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Location: Harrisonburg, VA
Email: dandanilyuk@gmail.com

Full Stack Software Developer

Ruby on Rails · AWS · AI / Agentic Workflows

Full Stack Software Developer with 8+ years building back-end systems and scalable Ruby on Rails applications. Specialize in simplifying complex workflows through software design, automation, and AI-augmented tooling (LLMs, RAG, agentic workflows with Claude, OpenAI, MCP). Proven across startup, healthcare, and DoD environments.

Skills

  • Languages: Ruby, Python, SQL, Bash, JavaScript, TypeScript, C (maintenance), HTML/HAML/ERB, CSS/SASS
  • Frameworks & Libraries: Ruby on Rails, Hotwire (Turbo/Stimulus), Sidekiq, Node.js / Express
  • AI & Agentic Workflows: LLM API integration (Claude, OpenAI), agentic agent workflows, prompt engineering, RAG, Model Context Protocol (MCP), tool/function calling, AI-assisted development (Claude Code, Cursor)
  • Cloud & DevOps: AWS (EC2, S3, RDS, Lambda), Docker, Kamal, Terraform, CI/CD, GitHub Actions
  • Data & APIs: PostgreSQL, MongoDB, RESTful APIs, GraphQL, SMART on FHIR, 3rd-party API integrations
  • Testing & Practices: RSpec, Capybara, TDD/BDD, SCRUM/Agile, code review, pair programming
  • Tools: Git/GitHub, Appsignal, DataDog, Linux, scripting & automation

Experience

Data Management / Configuration Control

CACI International Inc. (Sep 2024 to Present)

  • Reduced manual operational tasks by 65% by designing and deploying Bash and Python automation across data delivery and configuration workflows.
  • Configured and maintained high-availability production systems running mission-critical software, conducting validation and performance testing aligned with operational requirements.
  • Maintained legacy C applications by triaging defects, implementing bug fixes, and shipping targeted enhancements without regressions.
  • Streamlined data processing and delivery pipelines, improving throughput and accuracy of customer-facing data products.

Software Engineer

Self-Employed (Mar 2022 to Sep 2024)

  • Architected and shipped scalable Ruby on Rails applications from MVP through production deployment, with a focus on back-end logic, data modeling, API design, and AWS-backed deployment pipelines (EC2, S3, RDS).
  • Validated multiple startup ideas through rapid prototyping, market testing, and iteration using Agile practices.

Software Development Manager

Trace First Inc. (Jul 2021 to Mar 2022)

  • Led a distributed engineering team across in-office and remote time zones, owning architecture decisions, sprint planning, and code review.
  • Mentored engineers, accelerated new-hire ramp-up, and rolled out new tools and technologies to improve team velocity and code quality.

Software Engineer

CarePort, powered by WellSky (Dec 2020 to Jul 2021)

  • Built SMART on FHIR integrations connecting healthcare partners to improve patient care coordination, and integrated 3rd-party vendor products via RESTful APIs.
  • Maintained CI workflows with comprehensive unit testing and automated deployments in a remote Agile environment.

Software Engineer

Trace First Inc. (Apr 2018 to Dec 2020)

  • Developed, deployed, and maintained multiple Rails applications in production within a SCRUM environment, owning CI/Git workflows for staging and production releases on AWS.
  • Identified and re-engineered performance bottlenecks across SQL queries, computation, and image processing, measurably improving response times.
  • Integrated 3rd-party APIs and application performance monitoring (DataDog) to proactively detect production issues.

Drafting, 3D Modeling, Welding & Manufacturing

SCOPOS Hospitality Group, M.H. Eby Inc. (2012 to 2017)

  • Hands-on background reading blueprints, modeling in Autodesk Revit, and fabricating custom aluminum trailers, bringing a builder’s mindset and blueprint-to-product perspective to software engineering.

Education

Epicodus, Full-Stack Web Development (Jul 2017 to Feb 2018)

6-month immersive program covering Ruby on Rails, JavaScript, and OOP. Built production-quality applications using BDD, TDD, and pair programming.