Senior Software Engineer Java / Backend & AI Solutions

Sergei Litvinov

Danville, CA ***** 925-***-**** **.*********@*****.*** LinkedIn

Professional Summary

Senior Software Engineer with 13+ years of experience designing and building scalable, distributed backend systems and APIs. Strong expertise in Java (Spring Boot, microservices architecture), with additional experience in Python and Node.js for data processing and integrations. Proven track record of delivering high-performance, resilient services, optimizing database performance, and leading system migrations. Experienced in integrating LLMs (OpenAI, Anthropic Claude) into backend pipelines using prompt engineering and human-in-the-loop validation to improve risk detection and automate workflows. Skilled in cloud-native development, CI/CD, and mentoring engineers while driving technical excellence in SaaS platforms. Authorized to work for any U.S. employer (Green Card Holder). Professional Experience

Silq Finance Sep 2023 - Present

Senior Software Engineer San Francisco, CA

• Delivered end-to-end features across React and Spring Boot for a SaaS financial platform - boosting transaction throughput by 15%, maintaining rigorous test coverage, and mentoring two junior engineers through code reviews and pairing sessions.

• Built an LLM-powered fraud detection pipeline (OpenAI + Anthropic Claude) with concurrent Java processing, prompt engineering, and human-in-the-loop review - improving risk assessment accuracy by 25%.

• Adopted AI-assisted development workflows with Claude Code, Cursor, and GitHub Copilot, building reusable prompt templates and structured prompts that accelerated feature delivery and improved code-review quality across the team.

• Developed backend services for investor verification and transaction reconciliation by integrating third-party REST APIs, reducing manual reconciliation time by 20% and ensuring reliability through targeted test coverage.

• Deployed microservices on AWS-managed Kubernetes (EKS) clusters using Helm charts and GitOps, building an automated CI/CD pipeline that delivered consistent releases and eliminated deployment errors.

• Instrumented distributed services with Prometheus and Grafana for proactive incident response and systematic performance testing, reducing downtime by 15%.

• Upgraded the React-based investor dashboard with personalized data visualizations, growing user engagement by 20% and supporting end-to-end testing across customer-facing workflows. ZeroAvia Feb 2023 - Sep 2023

Senior Software Engineer Hollister, CA

• Developed Python-based backend services and real-time monitoring tools with predictive analytics and AI/ML model integration, doubling system performance and reducing equipment downtime by 15%.

• Migrated the manufacturing tracking system from Oracle to PostgreSQL by leading relational database design, cutting query time by 35% and validating data integrity with comprehensive backend tests.

• Optimized supply-chain operations with machine-learning forecasting models in Python and SQL, integrated into a JUnit-tested CI pipeline, lowering maintenance costs by 20% and improving overall system reliability. MTS Digital Nov 2020 - Jan 2023

Senior Software Engineer Moscow, Russia

• Led the development of a distributed fraud-analysis platform using Java, MariaDB, and Kafka, improving scalability by 60% across high-throughput services.

• Migrated legacy monolithic applications to a Dockerized microservices architecture orchestrated by Kubernetes, reducing deployment errors and improving fault isolation.

• Configured Istio service mesh to secure service-to-service communication, enable traffic routing, and provide observability across distributed systems.

• Designed Jenkins + Helm CI/CD pipelines for automated builds, testing, and deployment to Kubernetes clusters, reducing release cycle time and ensuring consistent deployments.

• Mentored junior developers through training and structured code reviews, increasing team onboarding efficiency by 25%. NetCracker Technology Corp Mar 2016 - Nov 2020

Senior Software Engineer Moscow, Russia

• Refactored a monolithic application into independent Spring Boot microservices, deployed with Kubernetes and Helm and integrated into a Git-based CI/CD pipeline, improving deployment speed and system scalability.

• Developed business logic and RESTful APIs that reduced manual processes by 40% and supported customer-facing workflows.

• Collaborated cross-functionally with QA to enhance testing strategies, decreasing production defects by 30%.

• Managed Kubernetes configurations, namespaces, secrets, and ingress controllers with Helm, resulting in more reliable deployments and reduced configuration errors.

• Implemented centralized logging and monitoring with the ELK stack and Prometheus, shortening incident detection time and providing real-time visibility into system health. Zemsky Bank Apr 2013 - Mar 2016

Software Engineer Togliatti, Russia

• Developed cash and settlement applications using Java and Oracle, integrating with ERP systems for faster transaction processing and improved data accuracy.

• Modified banking applications to meet regulatory requirements, reducing compliance issues by 20%.

• Trained staff on software solutions, cutting system-related support tickets by 25%. Avtovaz Jul 2004 - Apr 2013

Software Developer Togliatti, Russia

• Built IoT-enabled monitoring systems for factory equipment, reducing downtime by 25%.

• Optimized ERP system supply chain using JavaScript and Oracle, cutting procurement delays by 30%.

• Automated production workflows with PHP scripts stored in GitHub and deployed on LAMP, streamlining tasks and boosting operational efficiency.

Technical Skills

• Languages: Java 8+, JavaScript / TypeScript, Python, SQL, PL/SQL, Bash, HTML, CSS, XML, JSON, YAML

• AI / ML & GenAI: LLM Integration (OpenAI API, Anthropic Claude API), Prompt Engineering, Structured Prompts, AI-Assisted Development, Claude Code, Cursor, GitHub Copilot, Human-in-the-Loop Validation, Reasoning Workflows, Model Inference, AI Anomaly Detection, Predictive Analytics, Machine Learning Forecasting, Large Language Models (LLM), Retrieval-Augmented Generation (RAG)

• Backend: Spring Boot, Spring Security, JPA, Hibernate, REST APIs, Microservices, Distributed Systems, Multithreading-

, Programming Concurrency, Object-Oriented Design, Data Structures & Algorithms, Problem Solving, API Development

• Frontend: React, Angular 8+, Node.js, Next.js, ES6, ESLint, Bootstrap, jQuery, AJAX, Web Application Development

• Cloud & DevOps: AWS (EKS, EC2, S3, Lambda), Docker, Kubernetes, Helm, Kustomize, Istio, OpenShift, Jenkins, GitOps, CI/CD Pipelines, Maven, Gradle, Liquibase, Flyway, Nexus, JFrog, Prometheus, Grafana

• Databases & Data: PostgreSQL, Oracle, MariaDB, MongoDB, ClickHouse, Redis, Kafka, Elasticsearch, ELK Stack, Relational Database Design, Query Processing, ETL Workflows

• Testing & Tools: JUnit, TestNG, Selenium, Cucumber, Rest Assured, SoapUI, Postman, Fiddler, TDD, Test Automation Frameworks, Security Testing, Grafana, Prometheus, Kibana, Logstash

• Process & Leadership: Agile (Scrum, Kanban), Cross-Functional Collaboration, Code Review, Mentoring, Coaching, Git, GitHub, GitLab, SVN, Jira, Confluence, Linux, macOS

Education

Volga University Tatishchev (VUiT) Jul 2002 - Jun 2007 Master's, Computer Science (Software Engineering)

• GPA: 4.0

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