Senior Software Engineer - Universal Search

Mark43; Manchester; Hybrid; GBP 70,000 - 110,000; Full time

Benefits offered by this job

28 days holiday plus UK bank holidays

Private medical, dental, and vision AX

18 weeks paid parental leave

Pension through Nest

Gym reimbursement

Equipment home-office allowance

AI tooling licenses (Claude Code, Chat

Spring Health mental wellness

Company performance-based bonus

Sabbatical after 5 years

Job summary

Mark43, based in Manchester, seeks an experienced Senior Software Engineer to lead the Universal Search platform. You will own complex initiatives across third‑party integrations, real‑time query routing, and deployment strategies within a distributed cloud environment.

You will collaborate with CAD, RMS, and analytics teams, shaping platform direction and driving high standards in security, observability, and reliability. Hybrid work in Manchester is required.

Qualifications

• 5+ years of professional software engineering experience in distributed systems
• Experience with Java 17+/Spring Boot and React/TypeScript in production
• Experience integrating with third‑party systems via REST, SOAP/XML and messaging
• Experience building real‑time systems with WebSockets and scalable architectures
• Hands‑on with AWS services, MySQL and caching (Redis)
• Knowledge of resilience patterns, CI/CD, containers and Kubernetes
• Strong design, debugging and code-review skills; able to mentor teams
• Familiar with AI-assisted development tools and secure, observable software

Responsibilities

• Design and deliver external provider integrations (e.g., UK PNC/third‑party APIs)
• Evolve real-time query pipelines and WebSocket streaming to CAD/RMS users
• Extend configuration-driven platform for multi-agency onboarding
• Review designs and PRs across Java services, Lambda, and React frontend
• Coordinate releases across CAD, RMS and OnScene with feature flags and dependencies
• Improve observability, tracing, and logging to prevent data leaks
• Mentor engineers and drive intelligent adoption of AI-assisted development
• Contribute to on-call rotations and RCA follow-ups for resilience

Skills

Java 17+

Spring Boot

React

TypeScript

REST/SOAP/XML

WebSockets

AWS (Lambda, DynamoDB, S3, IAM)

MySQL

Redis

CI/CD

Kubernetes

Testcontainers

LocalStack

Claude Code

Tools

Datadog

Terraform

OpenAPI/contract driving

Claude Code Enterprise

OpenAPI/Code generation

Job description

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.

Mark43's mission is to empower communities and their governments with new technologies that improve safety and quality of life for all. We build powerful, scalable, and elegant software that sets a new standard for the tools on which first responders rely. Our users are diverse, and we are committed to embracing diversity of thought and experience within our team.

We are looking for an experienced Senior Software Engineer - Universal Search to lead the next phase of our third‑party search and data integration platform at Mark43. In this role, you will own some of the most complex and impactful technical initiatives within the Universal Search domain, building and scaling the systems that power fast, accurate, secure access to critical data across our RMS, CAD, and analytics products. You will drive architecture across service boundaries, shape platform direction with cross‑functional partners, and raise technical standards for distributed systems, real‑time indexing, authorization‑aware retrieval, and search reliability in support of life‑saving decision‑making for public safety users.

What You’ll Do

• Led the design of a new external provider integration, such as a UK PNC connection or a commercial person‑search API. You worked through authentication, request mapping, partial and error responses, and result normalisation, then wrote it up as a design doc and spec before breaking it into deliverable tasks.
• Evolved our real‑time query pipeline: the Lambda functions that route queries, and the WebSocket layer that streams results to users. You improved how query state, read status and partial results reach CAD and RMS clients.
• Extended our configuration‑driven platform. That means versioned, per‑department configurations, bundles and rule handlers that let us onboard a new agency or state system without one‑off code, and promote those configurations safely across environments.
• Reviewed designs and pull requests across the Java services, Lambda functions and React micro‑frontend. You gave clear, high‑impact feedback on resilience, data handling and contract design.
• Coordinated a release spanning several services and product teams (CAD, RMS, OnScene), managing feature flags, dependencies and rollout to minimise customer impact.
• Improved observability: propagated correlation and trace IDs across service and provider boundaries, added Datadog metrics and alerts, and made sure no PII or criminal justice data leaks into logs.
• Mentored engineers through ambiguous technical decisions and helped the team make effective, safe use of AI‑assisted development and review tooling.
• Took part in on‑call, diagnosed a spike in failed provider queries, led the Root Cause Analysis (RCA), and drove follow‑up improvements to resilience, alerting and runbooks.

What You’ll Need

We are looking for a senior engineer with 8+ years of professional software engineering experience. You should be able to lead large, ambiguous initiatives on your own, influence decisions beyond your immediate team, and take strong ownership in a distributed, integration‑heavy environment.

