Дмитро

Dmytro Blyndov
Java / Spring Boot Developer
[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | @graf_crayt | Kyiv, Ukraine (Remote)

SUMMARY

Java / Spring Boot Developer with commercial backend modernization experience since 2023 and strong
Java/Spring project delivery under the Swaga Solutions umbrella.
Experienced in migrating legacy Java/Spring services to modern Java runtimes, updating dependencies,
fixing compatibility issues and validating existing API and persistence behavior. Owns backend
architecture decisions across Swaga Solutions projects and uses Codex/AI as an engineering accelerator
through specifications, review, tests and integration control.

SKILLS
Languages & Frameworks Testing & Quality
Java, SQL, Spring Boot, Spring Web, Spring Data JUnit 5, Spring Boot Test, Testcontainers, Mockito,
JPA, Spring Data MongoDB, Spring Security, Awaitility, GreenMail, Playwright, CI verification
Validation, Actuator
Databases Infrastructure
PostgreSQL, MongoDB, JPA/Hibernate, Flyway, Docker, Docker Compose, Nginx, LocalStack, S3,
Liquibase, JSONB SQS, GitHub Actions, Maven, Gradle
Security Frontend & AI Workflow
JWT, OAuth 2.0/OIDC, Keycloak, sessions, roles, React, TypeScript, Vite, TanStack Query,
account lifecycle Codex-assisted development, Spec-Driven
Development

PROFESSIONAL EXPERIENCE
Confidential NDA Projects, Java Backend Developer 01/2023 - 12/2025 | Ukraine (Remote)
Java Services Modernization
Worked on separate NDA-backed backend modernization projects for confidential Java/Spring services. The
main focus was migrating services to modern Java runtimes, stabilizing dependency trees and keeping
existing API and persistence behavior compatible after upgrades.
- Migrated 8 Java/Spring services from Java 11, Java 14 and Java 17 to Java 21; additionally migrated one
service from Java 17 to Java 24.
- Updated dependencies to the latest compatible versions available for each target Java runtime, reconfigured
affected libraries and replaced outdated dependencies where older libraries had been consolidated into
newer alternatives.
- Resolved compilation/runtime issues, deprecated API usage, Maven/Gradle configuration problems and
library incompatibilities introduced by the runtime upgrades.
- Verified backward compatibility of existing REST APIs and persistence logic after migration through local
checks, CI flows and regression fixes.
- Worked under NDA; client, domain and internal service details are not disclosed.

Technological Stack: Java 11/14/17/21/24, Spring Boot, Maven, Gradle, REST API, SQL, Git, automated
testing, CI

SWAGA SOLUTIONS PROJECTS
Swaga Solutions, Java / Spring Boot Developer 2026 - Present | Ukraine (Remote)
Java/Spring projects delivered under the Swaga Solutions umbrella, focused on backend architecture,
production-like environments, authentication, data processing, testing and AI-assisted delivery.

Holotable.gg / SWGOH AI Strategy Assistant, 05/2026 - Present | Private implementation
Architecture Owner
Holotable.gg is an AI-first strategy assistant for Star Wars: Galaxy of Heroes players and guilds. The product
combines deterministic backend analysis, verified game data, AI explanations and progression planning.
- Defined the target architecture after the POC and moved further development to a Spec-Driven
Development workflow: approved specification -> implementation -> tests -> verification.
- Built a production-like local stack with React frontend, 2 Spring Boot backend services, PostgreSQL,
Keycloak, Nginx and Comlink-compatible data integration.
- Implemented backend components for static game-data import, catalog APIs, account lifecycle, sessions,
administration and protected flows.
- Separated the AI-facing strategy layer from deterministic backend facts so the LLM explains verified
readiness/gap/blocker data instead of inventing game facts.
- The frontend was generated 100% with Codex/AI under my technical direction, review, integration control
and acceptance testing.
Technological Stack: Java, Spring Boot, Spring Security, PostgreSQL, Keycloak, Docker Compose, Nginx,
REST API, React, Playwright, PowerShell, AI/Codex

Home Budget & Receipts Manager, Full-stack Developer 04/2026 - 05/2026 | Public project

Full-stack application for budget tracking, receipt OCR, asynchronous report generation, S3-backed
downloads and multi-channel notifications.
- Built a Java 21 / Spring Boot 3 backend with purchases, receipts, OCR, reports, notifications and JWT
authentication.
- Implemented async OCR/report processing using SQS-style queues with LocalStack and generated
downloadable reports in CSV, PDF and XLSX formats.
- Added integration tests with Testcontainers, LocalStack, GreenMail, Awaitility, frontend tests, Playwright
smoke checks and GitHub Actions CI.
Technological Stack: Java 21, Spring Boot 3, PostgreSQL, Flyway, LocalStack, S3, SQS, JWT, Docker,
React, TypeScript, Vite, Playwright, Testcontainers

EDUCATION
Game Development 2022 - 2024 | Ukraine
Incomplete higher education, 2 years completed
LANGUAGES

English: B2+ | Ukrainian: Fluent | Russian: Fluent