Senior Backend Engineer

TEKsystems is seeking an accomplished server-side Kotlin API developer to work at a major financial institution in the Phoenix area as Hybrid On-Site .(Relocation ok). This is a long term, Multi-year greenfield development project effort, beginning as W2 contract with strong likelihood for Perm hire FTE conversion based on performance. TEKsystems' Client is willing to significantly exceed the stated pay range (both hourly and for perm base salary) directly related to amount of hands on Kotlin API experience thus far in your career. Please include desired pay range with application.

Description

Role: Senior Backend Engineer (Kotlin)

Location: Phoenix, AZ

Duration: Long term W2 contract - to - likely perm hire FTE conversion

Group Overview

This team develops software products and platforms that support Small Business, Mid‑Market, Large Market, and Global Commercial clients worldwide. Our mission is to strengthen payments by delivering modern, digital‑first experiences across acquisition, onboarding, servicing, lending, B2B payments, remittance processing, and commercial data.

Team Overview

The team builds and owns shared service APIs and orchestration platforms that power card issuance, card management, and servicing across multiple products and markets. The team plays a foundational role in abstracting legacy complexity, enabling platform reuse, and supporting a high‑visibility, mission‑critical modernization initiative focused on evolving how commercial card capabilities are delivered across the enterprise.

Role Overview

We are seeking a Senior Backend Engineer with **strong Kotlin expertise** to help design and build modern, cloud‑native services that progressively replace legacy middleware and service platforms.

This role supports a multi‑year modernization initiative with clear decommissioning goals. The ideal candidate is comfortable navigating complex legacy systems while designing clean, reusable APIs that will serve as long‑term platform foundations.

You will act as a keeper of the codebase for key services, owning technical quality, influencing architectural direction, and partnering closely with product and platform teams to deliver scalable, enterprise‑grade solutions within a mission‑critical payments ecosystem.

How You’ll Make an Impact

- Design, develop, test, and maintain Kotlin‑based backend services and APIs

- Support the decommissioning of legacy middleware platforms and SOAP‑based services

- Translate and extract legacy functionality into modern REST‑based, cloud‑native APIs

- Build new and modern orchestration layers that simplify complex card issuance and servicing workflows

- Collaborate closely with Product, Architecture, and Platform teams supporting a high‑priority commercial platform

- Architect scalable, secure, and highly available distributed systems

- Contribute to CI/CD pipelines, automation, deployment strategies, and system observability

- Participate in code reviews, automated testing, and engineering best practices

- Mentor junior engineers and influence technical direction across the team

- Help define long‑term platform strategy, modernization roadmaps, and architectural patterns

Required Qualifications

- 6+ years of backend software engineering experience in large‑scale enterprise environments

- Strong proficiency in Kotlin for API and service development (solid JVM background required)

- Hands‑on experience designing and working with REST and SOAP APIs, including XML and JSON

- Experience with distributed, multi‑tiered, asynchronous systems

- Public cloud experience, ideally AWS

- Experience with CI/CD pipelines (GitHub Actions, Jenkins)

- Strong experience with relational and/or NoSQL databases (Aurora, Postgres, SQL / NoSQL)

- Experience working in Agile environments with code reviews and automated testing

Skills

Kotlin, API, SOAP, REST, Microservices, Aws, Java, SQL, postgresql

Top Skills Details

Kotlin,API,SOAP,REST,Microservices,Aws,Java,SQL,postgresql

Additional Skills & Qualifications

Experience That Sets You Apart:

Prior work on system modernization, uplift, or decommissioning initiatives

Experience navigating legacy middleware or integration platforms

background in financial services, payments, or platforms

Experience owning shared services or platform APIs used by multiple teams

Comfort influencing architecture and pushing back on unclear or incomplete requirements

Comfort using AI‑powered development tools to accelerate delivery and improve code quality

Non‑Technical Traits We Value:

Strong engineering fundamentals — smart, thoughtful engineers who understand core backend principles

Ownership & initiative — able to take an open‑ended problem and run with it independently

Leadership potential — interest and ability to grow into a technical lead role over time

Customer experience mindset — always thinking about how systems and APIs can deliver better outcomes

Creative and curious — brings new ideas, challenges assumptions, and looks for ways to improve

Clear communicator — able to explain technical decisions and trade‑offs to both technical and non‑technical partners

Experience Level

Senior Level

This is a Contract to Hire position based out of Phoenix, AZ.

The pay range for this position is $60.00 - $64.00/hr.

Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following:
• Medical, dental & vision
• Critical Illness, Accident, and Hospital
• 401(k) Retirement Plan – Pre-tax and Roth post-tax contributions available
• Life Insurance (Voluntary Life & AD&D for the employee and dependents)
• Short and long-term disability
• Health Spending Account (HSA)
• Transportation benefits
• Employee Assistance Program
• Time Off/Leave (PTO, Vacation or Sick Leave)

This is a hybrid position in Phoenix,AZ.

This position is anticipated to close on May 8, 2026.

We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change. That's the power of true partnership. TEKsystems is an Allegis Group company.

The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

We’re a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We’re a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed. We’re strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. We’re building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at TEKsystems.com.

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.