Senior Software Engineer

About Mark43 

Mark43 empowers communities and their governments with technology that improves safety and quality of life. We build modern, resilient software that first responders and public safety agencies depend on in their most critical moments.

We are looking for an experienced Senior Software Engineer – Universal Search to help shape the future of 3^rd party search and data integration at Mark43. In this role, you’ll build and scale the systems behind our universal search platform that powers fast, accurate, and secure access to critical data across our RMS, CAD, and analytics products. You'll work on distributed systems, real-time data indexing, and modern search technologies to support life-saving decision making for our public safety users.

Applicants must be authorized to work for any employer in the country in which the role is being hired. We are unable to sponsor or take over sponsorship of an employment visa at this time.

What You’ll Do

If you were on our team last week, you might have:

• Led end-to-end system design for a new universal search experience across RMS, CAD, and other core components, collaborating with Product and cross-functional engineering teams to ensure a scalable, secure, and user-friendly solution that spans domains.


• Extended platform configurability and connectivity to tap new search data sources using AI-powered coding tools to accelerate development while maintaining high standards for code quality.


• Reviewed pull requests for enhancements to our authorization layer and index mappings in configurations, providing detailed architectural and performance-focused feedback to improve clarity, maintainability, and system resilience.


• Acted as release manager, coordinating deployment logistics, validating release readiness, and ensuring smooth, downtime-free updates to production through clear cross-team communication.


• Owned the end-to-end delivery of a feature supporting permission-aware global search filtering, aligning closely with Product, Infrastructure, and Design from technical feasibility through post-release monitoring.


• Mentored junior engineers, pair-programmed through complex debugging sessions, and coached teammates on prioritizing technical debt while delivering roadmap commitments.


• Participated in the on-call rotation, triaged and resolved a spike in failed search queries, and led a structured Root Cause Analysis (RCA) to drive follow-up improvements in system observability and alerting.

What You’ll Need

We’re looking for a senior backend engineer with at least 4+ years of professional experience who can take ownership, lead initiatives, and operate with autonomy in a distributed systems environment.

Must-Haves:

• Proficiency in Java or TypeScript/JavaScript with strong backend development experience.


• Experience integrating and working with third-party systems to support search functionality across domains.


• Familiarity with event-driven architectures using Amazon SNS, Amazon SQS, or Kinesis.


• Strong experience with AWS services such as Lambda, API Gateway, Step Functions, S3, ECS/EKS, DynamoDB, Aurora/RDS, IAM, and CloudWatch.


• Prior experience using AI engines to increase development velocity and deliver results


• Solid understanding of indexing strategies, document schema design, and query optimization.


• Comfort working with CI/CD workflows and Infrastructure-as-Code (IaC) tools in a serverless-first, microservices-based architecture.


• Excellent written and verbal communication skills.

Nice to Have:

• Prior experience working on multi-tenant platforms or large-scale search products.


• Familiarity with public safety or regulated domains.


• Knowledge of security best practices around data access and query auditing.

People Who Thrive on Our Team Also Tend to Be:

• Mission-driven – You care deeply about building technology that improves lives and strengthens communities


• Curious and humble – You ask questions before making assumptions and actively seek feedback


• Team-oriented – You value cross-functional collaboration as a key to shipping great software


• Growth-minded – You look for ways to improve every day, even if the path isn’t always clear


• Calm under uncertainty – You’re comfortable navigating ambiguity and solving problems without a roadmap

Location:

This role is based in our Manchester, UK office and follows a hybrid work model. Team members are expected to be in the office at least three days per week to foster strong collaboration and a connected team environment.