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Principal API Platform Engineer Lamina
Lamina is seeking a Principal API Platform Engineer to join our Banking Technology team. We are a fast-growing FinTech company that is transforming how banks participate in and syndicate commercial loans. Our platform integrates with both Loan Origination Systems (LOS) and Loan Accounting Systems (LAS) streamlining data flow across the banking ecosystem.
As a Principal API Platform Engineer you will drive the strategy design and development of our external API platform. You will architect scalable secure and observable APIs that enable banks to build custom integrations with Lamina. This role combines platform architecture developer experience and deep integration expertise. You will also build internal tooling that empowers both our clients and internal teams to integrate and operate with confidence.
Responsibilities
Lead the design development and versioning of Laminas external APIs supporting integration with bank-hosted systems (LoanIQ AFS CLS).
Define API governance standards including schema validation version control rate limiting and security (OAuth2 API keys mTLS).
Architect and manage API gateway infrastructure to monitor traffic enforce policy and support scalable partner access.
Build and maintain internal tools for API payload debugging request replay schema diffing and log observability.
Collaborate with other Banking Technology team members to support external client teams during integration development and testing.
Own the internal sandbox environments test harnesses and mock services to support bank-side development.
Help guide product decisions and API roadmap in partnership with Banking Technology Product Lead.
Enable automated testing pipelines and ensure consistent quality across releases.
Skills & Requirements
Technical Expertise:
o 7 years of engineering experience including 3 years focused on designing and building partner-facing APIs.
o Deep experience with RESTful API design JSON schema OpenAPI/Swagger and Postman.
o Strong backend development skills in Python or Java.
o Experience managing APIs using platforms such as Kong Apigee or AWS API Gateway.
o Knowledge of authentication and security standards such as OAuth2 JWT and mTLS.
o Familiarity with integration patterns (batch event-driven polling) and tooling for schema validation and observability.
o Experience working with or building APIs that connect to enterprise platforms like LoanIQ AFS or CLS is highly preferred.
Platform & Tooling Expertise:
o Experience building internal developer tools integration health dashboards replay utilities and test harnesses.
o Familiarity with API lifecycle tooling and partner-facing onboarding assets (e.g. sample payloads Postman collections).
Leadership & Collaboration:
o Strong sense of ownership with ability to drive cross-functional collaboration across engineering product and solutions.
o Client-facing mindset with comfort supporting external bank teams and resolving integration issues.
o Excellent written and verbal communication skills especially in translating complex technical issues into clear actionable insights.
o Desire to operate in a fast-paced startup environment with high autonomy.
o Excited to shape the future of Laminas integration infrastructure and technical tooling.
o Able to work independently and collaboratively as part of a highly motivated team.
Bonus Points:
o Prior experience working on integration-heavy platforms in the FinTech or B2B SaaS space.
o Strong understanding of core banking or financial systems integration is a plus.
o Experience working with or integrating into Loan Accounting Systems (LoanIQ AFS CLS)
Based on pay transparency guidelines the salaryrange for this role canvary based on your proximity to one of our West Monroe offices (seetable below). Information on our competitive total rewards packageincluding our bonus structure and benefits ishere. Individual salaries are determined by evaluating a variety of factors including geographyexperience skills education and internal equity.
Employees (and their families) are covered by medical dental vision and basic life insurance. Employeesare able toenroll in our companys 401k planpurchase shares from our employee stock ownership program and be eligible toreceive annual bonuses. Employees will also receive unlimited flexible time offand ten paid holidays throughout the calendar year. Eligibility for ten weeks of paid parental leave will also be available upon hire date.
Were a global business and technology consulting firm passionate about creating measurable value for our clients delivering real-world solutions.
The combination of business and technology is not new but how we bring them together is unique. Were fluent in both. We know that technology alone is not the answer but how we apply it is. We rely on data to constantly adapt and solve new challenges. Actions that work today with outcomes that generate value for years to come.
At West Monroe we zero in on the heart of the opportunity getting to results faster and preparing people for whats next.
Youll feel the difference in how we work. We show up personally. Were right there in the room with you co-creating through the challenges. With West Monroe collaboration isnt a lofty promise but a daily action. We work together with you to turn vision into clear action with lasting impact.
West Monroeis an Equal Employment Opportunity Employer
We believe in treating each employee and applicant for employment fairly and with dignity. We base our employment decisions on merit experience and potential without regard to race color national origin sex sexual orientation gender identity marital status age religion disability veteran status or any other characteristic prohibited by federal state or local law. To learn more about diversity equity and inclusion at West Monroe visit If you require a reasonable accommodation to participate in our recruiting process please inquire by sending an email to .
Please review our current policy regarding use of generative artificial intelligence during the application process.
If you are based in California we encourage you to read West Monroes Notice at Collection for California residents provided pursuant to the California Consumer Privacy Act (CCPA) and linkedhere.
Required Experience:
Staff IC
Full Time