Hi, I'm Kirill
Senior Java / Kotlin Backend Developer
I build and operate distributed microservices for fintech on the Spring ecosystem — reactive WebFlux/R2DBC, event-driven Kafka pipelines, and Kubernetes deployments. Focused on correctness, idempotency, and performance.
About me
Java/Kotlin backend developer with 6+ years of commercial experience, ~4.5 of them in fintech. I build and operate distributed microservices on the Spring ecosystem: reactive WebFlux/R2DBC, event-driven processing with Kafka, and Kubernetes-based deployments — most recently the Wildberries installment-lending platform. I focus on correctness, idempotency of financial operations, reliable third-party integrations, and query/performance optimization, and I am comfortable using modern AI tooling in my workflow.
Backend Development
DevOps & Infrastructure
Skills & Technologies
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Frameworks
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Databases
Other
Spoken languages
Experience
Senior Java / Kotlin Backend Developer
Wildberries Installment Platform
Remote
- Backend for installment purchases offered through Wildberries (client: a microfinance organization). End-to-end flow: application intake from Wildberries → data enrichment (DaData: address/identity) → scoring orchestration with the MFO → approval decisions and overdue-payment handling.
- Designed and owned several of the platform's ~10 microservices (application handling, data enrichment, payments): reactive Kotlin (Spring WebFlux, R2DBC/PostgreSQL), Kafka, Redis, RSocket between services behind an API gateway; Kubernetes (Yandex Cloud).
Tech stack:
Senior Java / Kotlin Backend Developer
Orbsoft
Remote
- Debit-card issuance and payments (Maps.me); cargo-insurance platform (underwriting, bulk policy issuance up to 10K records via Excel, PDF generation).
- Authored internal Spring starters (request logging, distributed tracing, data masking, S3) reused across the service fleet; GitLab CI/CD and Helm deploys; observability via OpenTelemetry, Prometheus, Grafana.
- Migrated inter-service calls from gRPC to RSocket, removing protobuf-mapping overhead.
- Optimized hot endpoints (~2–3×): query-plan analysis, indexing, offset→keyset pagination, Redis caching, and PostgreSQL tuning.
- Code review and mentoring of 2 junior developers.
Tech stack:
Java Developer
Indas Holding
Novokuznetsk, Russia
- Server software for industrial telemetry over MQTT (event-driven); PostgreSQL schema with indexing under load.
- Spring Security (role-based access, JWT); versioned REST APIs.
- Trained an ML model for rail-car number recognition on a proprietary dataset (image preprocessing, Hadoop/Spark), integrated with the backend.
Tech stack:
Full-stack Java Developer
Sibir-Soft (SSP)
Novokuznetsk, Russia
- Full-stack development for a closed module of a state procurement platform (zakupki.gov.ru): delivered new features per specification and resolved defects across backend and frontend.
- Backend: Java, JPA, REST APIs, PostgreSQL, schema migrations (Liquibase), deployment on JBoss. Frontend: Angular.
Tech stack:
Projects
Wildberries Installment Platform
Backend for installment purchases offered through Wildberries (client: a microfinance organization). End-to-end flow from application intake and DaData enrichment to scoring orchestration, approval decisions, and overdue-payment handling — several of ~10 reactive microservices.
Card Issuing & Processing (Maps.me)
Debit-card issuance and payments: card lifecycle, transaction processing, and integrations with processing centers.
Cargo Insurance Platform
Underwriting automation and bulk policy issuance (Excel import up to 10K records), premium calculation, and PDF policy generation.
Education
Bachelor — Informatics and Computer Engineering
Kemerovo State University (Novokuznetsk Institute)
2019
Get in touch
I reply within 24 hours. On Telegram I usually respond faster.
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