Serhii

SERHII MYTNYK
SOFTWARE ENGINEER
Ivano-Frankivsk, Ukraine
Email: [відкрити контакти](див. вище в блоці «контактна інформація»)
Telegram: @mserj15

PROFILE SUMMARY
Software engineer with over six years of experience building reliable, user-focused web applications of
varying complexity. Proactive, detail-oriented, and comfortable tackling complex technical challenges,
with a strong focus on delivering high-quality solutions that support business goals and user success.

SKILLS
JavaScript Jenkins Claude Code HTML
NGXS LangChain Angular (v2-19) Salesforce
LangGraph RxJS Canvas AI Agents
BEM SOQL Multi-Agent Systems Agile
Python RAG TypeScript Docker
Prompt Engineering CSS/Sass Rest APIs Function Calling
Angular Material Git, GitLab Vector Databases Npm
OOP Embeddings Bootstrap AWS

EDUCATION
Master degree
National Technical University of Oil And Gas
2010 – 2015

LANGUAGES
Ukrainian - Native, English - B2

WORK EXPERIENCE
Earth Elements
Apr 2021 – Now

Earth elements deliver the highest quality interior home finishes from suppliers around the world to
clients in the northwestern region of the United States. Earth elements are changing the way home
buyers, builders, architects, designers, and vendors do business.

• Modify and maintain existing systems for adaptation to business, and / or technology changes.
• Migrated an application developed in AngularJS to Angular 12.
• Working with Angular 12-19 to develop single page applications, worked with NGXS for managing
Angular applications.
• Developed the application using Agile Scrum methodology by breaking down the project to several
sprints.
• Developed AI-powered agentic workflows using Claude Code, LangChain, and LangGraph for
application automation.
• Designed retrieval and tool-execution agents with MCP (Model Context Protocol), function calling,
structured outputs, and external REST API integrations.
• Implemented RAG over document-based knowledge using embeddings and a vector database to
improve response relevance, grounding, and workflow consistency.

Environment: Angular, Python, AWS, SalesForce, Apex, SOQL, RxJS, REST APIs, NGXS, Moment,
NPM, Agile, LangChain, LangGraph, RAG, Prompt Engineering, n8n.

Best Business
Feb 2020 – Apr 2021

Contributed to frontend development of an Angular-based web platform. Combined modern UX
practices, reusable components, and responsive UI patterns to create an intuitive and efficient user
experience.

• Developed user interfaces with HTML5, CSS3, JavaScript, Angular, and JSON-based data.
• Created reusable templates and stylesheets based on UI standards, specifications, and wireframes.
• Debugged JavaScript with Chrome DevTools and resolved UI issues.
• Collaborated with interface design architects to meet accessibility standards at the code level.
• Worked within a Scrum delivery process.

Environment: Angular, JavaScript, BEM, Figma, JSON, REST APIs, Canvas, Bootstrap

CORE EXPERTISE

Angular Application Development: Building and upgrading Angular applications with Angular CLI,
reusable components, complex reactive and template-driven forms, routing, guards, resolvers, directives,
and pipes.

Architecture & State Management: Designing predictable application state with NGXS and Redux
patterns, and integrating REST APIs with HttpClient and RxJS.

Performance & Modernization: Applying lazy loading, OnPush change detection, AOT compilation, and
Angular migration best practices.

AI-Assisted Engineering: Using Claude Code and prompt engineering to accelerate implementation,
refactoring, debugging, and code-quality improvements.

Agentic AI & Integrations: Building LangChain and LangGraph workflows with retrieval and
tool-execution agents, function calling, structured outputs, MCP, and external REST API integrations.

RAG & Knowledge Retrieval: Implementing embedding pipelines and vector-database retrieval over
document-based knowledge to produce more relevant, grounded responses.