Владислав

Vladyslav Lysak
Software Engineer · Web Integrations &
Automation

EMAIL [відкрити контакти](див. вище в блоці «контактна інформація») TELEGRAM @stfrd_s LINKEDIN /in/vladyslavlysak

LOCATION Kyiv, Ukraine LANGUAGES Ukrainian / English

About
Software engineer with 9 years of experience building marketplaces, internal tools, and integrations. My
main focus is Go backend development. I also build React interfaces and admin panels, and use
Claude Code and Codex for implementation and testing. I'm interested in custom CRM, API
integrations, and workflow automation.

Selected Projects
Studio Portal · Claude Code. Built the Go backend and React frontend for a private portal where game
studios manage organizations, games, and access. Used Claude Code to break down the work, design the
APIs, and implement the platform integration. Other services later adopted the portal's approach to defining
access rules in gRPC contracts.
Public marketplaces. Contributed mainly to backend development, with some frontend work, on DMarket
and Pulse Market. Also worked on private admin panels.

Experience
Mythical Games
Senior Software Engineer · 2023-2026 · Full-time · Remote · Startup

Mythical Marketplace and Web Store for in-game assets, serving approximately 50K monthly active users and up
to 3 million registered accounts.

Primary Sales. Owned backend delivery for limited-run Web Store pack sales, from planning and
delegating work through launch. Built the Temporal purchase workflow and designed a service to enforce
per-user limits. The feature generated thousands of dollars in its first month and was later adapted for the
next platform generation.
Marketplace transactions. Designed recovery from partial failures using retries, idempotency, and
compensation in Temporal Sagas. Prepared smart-contract inputs in the workflows and passed them over
gRPC to downstream signing and execution services.
Kafka event ordering. Traced out-of-order asset events to the partition key and rebuilt it from contract and
token IDs. Restored ordering per asset while keeping unrelated assets in parallel. Idempotent consumers
handled at-least-once delivery.
Reliability and access control. Added webhook circuit breakers to prevent cascading overload. Extended
Kong with Lua plugins for JWT authentication and rate limiting, and implemented OAuth2 for Go admin
services.
Production ownership. Defined API contracts with frontend engineers and failure scenarios with QA.
Owned service-level CI/CD and deployment configuration. Remained code owner after rollout and traced
incidents across services, databases, and queues.

Technical Expertise
BACKEND & APIS Go · REST · gRPC · Webhooks · OAuth2 · Temporal
FRONTEND React · JavaScript · HTML · CSS
DATA & DELIVERY PostgreSQL · MongoDB · Redis · Docker · Kubernetes · CI/CD

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Experience
DMarket
Backend Engineer · 2019-2023 · Full-time · Kyiv · On-site / Remote · Startup

Digital-item marketplace with approximately 7 million registered accounts.
OWNERSHIP

Designed and tested API changes, coordinated Kubernetes rollouts with consuming teams and DevOps,
and investigated incidents and drove fixes on call.
Authentication at scale. Cut redundant authentication requests in critical transaction flows by
approximately 50% by passing validated user context between services. The central JWT authentication
service handled 5-7K requests per second.
Account security and API access. Responded to brute-force login attempts with authenticator app 2FA
and email verification for unfamiliar IPs, using short-lived Redis state. Added API-key access for Trading API
clients and Kong authorization for administration services.
Trading Subscription. Built backend flows rewarding subscribers with cashback based on marketplace
activity, supporting a recurring revenue stream.
Service modernization and worker coordination. Migrated services from go-micro to native gRPC while
preserving behavior. Added Redis-backed leader election to prevent duplicate execution of singleton jobs.
Price recommendations. Built background workers that aggregated market analytics from external
providers within provider-specific rate limits, calculated recommendations asynchronously, and persisted
precomputed results for user-facing APIs.

dabidab
Full Stack Developer · 2017-2019 · Remote · Startup

ParkMo, a platform for sharing and reserving parking spaces.
OWNERSHIP

Full-stack ownership. Owned implementation, deployment, and production support as the engineer on a
two-person team with the CEO. Used ELK and Sentry to investigate incidents.
Booking and visualization. Built availability and reservation logic and an interactive floor view based on the
parking-space model.
Identity, delivery, and infrastructure. Integrated sign-in via Ory Hydra (OAuth2/OIDC). Automated Docker
builds and deployments with GitLab CI/CD and managed cloud VMs with Ansible.

AI-Assisted Engineering
Delivery and review. Used coding agents such as Claude Code and Codex to clarify requirements, break
down tasks, design APIs, and implement changes. Reviewed implementation choices and used targeted
tests to verify Go service behavior.
LLM Wiki. Maintained a knowledge base of design decisions and engineering standards covering Go
service structure, API contracts, and testing. Used it to give coding agents the relevant guidance before
they made changes and carry decisions forward between sessions.

Education
Volodymyr Dahl East Ukrainian National University
Master’s in Information Technology · 2019-2021
Bachelor’s in Computer Science and Information Technology · 2015-2019

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