Backend
- Java 8-21
- Kotlin
- Spring Boot
- Spring Cloud
- Spring Security
- WebFlux
- Hibernate / JPA
- Node.js
- REST
- gRPC
- OpenAPI / Swagger
Hi, I'm Tiana
Senior Full-stack Engineer & Architect
Buenos Aires, Argentina · Flexible timezone - I work in any team's schedule
I design, build, and launch production-ready systems - backend, frontend, and AI included. 18+ years of experience, including 8+ years in high-load distributed systems, fintech, and microservices architecture.
Technical Skills
- Backend: high-load microservices, event-driven and DDD architectures, 99.9% uptime targets
- Frontend: React/Next.js apps with TypeScript - dashboards, admin panels, and customer-facing UIs
- System architecture for fault-tolerant systems with capacity planning and traffic-growth modelling
- Project audit: bottleneck detection, vulnerability analysis, load-risk assessment
- AI integration: LLM APIs (OpenAI, Anthropic), RAG pipelines, Claude Code workflows, MCP servers
- External integrations: payment gateways, acquiring, credit bureaus, third-party APIs
- Every project delivered with test coverage (unit / integration / E2E / load) and full CI/CD
Frontend
- React
- Next.js
- TypeScript
- JavaScript
- Tailwind
- SSR
Data
- PostgreSQL
- MongoDB
- Redis
- Kafka
- RabbitMQ
- ClickHouse
- Elasticsearch
- TimescaleDB
- NATS
DevOps
- Kubernetes
- Docker
- Helm
- AWS / GCP
- CI/CD (GitLab / Jenkins)
- Nginx
- Vercel
AI
- OpenAI
- Anthropic Claude
- LLM APIs
- RAG
- Claude Code
- MCP
Quality
- Prometheus
- Grafana
- Loki
- Keycloak
- OAuth2 / JWT
- Testcontainers
- JUnit5
- BPMN (Camunda)
Selected Projects
End-to-end products built from scratch - architecture, backend, frontend, ML, infrastructure, and deployment. Each project delivered as a complete production-ready system.
IoT / Real-time Analytics / Fleet Management
NauticScope - Maritime Analytics Platform
End-to-end platform for commercial fleet operators. Ingests 1,000+ sensor tags per second from vessels, AIS feeds, weather, and regulatory sources; delivers ETA prediction, anomaly alerts, and fuel-optimization insights to ops teams. 33 microservices, edge-to-cloud architecture, zero data loss during connectivity drops. Built from scratch: architecture, backend, frontend, infrastructure.
KotlinSpring BootNATSTimescaleDBPostgreSQLMongoDBReactTypeScriptGo (edge agent)
Healthcare / SaaS + On-Premise / Multi-product
AssayCore - Laboratory Information System (LIMS)
Modern LIMS delivered as 4 domain products (Medical, Food, Beauty, Microbiology) on a shared core. Multi-tenant SaaS for small labs and on-premise deployment with a Tauri desktop client for isolated networks. Sample workflow from intake to signed report, instrument integrations, role-based access, audit log, and result analytics.
KotlinSpring BootHibernateReactTypeScriptMUIPostgreSQLMongoDBKafkaTauri
Fintech / Lending / Real-time Decisioning / SaaS
ScoreLine - Credit Scoring & Decision Engine
Production-grade credit scoring module for lending platforms. Real-time decisioning under 80 ms p95, pluggable rule engine, credit-bureau integrations, and idempotent payment workflows. Explainable decisions with full audit trail - every score ships with the factor breakdown regulators ask for. Dashboard for risk analysts: portfolio view, rule tuning, approval overrides.
KotlinSpring BootPostgreSQLRedisKafkaReactTypeScriptPrometheusGrafana
18+Years in Tech
8+Years High-Load Systems
50+Projects Delivered
99.9%Uptime Achieved
Full-cycle Development
I design, build, and launch production-ready systems - from architecture to frontend, backend, and AI integration. Depending on the project, I work with a trusted team (DevOps, QA, designers, and backend engineers) to ensure reliable delivery and scalability.
