Sergiy P
Remote Backend Developer at WunderGraph
Ukraine
Summary
🤩
Rockstar🎓
Top SchoolSergiy P is a seasoned backend developer from Ukraine with 11 years of experience building and hardening API gateways and backend-for-frontend systems. He has contributed to notable open-source projects like Tyk and WunderGraph, focusing on GraphQL and API stability—improving introspection, OAuth secret handling, and request complexity optimizations to boost performance and security. Comfortable across full-stack responsibilities, Sergiy combines pragmatic refactors with low-allocation, high-performance Go implementations. His career spans remote and product roles since 2016, reflecting an ability to deliver reliable server-side features in distributed teams. An uncommon strength is his attention to subtle correctness issues (e.g., variable swallowing and empty-value handling) that prevent latent bugs in production APIs.
11 years of coding experience
8 years of employment as a software developer
Associate's degree, Software Development for automated systems, Associate's degree, Software Development for automated systems at Kharkiv Radio Engineering CollegeMaster's degree, Analyst of computer software and multimedia, Master's degree, Analyst of computer software and multimedia at Kharkiv National University of Radio Electronics
Ukrainian, English
Github Skills (24)
api-management10
reverse-proxy10
apidoc10
testing10
wpgraphql10
go10
api10
api-gateway10
performance-optimization10
wordpress-graphql10
graphql10
json-schema9
authentication9
apim9
user-authentication9
Programming languages (5)
Github contributions (5)
wundergraph/graphql-go-tools
Jan 2020 - Jan 2023
GraphQL Router / API Gateway framework written in Golang, focussing on correctness, extensibility, and high-performance. Supports Federation v1 & v2, Subscriptions & more.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 165 reviews, 267 commits in 3 years
Contributions summary:Sergiy primarily focused on optimizing the GraphQL-go-tools library's operation complexity analysis. They refactored the field depth calculation, including renaming and adjusting calculations to improve performance by removing unnecessary allocations. Additionally, the user improved the codebase with bug fixes and minor refactors in the graphql request and test files.
linterast-transformationintrospection-queryastparser
TykTechnologies/tyk
Jun 2020 - Dec 2021
Tyk Open Source API Gateway written in Go, supporting REST, GraphQL, TCP and gRPC protocols
Role in this project:Back-end Developer
Back-end DeveloperContributions:63 reviews, 74 commits, 78 PRs in 1 year 6 months
Contributions summary:Sergiy contributed to the Tyk API Gateway, focusing on backend functionalities. They implemented changes to the GraphQL API, including handling empty values in the JSON schema and enhancing introspection capabilities. Further work involved preserving OAuth client secrets during updates, and removing a variable swallowing issue in the API key handling, and fixing tests. These changes indicate a focus on API functionality, security, and improving overall stability and performance.
api-gatewaygrpcreverse-proxyapi-managementcloudnative
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