Senior Backend Engineer (EST Timezone)

Mosaic.tech

Mosaic.tech

Software Engineering

United States

USD 170k-220k / year

Posted on Apr 29, 2026
As a Senior Backend Engineer on the team, you’ll have a key role in developing our Payroll product and its unique features, working closely with our Product team. You are passionate about software engineering and building a product end-to-end. You will be responsible for owning the dev cycle from the technical design, through coding and testing, to deployment and monitoring. We work in a true continuous delivery environment with fully automated QA processes on a microservices architecture, deploying to production dozens of times every day.

Base salary for this role ranges from $170,000 - $220,000 per year.

There is a strong preference to fill this role in NYC with a hybrid schedule out of our office, but we will consider exceptional candidates who are based in the EST time zone and open to working remotely.

Location Eligibility: While this can be a remote position, HiBob is currently authorized to hire in the following states: CA. CO, CT, DC, FL, GA, IL, IN, KS, MA, MD, MN, NC, NH, NJ, NV, NY, OH, OK, OR, PA, RI, SC, TN, TX, UT, VA, WA. Candidates must reside in one of these states to be considered for employment.
  • 6+ years of professional experience as a software engineer, strongly emphasizing backend development.
  • Experience with Kotlin, Java, or Scala.
  • Experience owning features end-to-end.
  • Experience collaborating with product managers, exercising sound judgment on when to advocate strongly, and confidently navigating trade-offs and negotiations.
  • Experience with relational databases like PostgreSQL, MySQL, etc.
  • Excellent knowledge of software design and scalable architecture.
  • Experience with testing methodologies - unit-testing, TDD, mocking, etc.
  • Experience with AWS or an equivalent cloud platform.
  • Independent, fast learner, and excited about learning new technologies.
  • Proactive team player with a desire to impact our team, our product, and our customers.
The following is a big plus:
  • Experience developing a payroll/payments/HR product.
  • Design, develop, and maintain highly scalable back-end systems for our Payroll product using a modern microservices architecture.
  • Collaborate with product managers, front-end engineers, and other stakeholders to implement new features and ensure alignment with the overall product roadmap.
  • Write clean, maintainable, and efficient code in Kotlin, Scala, or Java (or be eager to learn Kotlin).
  • Build and optimize APIs to support seamless integrations across our platform.
  • Participate in code reviews and provide constructive feedback to team members.
  • Take ownership of the full development cycle, including technical design, implementation, testing, deployment, and monitoring.
  • Work in a continuous delivery environment with automated QA processes to ensure robust and reliable releases.