-- years of experience are counted from the jobs in used_at;

-- projects link to public GitHub repositories

return {

languages = {

ruby = {

experience = "11 years",

frameworks = { "Ruby on Rails", "Hotwire (Turbo, Stimulus)", "Grape" },

mobile = { "Hotwire Native" },

data = { "ActiveRecord", "Mongoid" },

background_jobs = { "Sidekiq", "Solid Queue" },

auth = { "Devise", "OmniAuth", "Pundit" },

testing = { "RSpec", "Capybara", "FactoryBot" },

tooling = { "RuboCop", "Capistrano" },

used_at = { "relaxify-ai", "sibsutis", "yufu", "kerweb", "upwork", "nightwatch", "parcelbright" },

projects = { "process_chain", "grape_crud" },

},

javascript = {

experience = "13+ years",

dialects = { "TypeScript", "JavaScript" },

frontend = { "React", "Next.js", "EmberJS", "TanStack", "TailwindCSS", "Storybook" },

backend = { "Node.js", "NestJS", "Express", "hapi", "Bun" },

data = { "Prisma", "Drizzle", "TypeORM", "Zod" },

testing = { "Jest", "Vitest", "Playwright", "Mocha" },

build = { "Vite", "Turborepo" },

used_at = { "upfirst", "relaxify-ai", "tradelanes", "yufu", "kerweb", "nightwatch" },

projects = { "termwire", "event-craft" },

},

elixir = {

experience = "4 years",

frameworks = { "Phoenix", "LiveView", "Ecto" },

used_at = { "yufu" },

},

go = {

experience = "maintenance and bug fixes of an open-source telecom billing system",

used_at = { "yufu" },

projects = { "cgrates" },

},

python = {

experience = "scientific computing; taught as part of the Math Statistics course",

libraries = { "NumPy", "pandas", "pytest" },

used_at = { "sibsutis" },

},

r = {

experience = "scientific computing; taught as part of the Math Statistics course",

used_at = { "sibsutis" },

},

},

architecture = {

styles = { "microservices", "serverless", "distributed systems" },

event_driven = {

experience = "5 years",

patterns = { "event sourcing", "CQRS", "projections", "pub/sub" },

messaging = { "Kafka", "AWS SQS", "AWS SNS" },

event_stores = { "DynamoDB" },

used_at = { "tradelanes" },

projects = { "event-craft", "aws-cdk-es-cqrs-demo" },

},

apis = { "REST", "JSON:API", "GraphQL" },

domain = { "domain modeling", "railway-oriented programming" },

},

ai = {

experience = "2+ years",

building = { "LLM agents for CBT and emotional support", "agent coordination", "real-time voice agents" },

sdks = { "OpenAI API", "OpenAI Realtime", "OpenAI Agents SDK", "Gemini API", "ElevenLabs", "RubyLLM" },

coding_agents = { "Claude Code", "OpenCode" },

used_at = { "upfirst", "relaxify-ai" },

projects = { "call-processor" },

},

databases = {

sql = { "PostgreSQL", "MySQL" },

nosql = { "MongoDB", "DynamoDB", "Redis" },

},

cloud = {

gcp = { "Pub/Sub", "Cloud Tasks", "Cloud SQL", "Cloud Storage" },

aws = { "Lambda", "AppSync", "API Gateway", "S3", "Cognito" },

infrastructure_as_code = { "Pulumi", "AWS CDK" },

platforms = { "Docker", "Vercel" },

observability = { "OpenTelemetry", "Sentry", "Datadog" },

},

leadership = {

experience = "11 years",

practices = { "team lead", "mentoring", "code review", "coding standards" },

teaching = { "Ruby on Rails", "Probability Theory and Math Statistics" },

used_at = { "relaxify-ai", "tradelanes", "yufu", "kerweb" },

},

}