Mid Level React Developer Jobs in Connecticut (NOW HIRING)

Description

Company Description

Payarc is a technology-driven payments company built to empower people and improve their organizations, one payment at a time. What began as smart, simple payment-processing tools and products has grown into a broader platform, backed by a team of world-class experts and top technology talent. We help new businesses get started, increase our customers' revenues, and bridge the gap between merchants and modern payment solutions-giving companies the tools they need to change the future of their business.

Position Summary

The Software Engineer II is a mid-level engineering role responsible for designing, developing, testing, and maintaining scalable software solutions with limited guidance. This role owns features and components end-to-end and collaborates with cross-functional teams to deliver high-quality payment applications, services, and systems.

The Software Engineer II contributes across all phases of the software development lifecycle-from requirements analysis through deployment and ongoing support-and is expected to uphold Payarc's engineering standards and secure, PCI DSS-compliant data-handling practices.

Essential Duties and Responsibilities

• Design, develop, and maintain software applications, APIs, and backend services with limited guidance
• Build and integrate secure APIs and services, including payment-related functionality, in compliance with PCI DSS
• Write clean, maintainable, and well-documented code
• Participate in code reviews and pull requests-both giving and receiving constructive feedback-and follow engineering best practices
• Collaborate with product managers, UI/UX designers, and other engineers to deliver features that meet user and business needs
• Debug, test, and resolve technical issues of moderate complexity, including production defects surfaced through monitoring tools
• Contribute to system architecture and design discussions
• Optimize application performance, scalability, and reliability
• Ensure security, privacy, and data-protection standards are followed, including secure handling of sensitive and cardholder data
• Evaluate and adopt new technologies and tools that improve development efficiency
• Mentor and support Software Engineer I team members as needed
• Participate in Agile/Scrum ceremonies using JIRA and Confluence (as applicable)

Technology Environment

Payarc engineers work across a broad, modern technology stack. Depending on the team and project, you may work with:

• Backend: PHP (Laravel, Nova, Apiato) and services in languages such as Java, C#, Python, Go, and C++
• Frontend: JavaScript with React and Angular, plus jQuery; HTML5, CSS3, LESS/SASS; Material Design
• Mobile: native Android (Kotlin, Java) and iOS (Swift, Objective-C), with cross-platform work in React Native/Flutter; libraries such as Retrofit, OkHttp, and Firebase
• Data: relational databases (MySQL, Oracle, Firebird) and NoSQL data stores
• Cloud & DevOps: Amazon Web Services (AWS), Git/GitHub, CI/CD pipelines, Docker, and Kubernetes
• Payments & security: PCI DSS-compliant systems, encryption standards such as TDES and DUKPT, and integrations with POS systems, terminals (e.g., PAX, AMP), and Magtek card readers
• AI & machine learning: applied ML and LLM-based workflows in Python (TensorFlow, PyTorch, scikit-learn), including vector databases and embeddings
• Collaboration & tooling: Agile/Scrum delivery with JIRA and Confluence, and application monitoring with tools such as Crashlytics and New Relic

Requirements

 QualificationsRequired

• 2-4 years of professional software development experience
• Proficiency in one or more of Payarc's core languages and frameworks (e.g., PHP/Laravel, JavaScript with React or Angular, Java, C#, Python, or Kotlin)
• Experience building and consuming RESTful APIs and web services
• Experience with relational databases such as MySQL or Oracle
• Proficiency with Git/GitHub, including pull requests and code reviews
• Strong problem-solving and analytical skills

Preferred

• Experience with cloud platforms (AWS, Azure, GCP), with AWS preferred
• Familiarity with CI/CD pipelines
• Experience with containerization (Docker, Kubernetes)
• Knowledge of NoSQL databases
• Mobile development experience (Android with Kotlin, Retrofit/OkHttp, Firebase) or applied AI/ML exposure
• Familiarity with PCI DSS and secure handling of cardholder data
• Exposure to encryption standards such as TDES and DUKPT
• Experience working in Agile environments with JIRA and Confluence

Knowledge, Skills, and Abilities

• Strong understanding of software design principles
• Ability to write efficient, scalable, and maintainable code
• Ability to work independently on features of moderate complexity
• Strong collaboration, communication, and interpersonal skills
• Ability to manage multiple tasks and deadlines
• Sound judgment and resourcefulness in solving problems
• Commitment to code quality, testing, and security
• Continuous learning mindset

Education

• Bachelor's degree in Computer Science, Software Engineering, or a related field required (or equivalent practical experience).

Work EnvironmentThis position operates in a professional office or remote environment, based out of Payarc's Greenwich, CT office with flexibility as needed. Standard business hours apply, with flexibility to meet development timelines and support releases.Physical Requirements

• Prolonged periods sitting at a desk and working on a computer
• Extended periods typing and analyzing information
• Ability to participate in virtual or in-person meetings

This job description may not be inclusive of all assigned duties, responsibilities, or aspects of the job described, and may be amended at any time at the sole discretion of the Employer with or without prior notice.