Senior Fullstack Nodejs/React Software Engineer

Growth Acceleration Partners • Colorado Springs, CO

3h

About The Position

We are looking for a Senior Software Engineer to join a high-impact SaaS platform operating in a complex, multi-tenant environment. This role is primarily hands-on, focused on building and evolving scalable fullstack solutions, while also contributing to technical decision-making and guiding engineering best practices. You will work across modern and legacy systems, supporting platform modernization initiatives, third-party integrations, and real-time workflows. While prior experience as a formal Tech Lead is a plus, this role requires strong technical judgment, ownership, and the ability to influence and guide other engineers through design discussions, code reviews, and architectural decisions.

Requirements

• 6+ years of professional experience in software engineering.
• Strong experience working as a senior individual contributor in fullstack environments.
• Demonstrated ability to make sound technical decisions and influence solution design within engineering teams.
• Strong analytical and problem-solving skills.
• Clear and effective communication, especially when discussing technical trade-offs.
• Ownership mindset, taking responsibility for solutions from design through production.
• Ability to collaborate closely with product managers, designers, and other engineers.
• Comfortable mentoring and providing technical guidance, even without formal leadership authority.
• Adaptable and effective when working across legacy systems and modern frameworks.
• Strong fullstack development experience using JavaScript/TypeScript and at least one backend language such as Ruby, Python, or Node.js.
• Hands-on experience with React and modern frameworks such as Next.js.
• Solid understanding of RESTful and GraphQL API design and implementation.
• Experience working with relational databases, including PostgreSQL, complex queries, and data modeling.
• Proven experience building and maintaining third-party API integrations, including OAuth authentication, webhooks, rate limiting, and error handling.
• Familiarity with asynchronous processing and event-driven architectures (e.g., message queues, background jobs).
• Experience working in cloud environments, preferably AWS, including services such as Lambda, SQS, S3, and CloudFront.
• Regular use of AI-assisted development tools (e.g., Cursor, Copilot, Claude Code) to improve development efficiency and code quality.
• Experience with version control systems and CI/CD pipelines (e.g., GitHub Actions).

Nice To Haves

• Previous experience acting as a Tech Lead or informal technical lead.
• Ruby on Rails experience (Rails 5+ / 6+).
• Serverless architectures and frameworks (AWS Lambda, Chalice, Serverless Framework).
• Experience with multi-tenant SaaS architectures and tenant isolation patterns.
• React Native (Expo) experience for mobile applications.
• Redis for caching and session management.
• Docker-based containerization and deployment workflows.
• Automated testing frameworks (RSpec, Jest, Pytest).
• Monitoring and observability tools (New Relic, CloudWatch, Amplitude).

Responsibilities

• Design, implement, and maintain fullstack features across modern and legacy components of the platform.
• Participate in technical design and architecture discussions, proposing solutions and evaluating trade-offs.
• Support the ongoing migration from a monolithic architecture to modern, scalable frameworks while maintaining platform stability.
• Build and maintain reliable integrations with external systems, ensuring data consistency and resilience.
• Provide technical guidance through code reviews, pair programming, and design feedback.
• Promote engineering best practices related to quality, performance, security, and maintainability.
• Troubleshoot and resolve complex production issues across distributed and real-time systems.
• Collaborate closely with product and engineering teams to deliver high-quality solutions aligned with business goals.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Number of Employees: 251-500 employees