08/19/2026 updated
100 % available
Senior Software Engineer | JavaScript, Python, Java, Go | AI LLM, RAG, AI Agent | Cloud Architect
Podilsk, Ukraine
Only remote
BA Computer ScienceAbout me
Senior software engineer with around 8 years building products across FinTech, e-commerce, and AdTech. Works end to end with JavaScript and TypeScript, Python, and Go, with recent work spanning LLM and agent features. Strong with AWS infrastructure and data engineering.
AI AgentsRAGGitHub ActionsTailwind CSSOpenAILangChainHTMLJava (Programming Language)JavaScriptApplication Programming Interfaces (APIs)Apache AirflowAmazon Web ServicesAmazon CloudfrontCascading Style Sheets (CSS)Cloud Engineering
Senior full-stack engineer with around 8 years building products across Healthcare, FinTech, e-commerce, and AdTech. Works end to end with JavaScript and TypeScript, Python, and Go, with recent work spanning LLM and agent features on OpenAI and Anthropic Claude and large-scale advertising and payments systems on AWS. Strong with AWS infrastructure and data engineering and known for taking systems from a rough idea to production while keeping them fast, reliable, and cheap to run.
Languages: JavaScript, TypeScript, Python, Go, Java, SQL
Frontend: React, Next.js, Redux, Tailwind CSS, HTML/CSS
Backend: Node.js, FastAPI, Express, Go (Gin), GraphQL, REST, microservices
Integrations: Amazon Advertising API (Sponsored Products / Brands / Display), Amazon Selling Partner API (SP-API), Walmart Connect, REST and GraphQL APIs, webhooks
AI / LLM: OpenAI API, Anthropic Claude, retrieval-augmented generation (RAG), LangChain, vector databases (pgvector, OpenSearch, Pinecone), prompt engineering, agent orchestration
Cloud & DevOps: AWS (ECS, Lambda, EC2, S3, Athena, RDS, DynamoDB, ElastiCache, SQS, EventBridge, API Gateway, CloudFront), Docker, Terraform, GitHub Actions, CI/CD
Data Engineering: Airflow, dbt, Snowflake, Spark, Kafka, ETL/ELT, PostgreSQL, Redis
Practices: System design, distributed systems, observability (Datadog), Agile/Scrum, mentoring
Experience
Professional experience5 - 10 years
Freelancer since2019
Languages
EnglishFluentUkrainianNative speaker
Project history
- Involved the development of a robust Auditing Web Application using a modern tech stack including C#, ASP.NET, and ABP.io, ensuring high scalability and maintainability
- Optimized performance by streamlining backend processes and database queries, reducing response times by 25%
- Designed and implemented RESTful APIs to streamline data exchange between the application and client systems, achieving a 30% improvement in response times
- Collaborated closely with cross-functional teams to gather requirements, ensuring the application met client needs and industry auditing standards
- Debugged and resolved complex issues, achieving a 95% bug resolution rate and increasing system stability
- Led architecture, design and development of 30+ web apps with React, Angular, Vue.js Stack
- Developed and maintained robust microservices using JavaScript and Python, following best practices such as TDD and CI/CD
- Developed and deployed RESTful APIs using AWS Lambda and API Gateway, ensured continuous integration and delivery (CI/CD) using AWS, used other AWS services
- Reduced deployment time from 7 hours to 50 minutes by building 14 tools to automate deployment processes using Jenkins Pipelines and Kubernetes Jobs
- Implemented Apache Kafka for real-time data processing and to facilitate communication between microservices, ensuring high throughput and low latency
- Wrote frontend code and backend code, integrated 4+ with frameworks and APIs, and utilized multiple CLI tools and configuration GUI’s
- Assisted in requirements analysis, High Level Design, Low Level Design, and complex code development with Golang, TypeScript and React for 20+ applications
- Utilized and implemented 17+ attractive, responsive, and mobile-friendly website contexts and elements using TailwindCSS and Material UI
- Maintained high-performing, scalable applications using Golang and JavaScript, ensuring best practices and design patterns for optimal performance
- Worked extensively with Golang’s modules, to build comprehensive applications with features like REST APIs, data access, and authentication
- Collaborated with external programmers to coordinate delivery of 6 new software applications