Senior Mainframe Developer Jobs in Idaho

INTRODUCTION

Is it surprising to hear that a financial institution of 1.5 million members and over $30 billion in managed assets say that success comes from focusing on people, not profits?
Our “people helping people” philosophy has guided us since 1935, driving our deep commitment to serving our members, communities, and each other. When you join our team, you become part of a purpose-driven organization where your work makes a real difference.
While we’re proud of our history, we’re even more excited about our future. With business and technology transformation on the horizon, there’s never been a better time to be part of BECU.

PAY RANGE

The Target Pay Range for this position is $141,800.00-$173,300.00 annually. The full Pay Range is $110,100.00 - $204,900.00 annually. At BECU, compensation decisions are determined using factors such as relevant job-related skills, experience, and education or training. Should an offer for employment be made, we will consider individual qualifications. In addition to your salary, compensation incentives are available for the hired applicant. Incentives are performance based and targets vary by role.

BENEFITS – because people helping people starts with supporting you

• 401(k) Company Match (up to 3%)
• 4% annual contribution to your 401(k) by BECU
• Medical, Dental and Vision (family contributions as well)
• PTO Program + Exchange Program
• Tuition Reimbursement Program
• BECU Cares volunteer time off + donation match

IMPACT YOU’LL MAKE:

In this role, you’ll strengthen BECU’s engineering capabilities by designing and delivering scalable, secure software that directly enhances the digital experiences our members rely on. You’ll apply engineering rigor, architectural thinking, and hands‑on development leadership to accelerate MDX priorities. You’ll shape how we build systems, mentor developers, and influence engineering standards across the organization. Your work will improve reliability, performance, and long-term technical health across our platforms. Through your contributions, you’ll help advance BECU’s mission to improve the financial well‑being of our members.

To join our dynamic team, we require candidates to be residents of WA, OR, ID, AZ, TX, GA, SC, NC, CA or VA. If you’re located in Washington state and within a reasonable driving distance from Tukwila, we are requesting that you come into our HQ on Tuesdays & Wednesdays. For those candidates that live outside the commute distance of TFC and in any of our approved remote work locations, this role will be remote. Remote or onsite, we are committed to ensuring you are fully engaged and included in our collaborative environment.

WHAT YOU’LL DO:

• Design & Develop Software: Build scalable, resilient, and secure services while developing prototypes, proofs of concept, and production‑ready features using modern engineering practices.
• Lead Engineering Workstreams: Guide small to medium teams through designing, building, testing, and delivering system components and services.
• Drive Code Quality: Model BECU’s coding standards, provide thorough code reviews, and champion clean, maintainable design principles.
• Implement Technical Improvements: Identify opportunities to modernize design, code, and system structure, and drive enhancements—including greenfield initiatives.
• Contribute to Architecture: Collaborate with architects and product owners to define technical direction, roadmaps, and long‑term engineering strategy.
• Mentor & Develop Others: Coach junior developers and SDETs through pairing, feedback, and knowledge‑sharing.
• Automate & Optimize: Lead automation and process‑streamlining efforts that support operational excellence.
• Collaborate & Communicate: Share technical insights across engineering teams and clearly communicate complex concepts to technical stakeholders.
• Ensure Secure Development: Apply secure coding practices and use static analysis tools to identify and resolve vulnerabilities.
• Own the Full SDLC: Contribute to analysis, design, coding, debugging, testing, documentation, and operational hand‑off.
• Work With Data Systems: Build and maintain data models, database scripts, and migrations; develop solutions for large datasets and analytics workflows.

This isn’t just about ticking off tasks on a list. It's about making a significant, positive change in BECU’s journey, where your contributions are valued, and your growth is continually fostered.

WHAT YOU’LL GAIN:

• A meaningful voice in shaping engineering direction, patterns, and best practices across the organization.
• Opportunities to lead, mentor, and build the capabilities of fellow developers.
• Close collaboration with architects, product owners, analysts, and cross‑functional technical partners.
• Exposure to cloud‑native technologies, CI/CD, automation, observability, and distributed systems.
• Work that supports member‑first digital experiences and aligns with BECU’s mission‑driven purpose.
• Freedom to explore, prototype, and influence emerging technologies and engineering approaches.
• A culture that invests in continuous learning and technical growth.

QUALIFICATIONS:

Minimum Qualifications:

• Bachelor’s degree in Computer Science or related discipline, or equivalent work experience required.
• Minimum five years of experience designing software and writing production code in a team environment required.
• Deep understanding of Secure Development best practices, demonstrated by regular use of static code analysis tools to explain and correct secure coding flaws required.
• Proven ability to deliver highly scalable solutions in multiple programming languages and technical environments over the entire product lifecycle (from ideation to retirement) required.
• Demonstrated expertise with one of the following required: .NET, C#, node.js and modern JavaScript Frameworks in TypeScript or JavaScript (React, Angular, etc.), or Python.
• System administration and automation with PowerShell or bash required.
• Knowledge of Open Source (OSS) technologies and libraries required.
• Experience with public cloud (Azure/AWS/Google Cloud) technologies required.
• Deep experience in one of the following domains: server-side web dev, modern client-side web dev, REST/web services, large scale data analytics using Machine Learning frameworks, networking, and service mesh required.
• Expertise with SOLID design principles, Object-Oriented Programming and Design required.
• Experience with SOA patterns and distributed systems design required.
• Expertise with Continuous Integration and Continuous Delivery systems/tools such as Azure DevOps Services, GitHub Actions, Jenkins, or TeamCity.
• Proficiency at building build/deployment pipelines in YAML required.
• Deep expertise in Test Driven Development concepts, methods, and tools.
• Demonstrated experience in unit testing, integration testing or performance/load testing required.
• Experience using git, including code reviews, pull requests, and branching standards such as Git Flow or Trunk-Based Development required.
• Experience presenting in front of technically adept audiences required.
• Experience with SQL, large datasets, data warehousing and sophisticated ETL processes, analytics engines required.
• Proven ability to stay current with emerging technologies and applications through work or continuing education required.
• Proven experience leading and collaborating within teams, including business unit teams, through all aspects of the SDLC required.
• Proficient verbal and written communication skills required.
• Full time hours required.

Desired Qualifications:

• Knowledge of cloud‑hosted SQL‑based data stores and NoSQL systems preferred.
• Experience with full‑stack development across both front‑end and back‑end technologies preferred.
• Web & Service development experience using .NET, C#, ASP.NET, MVC, and .NET Core preferred.
• Experience with .NET and Java Spring Boot for service/API development preferred.
• Experience with mobile technologies, including Angular, React Native, Flutter, Kotlin, and Java (Android) preferred.
• Experience working as a Full‑Stack Senior Developer across modern UI frameworks, APIs, and database systems preferred.

JOIN THE JOURNEY

Ready to make an indelible impact? Eager to be a part of a collaborative and innovative team where your ideas and contributions don’t just fill a role, but fuel the growth and success of BECU?

BECU is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, veteran status, disability, sexual orientation, gender identity, or any other protected status.