Sr Software Engineer, API

The Sr Software Engineer, API, develops, maintains, and documents the APIs, and ensures they meet the needs of the business. The Sr Software Engineer - API will work closely with diverse teams, including developers, product managers, and external partners, to deliver high-quality API solutions that drive business growth and enhance customer experience.

Key Responsibilities

Design, develop, and maintain robust, scalable, and high-performance APIs using the .NET framework.

Integrate various systems and services, ensuring seamless data flow and interoperability.

Write clean, maintainable, and efficient code while adhering to leading practices and coding standards.

Identify and address performance bottlenecks, ensuring optimal performance and scalability of APIs.

Create and maintain comprehensive technical documentation for APIs, including usage guides and API references.

Collaborate with front-end developers, product managers, and other key partners to understand requirements and deliver effective solutions.

Provide guidance and mentorship to less experienced developers, helping them to improve their skills and code quality.

Develop and implement unit tests, integration tests, and other automated tests to ensure the reliability and stability of the APIs.

Implement security standard protocols to protect data and ensure secure API access.

Diagnose and resolve technical issues, providing support and maintenance as needed.

Stay up to date with the latest industry trends and technologies, continuously seeking ways to improve processes and tools.

Education & Experience

Bachelor’s Degree in Computer Science or related field, or equivalent work experience

6+ years of professional experience in API development and management using .NET Framework.

Demonstrated experience with API management platforms (e.g., Azure API Management, AWS API Gateway, Mulesoft).

Experience in designing and implementing RESTful APIs.

Proficiency in programming languages such as C#, Java, Python, Node.js.

Experience with ASP.NET Web API or similar frameworks.

Solid understanding of API security, including OAuth, JWT, and other authentication mechanisms.

Experience with cloud services and infrastructure (Azure preferred, AWS, Google Cloud).

Familiarity with database technologies such as SQL Server, Entity Framework, and ORM tools.

Experience integrating with and maintaining connections with third-party libraries, SDKs, Webhooks, and APIs.

Familiarity with Ruby on Rails is a Plus.

Experience writing and running test suites with CI/CD, including test automation, unit test level TDD, and SAST/DAST.

Experience building financial solutions such as trading platforms, digital wallets, and payment solutions is desirable.

Experience working in a highly regulated industry, managing the secure transit and storage of sensitive data.

Knowledge, Skills & Abilities

Working knowledge of SDLC methodologies with a focus on Agile and Scrum.

Knowledge of DevOps practices and tools (CI/CD, Docker, Azure Kubernetes Services).

Adaptability to work within constraints of existing technology stack, while leading continuous improvement initiatives. Willingness to learn new technologies and methodologies.

Strong organizational, multi-tasking, and problem-solving skills, both within and across teams.

Excellent communications skills.

Location & Travel Expectations

Our corporate headquarters is in Bellevue, WA, but this position offers the flexibility to work remotely from anywhere within the U.S.

This position requires some business travel.

Pay and Benefits

The typical starting salary range for this position is between $133,801-$167,251 per year. Coinstar utilizes geographically based pay ranges, within the United States, which allows us to pay competitively and consistently based on location. Within the range for the applicable geographic area, individual pay is determined by several factors, including job-related skills, experience, and relevant education or training. Your recruiter can share the salary range specific to your location. Employees in this position have the potential to increase their base salary up to $200,702 per year, which is the max end of the range, based on ongoing demonstrated and continuous performance in the role. Short-Term and Long-Term bonus incentives are a part of the total compensation package and are based on Company and Individual performance.

We believe that continued good health, financial security, and work-life balance are important. Coinstar is proud to offer a complete, progressive benefits package including:

Health & Wellness Coverage – Three outstanding medical plans to choose from, along with dental and vision insurance, Short- and Long-Term Disability Insurance, and Life Insurance.

Retirement Savings – Traditional and Roth 401(k) plans with a company match that immediately vests.

Paid Time-Off – PTO accruals begin at 18 days per year, plus 10 company holidays and 2 floating holidays annually. Additionally, we offer paid parental and adoption leave.

Other Perks and Benefits – A generous Corporate Matched Giving plan and an Employee Assistance Program.

Work Environment – We offer a casual and flexible work environment with work from home options.

EEO

We are Coinstar because of our people. We value and embrace their unique and diverse talents, perspectives and experiences and strive to build an environment where everyone can bring their best self to work. We are an Equal Opportunity Employer. Coinstar will ensure that persons with disabilities are provided with reasonable accommodations. If reasonable accommodation is needed, please contact our Human Resources team via . We believe that diversity and inclusion make us a better, more innovative, and successful company, and we seek to recruit and retain a diverse talent pool. Even if you do not meet every qualification, we encourage you to apply.

Physical Requirements

Sedentary work involves remaining in a stationary position most of the time in front of a computer, using a keyboard, mouse and telephone. Regularly operate a computer and other office equipment. Occasionally move about the work site to access file cabinets, office equipment, etc. Exert up to 10 lbs. of force occasionally, and/or a negligible amount of force frequently or regularly move objects. Communicate and exchange information with co-workers and other individuals in person and electronically.

This job description is not intended to be all-inclusive. Employee may perform other related duties as assigned to meet the ongoing needs of the organization.