Principal Full Stack Software Engineer


Drogheda, IE
  • Job Type: Full-Time
  • Function: Engineering Software
  • Post Date: 05/28/2021
  • Website:
  • Company Address: 2121 N. California Blvd. Suite 400, Walnut Creek, CA, 94596

About YapStone

Yapstone is a provider of online and mobile payment solutions for global marketplaces and software platforms.

Job Description

Developing innovative technologies to revolutionize the payments industry while helping customers transact in global marketplaces is not for the faint of heart. We have big goals and are looking for people to join our team who want to leave a legacy. Just as you are committing to do your best work, we are committed to making this the best place you’ve ever worked. It’s a partnership from the very beginning. If you are looking to step outside your comfort zone, learn new things, apply your skills, collaborate with brilliant people and have fun along the way, then you might be our next Yapster! We promise to provide you with an amazing journey along your career. At Yapstone, we don’t just accept difference — we celebrate it, we support it, and we thrive on it for the benefit of our employees. Yapstone is proud to be an equal opportunity workplace.

We are seeking a Principal Full Stack Software Engineer that’s experienced in both Front end development and Back end development. The successful candidate will be comfortable with different coding languages, development frameworks and third-party libraries. They will be a Team player with excellent verbal, written communication, and cross functional collaboration skills. Versatile and resourceful, they will take challenges in their stride and have an appetite for continuous learning. The success candidate will contribute towards building a globally scalable, secure, performant, and configurable unified platform to bring electronic payments to new and existing markets. This is a high impact role with the opportunity to make significant contributions to the time to market, scalability, performance, and maintainability of leading-edge digital payments platform and with an aptitude for visual design and utility. Previous experience is preferable in Payments, Banking, Insurance working in a high transaction volume, scalable, secure platform with large data infrastructures.

Primary Responsibilities

  • Position duties and responsibilities

  • Serve as main contributor in the design, development, and deployment of significant web, UI and backend services

  • Own and collaborate on key architectural decisions and design considerations

  • Research and recommend technology selections as well as provide technical guidance to 3rd party integrations

  • Deliver prototypes and proof of concepts using leading edge technologies and frameworks

  • Monitor and plan out enhancements

  • Troubleshoot and resolve system problems and client issues

  • Lead projects and exert technical influence over the team, increasing their productivity and effectiveness by sharing your deep knowledge and experience

  • Actively mentor individuals and promote best software engineering practices across design, build, and test

  • This position temporarily works remotely due to COVID-19

  • Providing prompt and appropriate project, vendor, and client reporting information to the Software Engineering Manager.

  • Perform architecture, capacity planning, monitoring, maintenance, tuning and workload management of all key services to ensure that the systems meet SLAs.

  • Undertaking professional development to maintain skills and knowledge in areas of technical expertise.


  • Professional experience

  • 10+ years of relevant technical experience on Web, UI and backend technologies and developing successful products

  • Experience delivering solutions utilizing modern technologies

  • Experience with object-oriented design, coding, testing patterns, Micro Front End design patterns and UX best practices

  • Experience in engineering (commercial or open source) software platforms and large-scale data infrastructures

  • Successfully delivered highly scalable distributed systems, using open source tools.

  • Broad engineering experience and proven track record in the e-commerce and payments space, in externally facing, high performance, large scale applications

  • Thought leader, hands-on contributor, and decision maker known for solving difficult software engineering problems

  • Previous experience in Finance/FinTech/Payments industry.

  • Sound commercial UI experience is essential

  • JavaScript (ES5 / ES6), ReactJS (components, Forms, Events, Keys, Router) or Angular, state management framework (Redux, RxJs or NgRx)

  • HTML5 & CSS3, scalable/modular CSS, & preprocessors SCSS & LESS.

  • Building Single Page applications with modular approach, Knowledgeable in developing responsive mobile-first UI with Bootstrap 4 or Material UI layout frameworks.

  • Experience of Build & Test Automation technologies like Jest, Cypress or Selenium.

  • Experience in Payment Widgets and tokenization, BI reports an advantage

  • Micro Front End design patterns and UX best practices is advantageous

  • Experience with NGINX, Docker, GraphQL

  • Solid back end experience is necessary

  • Extensive knowledge in Java Microservices (Java, Spring boot) and the associated CICD tools and frameworks

  • Expert knowledge in NoSQL (Couchbase is preferred)

  • Experience building web technologies including cloud-based APIs and protocols (REST, JSON)

  • Experience in building cloud native applications in major cloud platforms (preferably in AWS) a major plus.

  • Experience in distributed message / event processing solutions like Kafka

  • Expertise in Java development and RESTful services

  • Experience in an Agile development environment.

  • Experience in the Payments or high transactional processes, volume, security and scalability

  • Excellent verbal and written communication skills

  • Experience in the Payments or high-volume transactional processes, high scalability, and highly secure transaction platform with large data infrastructures

  • Desired Skills

  • Knowledge of Couchbase, ElasticSearch and Kafka

  • Experience with continuous integration (Jenkins) and version control (Git)

  • Qualifications

  • The candidate must possess a Bachelor’s Degree in Computer Science or related field.

  • Languages

  • Fluent in English.

  • Yapstone is an equal opportunities employer.

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Disclaimer: Local Candidates Only
This company does NOT accept candidates from outside recruiting firms. Agency contacts are not welcome.