Senior (API) Integration Engineer

Callibrity is based in Cincinnati, Ohio. This role is a full-time hybrid position and only candidates within commuting distance to Cincinnati will be considered. 

Callibrity is a developer owned and managed custom software development consulting company that is dedicated to creating quality software using modern technologies and adding unquestionable business value to companies across multiple industries and verticals. We are problem solvers...people who like a challenge and enjoy working with modern tech stacks. We offer an incredibly collaborative culture and enjoy solving complex problems with our clients. If you are looking for a company where you can grow in your career and that values people, transparency, and flexibility we would like to talk to you.

As a Senior (API) Integration Engineer, you are a leader by example and a subject matter expert in designing, building, and integrating APIs and distributed systems. You will work closely with client stakeholders, architects, and delivery teams to design scalable integration solutions that connect systems, move data reliably, and enable business outcomes. This role is ideal for someone who enjoys greenfield and modernization work, understands enterprise integration challenges, and can translate business needs into robust, well-governed API solutions. Engineers at Callibrity tend to have longer tenures and higher retention rates because the work is challenging and rewarding, the engineering culture is strong, and we invest deeply in our people.

Responsibilities:

• Serve as a trusted advisor to clients on API strategy, integration patterns, and system design
• Design, build, and maintain RESTful APIs and integration services
• Lead technical discussions around API standards, versioning, security, and governance
• Mentor and upskill Callibrity consultants and client engineering teams
• Translate business and integration requirements into scalable technical solutions
• Proactively identify integration risks, performance bottlenecks, and failure points
• Communicate complex integration concepts clearly to both technical and non-technical stakeholders
• Demonstrate and teach best practices related to API design, CI/CD, DevOps, and test automation
• Stay current on emerging technologies including cloud-native integration, event-driven architectures, and AI-enabled workflows
• Thrive in environments with close collaboration across engineering, product, QA, and architecture roles
• Be someone clients trust and rely on regardless of title or seniority

Requirements:

• 7+ years of professional experience building and supporting API-driven and integrated systems
• Strong experience designing and implementing RESTful APIs and service integrations
• Hands-on experience with API frameworks and platforms (e.g., FastAPI, Flask, Spring Boot, Azure API Management, Apigee, or similar)
• Strong understanding of integration patterns, messaging, and distributed systems concepts
• Experience working with cloud platforms such as AWS, Azure, and/or Google Cloud Platform
• Familiarity with Infrastructure as Code and CI/CD pipelines
• Experience with Docker and containerized services; Kubernetes is a plus
• Experience with performance, reliability, and observability in API ecosystems
• Experience integrating with external vendors and third-party systems
• Relevant professional experience in IT and/or consulting
• Four-year degree, respected bootcamp/accelerator, or equivalent practical experience
• Ability to successfully complete Callibrity’s CoderPad and Code Pairing challenges
• Strong interpersonal skills: influence, professionalism, accountability, curiosity, and a “shared ownership” mindset
• Embodies Callibrity’s Core Values
• Must be authorized to work in the United States, without sponsorship

Benefits of Being a Callibrity Consultant:

• Health/Vision/Dental insurance effective day 1 of employment
• 401k match vested immediately
• Annual training/conference stipend
• Paid parental leave
• Paid bench time
• Paid flex time for training, blogging, speaking engagements, and thought leadership
• Paid time off for vacation, holidays, and sick days
• Competitive industry salary
• Weekly lunch and learns
• Regular team-building events
• Small company feel with the resources of a sustainable and proven business model
• High employee retention and satisfaction (One of Cincinnati’s Best Places to Work!)
• Work-life balance