Senior Full Stack Software Engineer

Location: Remote - This position can be performed from any location and must overlap with East Coast hours. About NXTThing RPO NXTThing RPO is a technology-enabled talent acquisition and workforce solutions company that combines innovative recruiting technology with deep industry expertise to help organizations hire smarter, faster, and more effectively. Our approach blends advanced automation, artificial intelligence, workforce analytics, and recruitment marketing with a high-touch service model that delivers exceptional results for both clients and candidates. At the core of our offering is a suite of proprietary talent technology solutions, including Personegy, our AI-powered hiring platform, Talentegy, our candidate and employer experience intelligence platform, and our broader Talent Intelligence Platform, which helps organizations optimize recruiting performance through data-driven insights and workforce analytics. Together, these solutions enable companies to streamline sourcing, screening, scheduling, onboarding, and talent engagement while improving hiring outcomes and the overall candidate experience. Whether supporting enterprise recruiting, high-volume hiring, employer branding, or talent intelligence initiatives, NXTThing combines the power of cutting-edge technology with the expertise of experienced talent professionals to help organizations build stronger, more agile workforces and achieve long-term business success. Role Overview We are seeking a Senior Full Stack Developer with expertise in Ruby on Rails, React, AWS, and modern cloud-native development practices to join our growing development team. This is a long-term contract opportunity for a highly skilled engineer who enjoys building scalable web applications, designing robust architectures, and working in a fast-paced environment., * Design, develop, and maintain highly scalable web applications using Ruby on Rails on the backend and React.js/TypeScript on the frontend.

• Architect and implement robust, scalable, secure, and maintainable backend solutions, integrating multiple data sources and databases.
• Develop responsive and user-friendly front-end interfaces using React.js, TypeScript, HTML5, and CSS3.
• Design and optimize PostgreSQL database schemas, queries, indexing strategies, and overall database performance.
• Build and maintain RESTful APIs and GraphQL services for internal and external integrations.
• Optimize application performance, reliability, maintainability, and security across the entire technology stack.
• Ensure high code quality through best practices, including code reviews, unit testing, integration testing, and end-to-end testing.
• Collaborate with product managers, business stakeholders, designers, and engineering teams to define, design, and deliver new features.
• Work with AWS services (EC2, ECS/EKS, S3, RDS, SES, Lambda, CloudWatch, IAM, Route53, etc.) to ensure high availability, scalability, and security of applications.
• Develop and maintain containerized applications using Docker.
• Maintain and improve CI/CD pipelines to streamline testing, deployment, and release processes.
• Implement monitoring, logging, and observability solutions using tools such as CloudWatch, Datadog, New Relic, Sentry, or similar platforms.
• Participate in architectural discussions, technical planning, and technology selection decisions.
• Mentor junior developers and contribute to engineering best practices.
• Stay current with emerging technologies, industry trends, and software development best practices.

7+ years of professional software development experience, including significant experience building and maintaining production-grade web applications. Strong expertise in Ruby on Rails, with a deep understanding of Ruby and its ecosystem. Strong understanding of object-oriented programming principles, software design patterns, and scalable application architecture. Extensive experience with React.js and modern JavaScript (ES6+). Strong experience with TypeScript in modern React applications. Experience with HTML5, CSS3, responsive design, and modern front-end development practices. Familiarity with state management libraries such as Redux and React Context. Strong knowledge of RESTful API design, GraphQL, and API security best practices. Experience designing and optimizing PostgreSQL databases, including schema design, indexing, and performance tuning. Experience integrating and managing multiple databases and external data sources. Comfortable using AI-assisted development tools (such as GitHub Copilot, Cursor, Claude Code, or similar) to improve productivity, while maintaining the ability to independently design, write, debug, and maintain production-quality code. Demonstrated ability to critically review, test, troubleshoot, and refine AI-generated code. Candidates must understand the code they deliver and should not rely on AI tools as a substitute for strong software engineering fundamentals, architectural judgment, or problem-solving skills. Understanding of MVC architecture, ORM frameworks, and domain-driven design principles. Experience with Docker and containerized application development. Experience building and maintaining CI/CD pipelines. Hands-on experience deploying and managing applications within AWS environments. Knowledge of web application security principles, including authentication, authorization, OWASP best practices, and secure API design. Experience with Git and modern version control workflows. Strong problem-solving, communication, and collaboration skills. Demonstrated ability to take ownership of projects from conception through deployment and ongoing support. Ability to work independently with minimal supervision and refine requirements in collaboration with business stakeholders. Ability to overlap East Coast hours at least from 8:00 AM - 12:00 PM ET. Preferred Qualifications Experience with distributed systems, microservices architecture, and event-driven applications. Experience with Redis, Sidekiq, Elasticsearch/OpenSearch, or similar technologies. Experience integrating third-party APIs and AI/LLM platforms such as OpenAI, Anthropic, or AWS Bedrock. Experience with infrastructure-as-code tools such as Terraform or CloudFormation. Advanced or fluent Russian/Belarusian language skills. Bachelor’s or Master’s degree in Computer Science, Software Engineering, or equivalent practical experience. Experience mentoring developers and leading technical initiatives.