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

Full Stack Software Developer

Ruby on Rails · Python · AWS · AI / Agentic Workflows

Full stack software developer with 8+ years building back-end systems and scalable Ruby on Rails applications across startup, healthcare, and DoD environments. Works primarily in Ruby, Rails, scripting, and AWS, and picks up whatever other tools the job calls for. A generalist by nature who is equally happy diving deep when a problem demands it, and a firm believer in well-tested code. Motivated by shipping software that delivers real value, and brings a positive, collaborative attitude to work every day.

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 workflows, prompt engineering, RAG, Model Context Protocol (MCP), tool/function calling, AI-assisted development
  • 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)

  • Cut manual operational workload by 65% by designing and deploying Bash and Python automation across data delivery and configuration workflows.
  • Own configuration and upkeep of 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 fixes, and shipping targeted enhancements without regressions.
  • Streamlined data processing and delivery pipelines, improving the 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 end-to-end, from MVP through production, owning back-end logic, data modeling, API design, and AWS deployment pipelines (EC2, S3, RDS).
  • Validated multiple startup ideas through rapid prototyping and market testing, sharpening the instinct for building only what delivers real user value.
  • Built hands-on expertise in AI and LLM tooling by integrating Claude and OpenAI APIs, RAG pipelines, and agentic workflows into working prototypes.

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 and accelerated new-hire ramp-up, rolling out new tools and technologies that improved team velocity and code quality while keeping team morale high.

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 fully remote Agile environment.

Software Engineer

Trace First Inc. (Apr 2018 to Dec 2020)

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

Drafting, 3D Modeling, Welding & Manufacturing

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

  • Read blueprints, modeled in Autodesk Revit, and fabricated custom aluminum trailers, a hands-on background that shaped a blueprint-to-product approach to software engineering.

Education

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

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