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US 3w PTO

  • Design and implement RESTful, SOAP, or GraphQL services following API-first principles.
  • Integrate third-party services and implement robust authentication and authorization mechanisms.
  • Monitor performance, resolve bottlenecks, and implement caching and load-balancing techniques.

Python Java JavaScript C# REST

20 jobs similar to API Senior Developer

Jobs ranked by similarity.

US Unlimited PTO

  • Own partner integrations end-to-end, serving as the primary technical contact from first call to final delivery.
  • Get hands-on with APIs, testing integrations, troubleshooting issues, and helping partners navigate SSO and platform standards.
  • Translate requirements into action by gathering developer needs and converting them into clear user stories for Product and Engineering.

Personify Health created the first and only personalized health platform, bringing health plan administration, holistic wellbeing solutions, and comprehensive care navigation together in one place. The team serves employers, health plans, and health systems with data-driven solutions, and is mission-driven to empower healthier lives.

$143,200–$243,400/yr
North America Canada Unlimited PTO

  • Design, develop, and maintain backend services and APIs for the IAM platform, ensuring high performance and scalability.
  • Collaborate with cross-functional teams to build features that align with business goals and meet security requirements.
  • Enhance the performance, security, and scalability of the IAM platform through code reviews, testing, and refactoring.

ServiceNow, acquiring Veza, pioneers in identity security, focuses on answering the fundamental question of who can and should take what action on what data. With the scale and resources of an enterprise platform company, they maintain the product velocity and mission-driven focus of a security innovator.

Global

  • Design, develop, and maintain Python-based solutions, services, and APIs for billing platform integration.
  • Build scalable, reliable, and secure integration solutions following best practices.
  • Troubleshoot, debug, and optimize complex workflows while collaborating with project managers.

Miratech is a global IT services and consulting company that supports digital transformation for large enterprises. With nearly 1000 full-time professionals, they have a culture of Relentless Performance and a 99% project success rate.

US Unlimited PTO

  • Craft streamlined user flows and build robust APIs for bank administrators and customers.
  • Write clean, thoroughly documented, and well-tested code with emphasis on error handling and edge cases.
  • Provide technical guidance and code reviews, raising the bar for teammates.

Alkami provides a digital sales and service platform for U.S. banks and credit unions. Founded in 2009, it is a fast-growing SaaS company with a culture recognized as Best Place to Work in Fintech and Best Company Culture.

US

  • Lead design and development of complex software systems, ensuring high-quality, scalable, and maintainable distributed applications.
  • Mentor junior engineers and lead agile teams to deliver new features while adhering to best practices and Mercury standards.
  • Collaborate with cross-functional teams and stakeholders to translate product requirements into robust technical solutions.

Mercury Insurance helps people reduce risk and overcome unexpected events. As one of America's Best Midsize Employers for 2026, they foster a collaborative culture with diverse perspectives and professional growth opportunities.

US

  • Design, develop, and maintain scalable web/Windows applications using .NET technologies.
  • Integrate back-end API services with front-end UI components across multiple application modules.
  • Lead technical discussions within the Scrum team and conduct thorough code reviews.

Globe Life is an insurance company committed to empowering employees with support and opportunities. They foster a caring and innovative culture focused on diversity and inclusivity.

US

  • Design and implement scalable backend services and APIs for thick client desktop applications.
  • Develop and maintain data processing pipelines for structured and semi-structured data.
  • Optimize backend systems for performance, concurrency, and efficient resource utilization.

Agile Defense provides adaptive innovation to support the nation's most important missions through advanced technologies. The company values its employees as family, fostering a culture defined by the 6Hs: Happy, Helpful, Honest, Humble, Hungry, and Hustle.

US 5w PTO

  • Build and enhance production-grade software applications using AI-assisted development workflows.
  • Design and implement clean, well-structured APIs, services, and application components.
  • Collaborate closely with the AI-Native Tech Lead to implement engineering best practices and deliver features end-to-end.

Cotiviti is a leading solutions and analytics company that leverages clinical and financial datasets to deliver insights into healthcare system performance. The company focuses on helping healthcare organizations improve financial performance and quality.

Global Unlimited PTO

  • Serve as the first point of contact for customers, responding to technical and functional support requests across multiple channels.
  • Investigate, prioritize, troubleshoot, and resolve complex technical issues related to APIs, SDKs, and platform integrations.
  • Collaborate with engineering teams to escalate and resolve bugs, providing detailed technical context and reproduction steps.

Jobgether is a company that uses an AI-powered matching process to ensure the applications are reviewed quickly, objectively, and fairly against the role's core requirements. They foster a strong focus on autonomy, ownership, and performance-based culture.

US

  • Lead the design and development of APIs using the MuleSoft Anypoint Platform, including reusable components and RAML specifications.
  • Architect integration flows connecting multiple SaaS platforms, managing the full API lifecycle from design to deployment.
  • Configure API security policies and gateways, perform testing and optimization, and collaborate with stakeholders for knowledge transfer.

Tier One Technologies provides technology staffing and consulting solutions. They operate as a contract-based service provider for government clients, with a professional and detail-oriented culture.