Must Haves

• Strong proficiency in modern Java (17+, ideally 21) and Spring Boot, plus working full‑stack skills in React and TypeScript, and a track record of production‑ready, well‑tested, maintainable code.
• Significant experience integrating with third‑party systems over varied protocols and formats, such as REST, SOAP/XML and message queues, including handling unreliable upstreams, partial results and inconsistent data.
• Experience building real‑time systems with WebSockets: connection lifecycle and session management, scaling across multiple instances, reconnection and delivery guarantees, and pushing live updates to web and mobile clients.
• Hands‑on experience with AWS (Lambda, Secrets Manager, AppConfig, DynamoDB, S3, IAM, CloudWatch), relational databases (MySQL) and caching (Redis).
• Solid understanding of data mapping and normalisation: turning heterogeneous source schemas into a consistent, well‑defined contract.
• Experience with resilience patterns such as circuit breakers, retries, timeouts and graceful degradation.
• Comfort delivering through CI/CD, containers and Kubernetes, with integration‑first testing (e.g. Testcontainers, LocalStack).
• Strong system design skills: services and APIs built for scale, incremental delivery and a low long‑term cost of change.
• A track record of leading multi‑engineer projects, spotting dependencies early and delivering in ambiguity.
• Effective use of AI‑assisted development (we use Claude Code across development and code review) to deliver faster without lowering standards for quality or security.
• Excellent written and verbal communication, including clear design documents and the ability to influence technical and non‑technical stakeholders.
• Proven mentorship and technical leadership; a go‑to engineer for complex debugging and design reviews.

Nice to Haves

• Experience with public safety or criminal justice data systems, such as PNC, NCIC or state message switches, or standards such as NIEM.
• Experience with micro‑frontends / Module Federation, or OpenAPI‑driven contract and code generation.
• Experience with Terraform or other Infrastructure‑as‑Code, and with Datadog.
• Knowledge of security best practices for sensitive data: authorisation, auditability, encryption, PII handling and data residency.
• Experience owning platform capabilities used by multiple teams, tenants or jurisdictions.

People Who Thrive in This Role Also Tend to Be

• Mission‑driven: You care deeply about building technology that improves lives and strengthens communities.
• Curious and humble: You seek out different perspectives, ask thoughtful questions, and influence through credibility rather than job title.
• Team‑oriented: You collaborate effectively across engineering, product, design, infrastructure, and support to deliver lasting outcomes.
• Growth‑minded: You invest in your own development and actively help develop the engineers around you.
• Calm under uncertainty: You can make sound decisions, manage risk, and keep delivery moving even when requirements or circumstances are evolving.

What We Offer

• 28 days holiday plus UK bank holidays
• Private medical, dental, and vision insurance through AXA Health and BUPA, fully paid for you and your dependents
• 18 weeks paid parental leave for primary caregivers plus a ramp‑back programme
• Income protection (75% of salary) and death in service cover (4x salary), fully paid
• Pension through Nest with 3% employer contribution
• Gym reimbursement for you and your partner
• Equipment allowance to set up your home office
• AI tooling including Claude Code Enterprise and ChatGPT Enterprise licences provided
• Spring Health membership with therapy sessions and mental wellness tools, fully covered
• Company performance‑based bonus
• Paid sabbatical of one month at your five‑year anniversary
• Biannual hackathons, learning budget, and a team that genuinely invests in your growth

What We Value

• Humility. You know the best ideas win, no matter where they come from. You ask questions before making assumptions and you're as happy being wrong as being right, because either way, the team gets to a better answer.
• Inclusivity. You respect expertise in all its forms and actively seek out perspectives different from your own. You make space for others and assume good intent.
• Excellence. You care about quality in your code, your reviews, and how you communicate. You're not satisfied with "it works" when it could be better, and you encourage the same standard in those around you.
• Diligence. You take ownership, mind the details, and understand that the software we build is used in moments that genuinely matter. You don't cut corners when people are depending on the outcome.

Location

This role is based at our Manchester office and follows a hybrid work model with at least three days a week in the office.

Applicants must be authorised to work in the UK. We are unable to sponsor or take over sponsorship of an employment visa at this time.

This role may require you to complete Non‑Police Personnel Vetting (NPPV) security clearance up to level 3.

Mark43 is approved to hire in Canada, the UK, and 36 U.S. states, including Alabama, Arizona, California (excluding San Francisco), Colorado, Connecticut, Washington D.C., Florida, Georgia, Iowa, Idaho, Illinois, Indiana, Kansas, Massachusetts, Maryland, Maine, Michigan, Minnesota, Missouri, North Carolina, Nebraska, New Hampshire, New Jersey, New Mexico, New York, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, Tennessee, Texas, Utah, Virginia, Vermont, Washington, Wisconsin, and West Virginia. Before applying to a remote role, please ensure that you are able to perform the position in one of the states listed above. State locations and specifics are subject to change as our hiring requirements shift.

Our Privacy Notice describes how Mark43 uses and protects the personal information of prospective employees during the recruitment process. It informs you about our handling of the personal information you provide to us when you apply for a position in our organization and in general when you express your interest in joining our team.

As a part of Mark43's security measures all employees must: Engage in appropriate use of the company's electronic information resources; Become knowledgeable about and follow relevant security policies and guidelines; Protect the resources under their control, such as passwords, computers, and data that they create, receive, or download; and Promptly report security‑related incidents and violations, and responding to official reports of security incidents involving their systems or accounts.

Mark43 is committed to the full inclusion of all qualified individuals. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex disability, age, sexual orientation, gender identity, national origin, veteran status, or genetic information. As part of this commitment, we will ensure that persons with disabilities are provided reasonable accommodations. If reasonable accommodation is needed, please email [e-mail] requesting the accommodation.