08/09/2026 updated
100 % available
Senior Full Stack Engineer | TypeScript | Node.js | PostgreSQL | React.js
Kaunas, Lithuania
Only remote
Bachelor's degree in Software Systems (Kaunas University of Technology)About me
Expert in delivering full-cycle software solutions independently. Skilled in system design, API development, database architecture, Docker, and cloud deployment (AWS, GCP). Specialize in transforming complex challenges into robust software end to end.
JavaScriptPostgreSQLNode.jsNext.jsTypeScriptDatadogGrafanaBackendFull Stack DevelopmentGraphQLFront End Software DevelopmentApi DesignRestful Api
Full Stack Development with TypeScript and Node.js
Extensive experience building high-performance backend microservices and frontend applications using TypeScript, Node.js, React.js, and Next.js, delivering scalable solutions across complex financial and consumer-facing domains.
Database Design and Query Optimization with PostgreSQL
Deep expertise in PostgreSQL, including architecting large-scale schemas, diagnosing and resolving query performance issues using Grafana latency metrics, and migrating business logic from stored procedures into clean codebases.
Cloud Infrastructure and CI/CD Pipelines
Proven ability to set up and manage cloud infrastructure on AWS and GCP using Terraform, configure CI/CD pipelines with Jenkins, GitHub Actions, and GitLab CI, and implement monitoring with DataDog and automated e2e testing.
GraphQL API Development
Experience building core product backends with GraphQL, including integration with ORY authentication and Redis caching, and shipping documented TypeScript SDKs on top of GraphQL APIs.
Machine Learning Pipeline Development with Python
Construction of inventory forecasting ML pipelines in Python using NumPy and PyCaret, achieving 80% accuracy, alongside data sync and reconciliation workflows.
React Native and Mobile Development
Delivery of user-facing functionality in React Native mobile applications, including engineering AI-powered features and migrating legacy frontend systems to modern frameworks.
Redis Caching
Utilization of Redis for caching in backend systems to improve performance and scalability of high-traffic applications.
Blockchain and Crypto Payments Integration
Development of oracle daemons pushing ticker prices to 30+ blockchains, and building backends supporting crypto payments, KYC flows, and token airdrops handling up to 500 requests per second.
Containerization and Docker
Experience with containerized deployments using Docker, including setting up containerized environments for microservices and cloud deployments.
.NET Core Microservices
Early career experience breaking monolithic backends into microservices using .NET Core, with thorough test coverage and containerized deployments to Azure.
Extensive experience building high-performance backend microservices and frontend applications using TypeScript, Node.js, React.js, and Next.js, delivering scalable solutions across complex financial and consumer-facing domains.
Database Design and Query Optimization with PostgreSQL
Deep expertise in PostgreSQL, including architecting large-scale schemas, diagnosing and resolving query performance issues using Grafana latency metrics, and migrating business logic from stored procedures into clean codebases.
Cloud Infrastructure and CI/CD Pipelines
Proven ability to set up and manage cloud infrastructure on AWS and GCP using Terraform, configure CI/CD pipelines with Jenkins, GitHub Actions, and GitLab CI, and implement monitoring with DataDog and automated e2e testing.
GraphQL API Development
Experience building core product backends with GraphQL, including integration with ORY authentication and Redis caching, and shipping documented TypeScript SDKs on top of GraphQL APIs.
Machine Learning Pipeline Development with Python
Construction of inventory forecasting ML pipelines in Python using NumPy and PyCaret, achieving 80% accuracy, alongside data sync and reconciliation workflows.
React Native and Mobile Development
Delivery of user-facing functionality in React Native mobile applications, including engineering AI-powered features and migrating legacy frontend systems to modern frameworks.
Redis Caching
Utilization of Redis for caching in backend systems to improve performance and scalability of high-traffic applications.
Blockchain and Crypto Payments Integration
Development of oracle daemons pushing ticker prices to 30+ blockchains, and building backends supporting crypto payments, KYC flows, and token airdrops handling up to 500 requests per second.
Containerization and Docker
Experience with containerized deployments using Docker, including setting up containerized environments for microservices and cloud deployments.
.NET Core Microservices
Early career experience breaking monolithic backends into microservices using .NET Core, with thorough test coverage and containerized deployments to Azure.
Experience
Professional experience10+ years
Freelancer since2016
Languages
EnglishFluentRussianBasic knowledgeLithuanianNative speaker
Project history
Contributed to a full relaunch of a gold trading and crypto payments platform, migrating business logic from database stored procedures into a clean TypeScript and PostgreSQL codebase. Delivered features across ledgers, commission schemas, tiered discounts, crypto payments and country-based shipping. Diagnosed and fixed query performance issues using Grafana latency metrics. Improved delivery quality through PR reviews and GitLab CI pipelines for automated e2e testing.
Developed high-performance Node.js microservices with Fastify, TypeScript and PostgreSQL on GCP, handling 7M+ daily requests at 50ms latency. Led frontend platform migration to Next.js with Playwright and Jest coverage. Engineered AI-powered data extraction features in a Fastify backend and delivered user-facing functionality in Next.js web and React Native mobile.
Built an inventory forecasting ML pipeline in Python (NumPy, PyCaret) reaching 80% accuracy. Led Shopify app development in Remix including data sync and reconciliation. Constructed the supporting backbone on GCP with Terraform, GitHub Actions CI/CD and DataDog monitoring.