Full-cycle product delivery from scratch - MVP to production: architecture, backend, frontend, CI/CD, documentation, scaling roadmap - turnkey
System design for high-load and fault-tolerant systems - microservices, event-driven, DDD, CQRS; diagrams, sequence flows, data models, capacity planning
Legacy rescue and modernization - monolith → microservices, stack upgrades (Java 8→21, Spring Boot 1→3, React upgrades), test coverage from zero
Vibe-code and prototype cleanup - turn AI-generated or intern-grade code into production-ready systems with real architecture, tests, and observability
Project audit - bottleneck detection, vulnerability analysis, load-risk assessment, optimization roadmap with concrete remediation steps
Performance optimization under high load - parallel transaction handling, caching, connection pools, query tuning, hot-path profiling
Payment and fintech integrations - gateways, acquiring, credit bureaus, scoring, idempotent workflows, reconciliation
External integrations - third-party APIs, data providers, SSO, webhooks, with retry and failure-handling strategies
AI integration - LLM APIs (OpenAI, Claude), RAG pipelines, Claude Code workflows, MCP servers embedded into product flows
ML/AI integration into legacy products - contracts (input/output schemas), load testing, async scoring, fallback strategies, canary and shadow rollout - without breaking production
RAG and semantic search retrofit - bolt onto existing CMS/ERP/CRM via sidecar service, no monolith rewrite, feature extraction from old databases
AI production safety - evaluation pipelines, hallucination QA, regression suites for non-deterministic systems, rollback playbooks, monitoring and observability
AI rollout strategy - incremental adoption, A/B testing, shadow mode, automatic fallback to rule engine when model degrades or latency spikes
Test coverage - unit, integration, E2E, and load testing for existing and new projects (Testcontainers, k6, JMeter)
Observability and on-call - logging, metrics (Prometheus / Grafana / Loki), alerting, incident response, post-mortems
Ongoing support and maintenance - bug fixes, security patches, dependency updates, performance tuning, uptime monitoring
Senior engineer or tech lead on demand - freelance, contract, or full-time; code review, mentoring, team leadership
Work Experience
Integration Analytics Platform
Senior Engineer - Core Platform Architecture
- Reduced MTTR by ~30-40% with automated backup and restore via Nginx proxy (S3 storage)
- Decreased server load by ~30-50% by replacing long-polling with SSE
- Built step-by-step task execution service on Kafka (~99.9% delivery guarantee)
- Implemented chunked file upload for large updates with automated release installation
- Live cluster node editing without recreation, including docker-registry nodes
- Enhanced licensing system with core/node control and automatic SSL certificate generation
Fintech Lending Platform
Team Lead / Senior Software Engineer
- Increased scoring system throughput by 2-3x through concurrent request processing
- Reduced latency of critical operations to <80ms (Redis caching, connection pools)
- Implemented payment idempotency - eliminated duplicate and lost transactions
- Developed proxy layers for payment system and credit bureau integrations
- Set up Prometheus/Grafana metrics and alerts - reduced incidents by ~30%
- Led backend team: code reviews, mentoring, task decomposition, risk management
Agricultural B2B Marketplace
Engineering Team Lead
- Extracted microservices from Lagom monolith to Spring Boot - improved performance
- Designed architecture for new services and data models for key business domains
- Built backend facade for mobile app with caching; implemented push notifications (FCM)
- Led team: Scrum processes, sprint planning, code reviews, release management
Government Services Platform 2.0
Senior Software Engineer
- Reduced XML processing time by ~50% with streaming parsing to ArangoDB
- Increased test coverage from 30% to 80% on critical modules
- Built inter-agency queries and statistical reports; configured BPMN in Camunda
- Trained 8+ interns, reduced onboarding from 2 months to 2 weeks
Core Banking Platform
Software Engineer / Senior Java Developer
- Migrated legacy MS SQL system to PostgreSQL with data structure optimization
- Decomposed monolith into microservices, refactored god classes; test coverage from zero to 40%
- Optimized payment processing with parallel transaction handling
- Implemented double-entry bookkeeping with optimistic locking - eliminated race conditions
- Built async integrations with external services, Redis caching for reference data
Web Application Development
Software Developer
- Full-cycle web application development: requirements gathering, architecture, implementation, deployment
- Backend development with PHP, database design and optimization with MySQL
- Frontend development with JavaScript, jQuery, responsive layouts, cross-browser compatibility
- Server administration, deployment automation, domain and hosting management
Education & Certifications
Software Engineering
TUSUR - Tomsk State University of Control Systems and Radioelectronics
2024Download my CV
Senior Full-stack Engineer & Architect, 18+ years of experience, 8+ years in distributed systems, fintech, microservices.
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