Goleniow, Poland

Senior Backend Engineer building reliable, integration-heavy systems

I design backend platforms, APIs, and production-grade services with a sharp focus on transactional reliability, partner integrations, and delivery confidence. My work spans a large-scale UAE mobile fuel delivery platform, Keycloak-based identity flows, and DevOps-minded engineering across Azure and Terraform-managed environments.

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Positioning

Primary focus

Backend systems with operational depth

Strength

Transaction-heavy services, partner APIs, and release-safe delivery.

Edge

ENOClink MobileFuel, Keycloak integration, and Azure plus Terraform workflows.

Why this matters

I work best where reliability, integration complexity, and production ownership all matter at the same time.

Credibility

What I want recruiters and technical leads to see fast

The portfolio is intentionally narrow: backend depth, integration complexity, operations, identity, and delivery confidence.

ENOClink MobileFuel

Payments & integrations

DevOps / CI/CD / operations

Keycloak / identity integration

Ruby on Rails / backend systems

Selected work

Featured case studies

The strongest story is built around systems that needed reliability, production awareness, and clear engineering ownership.

Flagship system

ENOClink MobileFuel

A large-scale UAE mobile fuel delivery platform spanning business fleet and community fueling workflows, with public product context pointing to digital controls, broad operational coverage, and meaningful transaction volume.

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

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Security and identity

Keycloak integration

Secure identity work focused on authentication flows, environment setup, and practical integration across services.

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

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Systems ownership

Payments and integrations

Backend work around transaction-heavy services, partner APIs, and failure-aware delivery.

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

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Capabilities

A backend portfolio with platform awareness

I want the skills page to be easy to scan, but the homepage should already make the shape of the work obvious.

Backend engineering

Ruby, Ruby on Rails, API design, background jobs, transactional systems, and performance debugging.

Integrations

Payment flows, third-party APIs, partner coordination, failure handling, and environment-aware delivery.

DevOps / platform

CI/CD, release workflows, Linux operations, observability, Azure infrastructure exposure, and Terraform collaboration.

Security / identity

Keycloak, token-based auth flows, secrets/config management, permissions mapping, and secure service integration.

How I work

Pragmatic architecture, production awareness, and follow-through

The pattern across projects is consistent: reduce ambiguity, build systems that are easier to operate, and treat supportability as part of the job.

Own the full path from feature design to production support.

Keep architecture pragmatic and shaped by reliability constraints.

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

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

Contact

If you need someone strong in backend systems and delivery, start here

The easiest path is still direct contact. If the project needs ownership across code, releases, and production investigation, that is the kind of work I am aiming for.

Best for senior backend roles, integration-heavy work, platform-adjacent product engineering, or early technical hires who need delivery discipline as well as implementation speed.

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