact: Improved runtime safety and reduced avoidable work across memory ownership, persistence, movement/spectator, and player-state synchronization paths.

Context: OpenTibiaBR needed a livestream/cast viewer flow that crossed the Canary server runtime and the login-server stack. The feature had to expose active casts to clients through a normal client-compatible login path while preserving game-state safety.

Problem: Viewer sessions needed to be read-only, isolated from player actions, represented in login descriptors, and compatible with client expectations without turning spectators into normal game participants.

Solution: Implemented livestream manager behavior in Canary, viewer restrictions, Lua command integration, persistence/runtime support, and matching login flow support in login-server.

Impact: Demonstrated multi-repo ownership across runtime behavior, protocol/login descriptors, persistence, commands, and client compatibility.

Context: Market, inbox, and offline-save flows need strong item and persistence invariants. Small mistakes can duplicate items, lose items, or overwrite valid player progression.

Problem: Full inboxes, stack splitting, partial insertions, market clone behavior, and partial offline-player saves had edge cases where mutation order could corrupt state.

Solution: Hardened inbox and market insertion paths with capacity checks, safer cloning/insertion behavior, batch insertion helpers, and offline save protections.

Impact: Reduced risk of duplicated/ghost items, item loss, and progression resets in economy and persistence flows.

Context: New users and maintainers need a reproducible local stack, and CI needs to catch runtime startup failures.

Problem: Build success alone did not prove that the server could start with database, config, map data, login-server, and MyAAC account tooling integration.

Solution: Built a local stack with MariaDB, Canary runtime image, MyAAC account tooling, login-server, startup scripts, LAN mode, and runtime smoke tests.

Impact: Improved developer onboarding and increased confidence in runtime startup behavior.

Context: Client delivery needed to support modern asset sets, server-specific modules, public launcher downloads, catalog visibility, operational monitoring, and update metadata without exposing private implementation details.

Problem: Partner client distribution was not a single-download problem. Different servers needed different asset trees, module sets, launch goals, update cadence, news, monitoring, and delivery rules while preserving one controlled public entry point.

Solution: Integrated client asset automation, launcher/API delivery flows, server-specific asset/module loading, partner catalog rules, admin asset monitoring, news APIs, HTTPS monitoring, signed metadata, and release support.

Impact: Gives players and operators a controlled public download/update path while preserving separation between server-specific packages and confidential partner operations.

Context: Remere's Map Editor is a long-lived C++ desktop tool used to inspect, edit, load, save, render, and export large map/client-asset data sets.

Problem: Large-map workflows were paying too much allocation, traversal, binary I/O, save-path, repaint-invalidation, and generated asset export cost.

Solution: Added pooled allocation, cached floor/tile lookups, improved binary I/O, optimized save traversal, reduced unnecessary repaint work, and added large map asset export support.

Impact: Public PR metrics report slab refills dropping from 17,830 to 2,230, allocation CPU share dropping from 20.01% to 14.62%, and static viewport sampled CPU dropping from 139,767 to 126.