US

  • Develop and maintain Application Program Interfaces (APIs) and customize user interfaces for USCG information systems.
  • Conduct operational and user acceptance testing, gather user feedback, and prioritize product roadmap features.
  • Provide Tier 3 support Monday through Friday, investigating and resolving code-level issues via the USCG ticketing system.

By Light Professional IT Services LLC supports defense, civilian, and commercial IT customers worldwide, preparing warfighters and federal agencies with technology systems. Headquartered in McLean, VA, the company, including its CESI division, is a premier provider of modeling and simulation training solutions.

Global

  • Lead design and development of product features for highly available payment processing, subscription billing, and reporting platforms.
  • Debug and troubleshoot complex issues, optimize system performance, and ensure reliability across money-movement flows.
  • Mentor junior team members and lead adoption of best practices for coding standards, testing, and deployment.

FastSpring is the world's leading ecommerce platform for software and SaaS companies, powering sales growth for over 3,500 companies in more than 200 countries. Founded in 2005 and privately owned, we are an Inc. 5000 honoree with offices globally and a remote-first, inclusive culture.

US Unlimited PTO

  • Manage and scale third-party partner ecosystem within the Origami Marketplace.
  • Develop and execute partnership agreements with a commercial mindset to drive revenue.
  • Collaborate with engineering, sales, and product teams to translate partner capabilities into integration requirements.

Origami Risk delivers single-platform SaaS solutions that help organizations navigate risk, insurance, compliance, and safety management. Founded by industry veterans, the company is focused on client success and offers award-winning software solutions.

Global 4w PTO

  • Design, develop, deploy, and maintain high-performance, robust, and scalable APIs using Elixir; conduct performance optimization.
  • Collaborate with cross-functional teams to define, design, and bring innovative features to life.
  • Identify and resolve issues and performance bottlenecks with existing API and integration architectures.

Arionkoder is a leading Product Development, Artificial Intelligence, and Team Augmentation studio. With a human-centric approach, they craft better futures for humanity by relying on cutting-edge technology to create impressive digital products and solutions; entrepreneurial vision and creativity are in their DNA.

India

  • Design, build, and maintain custom IAM applications, APIs, and automation that support identity lifecycle management and role-based access.
  • Partner with cybersecurity, infrastructure, and business stakeholders to translate IAM requirements into secure technical designs.
  • Engineer automated joiner, mover, leaver provisioning processes and ensure system integrations across enterprise platforms like Okta, Salesforce, and ServiceNow.

Shared Services provides identity and access management solutions for enterprise platforms. They operate in the information technology sector with a focus on secure integration patterns and operational reliability.

US Unlimited PTO 12w maternity 12w paternity

  • Develop core components on an Engineering pod with a focus on scalable backend services and RESTful APIs.
  • Measure and optimize the performance, scalability, and uptime of backend services.
  • Collaborate with product management, customer success, and support to deliver the best user experience.

Branch empowers workers with financial freedom by accelerating payments and providing accessible financial services. They are a remote-first FinTech company with a collaborative culture and employees across the U.S.

Colombia

  • Design, build, and deploy high-performance cloud systems for a cybersecurity platform.
  • Lead software capabilities from concept to production, ensuring high quality delivery.
  • Integrate solutions to improve reliability, performance, and system availability.

Coforge is a global digital services and solutions provider. We did not find information regarding employee count or culture in the job posting.

US Unlimited PTO

  • Lead post-sales technical implementation discussions with merchants, conducting deep discovery and translating findings into a clear path forward.
  • Own the technical onboarding experience from kickoff to go-live, partnering with Engineering and Product to address product gaps.
  • Establish and maintain technical documentation such as architecture diagrams and API inventories, and build reusable integration assets.

Extend provides AI-driven solutions for retailers to enhance post-purchase customer satisfaction and revenue, including automated customer service, returns, fulfillment, and fraud detection. Backed by prominent investors and headquartered in San Francisco, the company works with over 1,000 merchants across various industries.

Global

  • Design, develop, and maintain RESTful APIs to support frontend applications and enterprise integrations.
  • Develop and maintain Python-based AWS Lambda functions and optimize Amazon Connect contact flows.
  • Collaborate with cross-functional teams and Amazon Professional Services to deliver secure, scalable cloud solutions.

Miratech is a global IT services and consulting company that helps visionaries change the world by bringing together enterprise and start-up innovation. They retain nearly 1000 full-time professionals with a culture of Relentless Performance and a 99% project success rate.

  • Design and develop scalable, high-performance, low-latency backend services using Java and AWS technologies.
  • Collaborate with product, frontend, and QA teams to define technical requirements and ensure smooth integration with other platform components.
  • Optimize existing services for maximum performance, reliability, and maintainability while implementing CI/CD best practices.

Oscilar builds an advanced AI Risk Decisioning Platform that helps banks, fintechs, and digital organizations manage fraud, credit, and compliance risk. The team includes industry veterans from Meta, Uber, Citi, and Confluent, and operates with a mission-driven culture emphasizing ownership and innovation.