Senior Fullstack Developer (PHP+React)

About SINGU At SINGU, we’re redefining how the world’s most ambitious real estate companies run their operations. Our mission is to become Europe’s leading platform for managing warehouse, logistics, retail, and multi-site commercial real estate portfolios — empowering our Clients to protect revenue, boost efficiency, and unlock new value across every aspect of their business. Our unified CAFM platform already powers the daily operations of over 250 million m² of real estate worldwide, supporting more than 500,000 professionals. Following our union with the UK’s Micad and Germany’s net-haus, we now help manage 100,000+ buildings across 35+ countries — and we’re just getting started. Backed by a leading growth equity investor, we’re scaling rapidly and partnering with global leaders such as Prologis, ECE, CTP, Hillwood, Logicor, GLP, and Unibail-Rodamco-Westfield. As we continue to grow through strategic acquisitions and bold innovation, we stay true to our core values: adaptability, collaboration, and client focus. If you’re ready to help build Europe’s leading platform for property operations — and make a tangible impact on how the real estate industry works — join SINGU and be part of this transformation. About SINGU SINGU is one of the fastest-growing PropTech companies in Europe. Our platform manages over 200 million sqm of commercial real estate for 500+ clients in 35 countries, helping property managers digitalize and automate their operations. About The Team The TAM (Technical Account Management) team delivers customizations, dedicated functionality and system integrations for our largest enterprise clients - international leaders such as Prologis, P3, CTP and AmRest. A significant part of the work is data imports/exports and integrations with external systems (ERP, HR, finance, SSO), where security, data correctness and database performance are critical. Customizations must fit into a shared, multi-tenant product - so design quality matters as much as delivery speed. Tech Stack Backend: PHP 8 (Phalcon), REST APIs, Redis, background job queuesDatabase: PostgreSQLFrontend: React (TypeScript)Tooling: Git (Git Flow), Docker, CI/CD, PHPUnit, PHPStanAI-assisted development: Claude / Cursor / Copilot are part of our daily workflow What You’ll Bring Must-have 5+ years of commercial PHP backend development (7.4+/8)Expert PostgreSQL - query optimization, indexing, execution plans, migrations on large datasetsProven experience designing and maintaining REST APIsHands-on experience with data import pipelines and external system integrations (files, APIs, queues) - idempotency, validation, error handling, reprocessingWorking React knowledge - you can deliver a feature end-to-end when needed, not only read the codeStrong focus on security (secure coding, access control, data protection) and performance of high-volume operationsFull ownership of delivered solutions - from technical design to production and supportExperience mentoring other developers and doing meaningful code reviewsYou actively use AI tools (Claude, Cursor, Copilot, ChatGPT) in your daily workCommunicative English (B2+) - technical specs, tickets, documentation; occasional calls with client technical teamsFluent Polish - the team works in Polish internally Nice to Have Phalcon frameworkPostgreSQL tuning (partitioning, vacuum, planner) and performance troubleshooting in productionERP / enterprise integrations (SAP, Dynamics, PeopleSoft), SSO (SAML / OIDC)Docker, AWS, CI/CDCustomization-heavy or multi-tenant B2B SaaS backgroundImproving test automation and local development environments What You’ll Do Design and implement integrations and custom functionality for enterprise clientsBuild secure, high-performance backend services in PHP, and extend React frontends when the feature needs itDesign and optimize data import/export processes with focus on security, data integrity and performanceFind and remove performance bottlenecks in application and database layersTake part in technical breakdown and estimation before development starts; co-own API contractsReview code and mentor mid-level developers; be a go-to person for backend and database topicsCollaborate with the Tech Lead, QA, and other SINGU teams (Platform, Core) Why This Role Real integrations with enterprise systems - not toy projectsDirect impact on systems used daily by some of the largest companies in EuropeSenior influence: your technical opinion shapes how the team buildsA team that values clean code, security and performance If this role sounds like a good fit, we’d love to hear from you. Apply and help us build technology that supports critical operations every day. Compensation Range: PLN 18K - PLN 22K