[Hiring] Software Engineer @Refinery89

Role Description

We're looking for a Software Engineer with an Agentic mindset — someone who doesn't just write code, but builds systems that think, act, and adapt. You'll work on a production AdTech platform with real business impact, and you'll increasingly work alongside AI agents and design agentic workflows as part of your daily engineering practice. This is not a ticket-execution role. We expect you to bring judgment, ask the hard questions, design thoughtfully, and genuinely care about the quality of what you ship — whether that code was written by you, assisted by AI, or executed autonomously by an agent you designed.

Responsibilities

• Design, develop, and maintain robust, scalable backend services following Domain-Driven Design (DDD) principles.
• Take full technical ownership of features — from design through deployment and monitoring.
• Build and orchestrate agentic workflows: autonomous pipelines where AI models (Claude, LLMs) take actions, call tools, and solve tasks with minimal human intervention.
• Actively participate in architecture decisions with strong analytical thinking and technical depth.
• Ensure code quality through SDD, TDD, and BDD methodologies, with sharp attention to detail.
• Collaborate on code reviews, refinements, and technical planning.
• Proactively identify and address technical debt, performance bottlenecks, and security risks (OWASP, SOLID).
• Build and maintain CI/CD pipelines across Bitbucket, GitLab, or GitHub.
• Produce well-reasoned technical designs before writing the first line of code.

Tech Stack

• Languages: PHP (required), JavaScript / Node.js, Python, Rust (nice to have)
• Frameworks & Tools: Laravel, Pest, Tailwind CSS, AWS (Lambda, SAM Templates, S3, CloudFront), Terraform, Playwright, Robot Framework, Cypress, Grafana, k6, Postman
• Agentic & AI Tooling: Claude (Anthropic), Kiro, Experience building or working with LLM-powered agents, tool use, MCP integrations, or prompt engineering at an engineering level
• Platform & Collaboration: Bitbucket, Jira / Atlassian suite, AdTech (nice to have), Google Ad Manager (GAM), Prebid.js, Prebid Server
• Methodologies & Principles: SDD (Spec-Driven Development), TDD, BDD, SOLID, DDD, OWASP, CI/CD pipelines (Bitbucket Pipelines, GitLab CI, GitHub Actions)

Qualifications

• 5+ years of experience in backend or full-stack software development.
• Practical experience with agentic AI systems — building agents, designing tool use, working with LLM APIs, or automating complex workflows with AI.
• Strong technical analysis and design skills: you can break down complex problems, propose well-reasoned solutions, and think through the implications of architectural decisions.
• Critical thinking: you don't execute blindly. You question, challenge, and improve — including the outputs of AI tools.
• Attention to detail: the code you ship is clean, tested, and documented. You apply the same standard to AI-generated code.
• True ownership: you're accountable for what you build — in production, over time.
• Autonomy: you know how to move forward without hand-holding, and when to raise a flag.
• Proactive attitude: you surface improvements, catch problems before they become incidents, and share knowledge freely.
• Eagerness to learn: the agentic era is moving fast, and you're moving with it.
• Fluent professional English, written and spoken. The team is fully remote and multicultural.

Benefits

• Full remote — work from anywhere within the European timezone (CET ±2h).
• Small, technical team with minimal overhead.
• Direct impact: your decisions ship to production.
• A culture of honest feedback and continuous improvement.
• Modern tooling — including cutting-edge AI — and freedom to propose new approaches.
• A front-row seat to the agentic engineering shift, not just as a user but as a builder.