Senior backend engineer / founder

ARBITArkadiusz Poczobut

Senior Backend Engineer building production systems that scale: Ruby on Rails, integrations, DevOps.

Now

LocationGoleniow, Poland
AvailabilityOpen to offers
FounderRenewGrid.io
FOCUSPlatform Engineering
PRODUCTRenewal SaaS
YEAR2026
VERSION3.1.0
Founder of RenewGrid.io
ENOClink MobileFuel
Payments & integrations
DevOps / CI/CD / operations
Keycloak / identity integration
Ruby on Rails / backend systems

Selected work

Featured projects

ENOClink MobileFuel

Challenge: Coordinate transactional workflows, service boundaries, and frequent releases across a platform tied to real-world fuel delivery operations.

Contribution: Delivered backend features, supported production investigations, improved delivery workflows, and worked in an Azure environment with infrastructure managed through Terraform.

  • Ruby on Rails
  • PostgreSQL
  • Redis
  • Azure
  • Terraform
  • CI/CD
View project

RenewGrid.io

Challenge: Turn scattered renewal spreadsheets, evidence, owners, reminders, and internal readiness checks into a production-ready SaaS workflow.

Contribution: Founded and built the product across Rails API, Next.js web, billing, CSV import/export, evidence workflows, ops tooling, object storage, and production deployment planning.

  • Ruby on Rails
  • Next.js
  • PostgreSQL
  • Redis
  • Stripe
  • Docker
  • AWS S3
  • OVH VPS
View project

Keycloak integration

Challenge: Align application behavior, token handling, and permission mapping without turning auth into an operational burden.

Contribution: Implemented and troubleshot auth flows, configuration, and secure service integration with attention to session and role behavior.

  • Keycloak
  • OAuth2/OIDC
  • Roles & permissions
  • Secrets
  • Environment config
View project

Payments and integrations

Challenge: Keep business workflows dependable while external dependencies, callbacks, and edge cases stay in motion.

Contribution: Designed APIs, handled integration contracts, improved observability, and debugged production issues under real constraints.

  • APIs
  • Webhooks
  • Reliability
  • Testing
  • Observability
View project

Capabilities

Skills snapshot

Backend

  • Ruby on Rails
  • API design
  • RESTful services
  • Background jobs
  • Database optimization
  • Caching strategies

DevOps & Platform

  • Azure cloud
  • Terraform IaC
  • Docker containers
  • CI/CD pipelines
  • Monitoring & logging
  • Zero-downtime deploys

Security & Identity

  • Keycloak SSO
  • OIDC/SAML
  • OAuth 2.0
  • User federation
  • Custom claims
  • Identity providers

Quality & Process

  • Test automation
  • Code review
  • Documentation
  • Incident response
  • Performance tuning
  • Team collaboration

Principles

How I work

01

Backend engineering

Own the full path from feature design to production support.

02

Integrations

Keep architecture pragmatic and shaped by reliability constraints.

03

DevOps / platform

Treat observability, deployment safety, and incident response as product work.

04

Security / identity

Work well across engineering, QA, operations, and product stakeholders.

Get in touch

Looking for a senior backend engineer who ships production systems? Let's talk about your needs.