Senior Backend Engineer (PHP, Symfony) – Fluix Team

Readdle; Warszawa; On-site; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Customer‑centric culture

Relentless growth

Exceptional people, exceptional team

Real impact

Culture of innovation

Job summary

Readdle is seeking a Senior Back-end Product Engineer who takes end-to-end ownership from problem understanding to production. You will design scalable backend services and data models for Fluix, collaborate across teams, and continuously improve through AI-enabled development and strong testing.

You will work on core backend systems for workflow automation, document processing, e-signatures, and integrations, delivering reliable product experiences for enterprise customers.

Qualifications

• 5+ years of backend engineering with end-to-end ownership of features or services.
• Strong PHP and Symfony expertise with solid API design and clean code practices.
• Hands-on AWS experience and familiarity with Kubernetes/serverless architectures.
• Proficient in JavaScript/TypeScript, Node.js, and frameworks like ExpressJS or NestJS.
• Ability to use AI daily in development and explain the value and validation.

Responsibilities

• Own features end-to-end from problem understanding to production release.
• Design scalable backend services, APIs, and data models.
• Decompose work, make architectural decisions, and present solutions.
• Refactor codebase, improve test coverage, and monitor production.
• Collaborate with Backend, Frontend, iOS, Android, and Support teams.

Skills

Backend ownership

Product-minded

AI-enabled development

CI/CD automation

System design

Debugging and profiling

Tools

PHP

Symfony

AWS

Kubernetes

Node.js/TypeScript

ExpressJS/NestJS

Xdebug/Blackfire

CI/CD pipelines

Job description

Readdle is a pioneering force in the personal productivity space on Apple devices, having shaped the landscape since 2007. Our mission is to empower individuals and teams with innovative technology, enhancing their efficiency and creativity. We are dedicated to crafting exceptional mobile and desktop experiences for those who aspire to achieve more.

Fluix is a B2B workflow automation platform, formed as a subsidiary company to Readdle. Fluix empowers world-class businesses with efficient workflows, operational excellence, fast deployment, customization, and stellar support for unleashing their full potential. Our customers include Siemens, BMW, Scandinavian Airlines, Roche Farma, Zurich Insurance, and hundreds of others.

About the role:

We are looking for a Senior Back-end Product Engineer who takes real end-to-end ownership: from understanding the customer problem and designing the solution, to shipping it, running it in production, and improving it. This is a role for an engineer who works autonomously, thinks in product outcomes rather than tickets, and uses AI as a daily part of the craft.

You’ll work on the core backend systems behind Fluix – from workflow automation and offline mobile synchronization to document processing, e-signatures, and integrations with enterprise platforms. You’ll build new capabilities while also evolving and improving a mature product used by real customers every day.

What you will do:

• Own features end-to-end — from understanding the problem and designing the solution to production release and further improvements.
• Design backend services, APIs, and data models with scalability, reliability, and maintainability in mind.
• Scope and decompose your own work, make architectural decisions, and present your solutions to the team.
• Challenge requirements and technical approaches when you see a better, simpler, or more efficient solution.
• Build new functionality while refactoring and improving the existing codebase, including test coverage.
• Use data, logs, and customer feedback to investigate problems and make product and technical decisions.
• Use AI tools daily for development, refactoring, code review, testing, documentation, and investigation, and help improve AI practices across the team.
• Improve the development lifecycle by automating repetitive work and strengthening observability, alerting, and release processes.
• Participate in shared on-call and support rotations: investigate production incidents and customer‑reported issues, identify root causes, and implement long‑term solutions.
• Prepare release plans and manage deployments.
• Collaborate closely with Backend, Frontend, iOS, Android, Support, and other teams to deliver reliable product experiences.
• Continuously improve engineering practices, propose your own initiatives, and share knowledge with the team

About you:

• 5+ years of backend engineering experience, with experience owning complex features or services end-to-end — from solution design to production.
• Strong proficiency in PHP and Symfony, with solid knowledge of system and API design, design patterns, clean code practices, and DDD.
• Hands‑on experience with AWS services (EC2, S3, SQS, Lambda, DynamoDB, RDS, IAM), plus familiarity with Kubernetes and serverless architectures.
• Strong debugging and profiling skills (Xdebug, Blackfire), with experience in CI/CD, automated testing, and observability.
• Familiarity with JavaScript/TypeScript, Node.js, and frameworks such as ExpressJS or NestJS.
• You systematically use AI as part of your daily development workflow and can explain what you use it for, what you delegate to it, and how you validate the output. Experience delivering AI/LLM-powered product features is a plus.
• Good understanding of application security and OWASP principles; experience working with ISO 27001, SOC 2, or similar security standards is a plus.
• You are autonomous and product‑minded: comfortable starting with a problem, designing a solution, making technical decisions, and driving it through to production.

What you will get at Readdle:

• Customer‑centric culture. We put our users at the heart of everything we do. Every team member has the opportunity to engage directly with customers, gaining insights that shape meaningful, delightful experiences for millions worldwide.
• Relentless growth. We're committed to mastery in our craft. We take ownership of our work, decisions, and outcomes, and we see feedback as a catalyst for growth. Every challenge is an opportunity to learn, evolve, and raise the bar.
• Exceptional people, exceptional team. Our greatest strength is our people. We care deeply about each other, work transparently, and celebrate collective success. Together, we build an environment where everyone can do their best work and grow beyond their potential.
• Real impact. We design products that truly matter. Our focus is on delivering tangible value, simplifying complexity, pushing boundaries, and continuously improving how we build and deliver solutions to our users.
• Culture of innovation. We embrace curiosity and creativity in everything we do. Fresh ideas are not just welcomed, they're expected, celebrated, and turned into real innovations that shape the future of our products and company.