Senior Software Engineer (React Native, React and TypeScript)

Offer summaryPosition: Senior Software Engineer (React Native, React and TypeScript)Employment type: permanent contract of employment or b2b contract Salary gross (CoE): 18 000 – 25 000 PLNSalary net (B2B): 20 000 – 29 000 PLNPossible work locations: up to you - remote or from our office in WeWork Mennica Tower (ul. Prosta 20, Warszawa – city centre)HL Tech size: 65 people in Poland – part of the British Hargreaves Lansdown Group (2,500 colleagues)Reporting to: Senior Engineering ManagerTribe: Trading Join Hargreaves Lansdown and be part of the team building software for the UK’s largest investment platform.With over 40 years of history, Hargreaves Lansdown has become the UK’s well-established investment platform for private clients, used by 2 million investors and managing more than £172 billion in savings and investments. HL’s platform allows clients to bring all their ISAs, pensions, SIPPs, and savings into one easy-to-manage place.HL Tech is a Polish technology hub within Hargreaves Lansdown’s Digital division (700 colleagues). We work as one integrated digital team with colleagues in the UK, jointly building and developing the systems that power the entire HL investment platform. Our teams are fully mixed across both locations, sharing ownership, engineering standards and delivery practices. Together, we design new features, improve platform reliability, and develop solutions that help HL deliver consistent, high‑quality outcomes for millions of clients. We don’t just maintain existing systems — we collaborate closely with HL’s UK teams to build new products and capabilities that move the platform forward.We are looking for a Senior Software Engineer to help promote our dedicated, friendly and growing Trading Team to deliver critical new functionality to our clients and internal users. If you enjoy working with clean architecture, modern technologies, and being part of a positive team that learns from each other, we’d love to hear from you!Why join us?Work the way you want – Most colleagues work remotely, but you can also work from our office in WeWork Mennica Tower in central Warsaw. Please note, all work must be performed within Poland, as remote work from abroad is not allowed.Healthy work-life balance – we value your time, which means no overtime culture.Helpful, knowledge-exchange team – work jointly with experienced engineers who are passionate about clean code, best practices, and continuous learning.Modern tools & technologies – develop enterprise-scale solutions in a technology-focused environment.What you’ll doBuilding and deploying scalable, fault-tolerant microservices at pace, owning them end-to-end.Integrating with cloud applications, operating in a zero-trust, security-first environment.Delivering value iteratively, always focused on customer outcomes and short feedback loops.Creating and visualising application metrics to evaluate usage patterns and detect anomalies.Reviewing code with peers, with an eye for both quality and velocity. Working with others in the team to solve problems, not just deliver features.Innovating and bringing new ideas for adoption across HL Digital.Driving technical choices and shaping how we build our services.Providing coaching and mentoring to peers.About YouAt least 5 years of experience working with React Native, React and TypeScript including enterprise-grade experience (experience with large app decomposition, layers separation, and scalable architecture for enterprise-level applications).Experience with architecture and design patterns.Familiarity with different styling solutions (StyleSheet, Styled Components, Unistyles).Efficient React Native debugging skills — ability to troubleshoot and resolve complex issues with React Native applications using debugging tools, logs, and error tracking.Practical knowledge of JavaScript and testing frameworks (Jest, Detox, Testing Library).Experience in Brownfield Development.Experience working with REST API and/or GraphQL.Understanding of state management patterns and solutions like Redux and Mobx.Min B2-level proficiency in both English and Polish Technical Skills React Native, React and TypeScript Styling solutions (StyleSheet, Styled Components, Unistyles)Jest, Detox, Testing LibraryREST API and/or GraphQL.Redux, MobxBenefitsCopyrights (50% tax relief due to creative type of work)PPE (4% employer contribution without any additional cost nor employee contributions required)Annual bonus based on performancePrivate health care & Life insuranceMyBenefit Cafeteria (benefits platform)2 additional days for volunteering eventsTeam eventsThe Buddy programmeOpportunity to grow according to your level of expertiseWorking with new technologies and a multi-diverse teamMany opportunities to exchange knowledge and ideasIn-house TrainingsWe are an inclusive employer that values diversity in its workforce. We encourage applications from all individuals without regard to race, religion, gender, sexual orientation, national origin, disability or age.