Backend Software Engineer

ExTrac

. Build and own features, components, and APIs end to end within a single system .

Posted 9/30/2026full-timeLondon • United KingdomJuniorMid-Level💰 £75,000 - £80,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Proficient in building and maintaining Go and Python-based microservices, with a strong focus on system design, API development, and performance optimization. Demonstrates effective collaboration with cross-functional teams and a commitment to incorporating user feedback into product development.

Highest-signal resume keywords

Go Microservices DevelopmentPython Microservices DevelopmentAPI DevelopmentCloud InfrastructureCI/CD Pipelines

ATS Keywords

Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills

MicroservicesSystem DesignAPI DevelopmentDatabase OptimizationData Streaming PipelinesTechnical DocumentationSoftware Engineering PatternsFeature FlagsTrunk-Based DevelopmentObservability

Soft Skills

Strong CommunicationCollaboration Skills

Tools & Technologies

ElasticsearchPostgreSQLInfrastructure as Code

Certifications & Qualifications

UK Security Clearance Eligibility

Industry Keywords

Defence SoftwareGovernment SoftwareCompliance-Constrained Environments

Tech Stack

Tools & technologies

CloudElasticSearchMicroservicesPostgresPythonGo

About the role

Key responsibilities & impact

Build and own features, components, and APIs end to end within a single system
Contribute to system design and architecture discussions
Build and maintain APIs used by internal teams and customers
Develop Go and Python-based microservices for data collection, processing, and querying
Ensure services meet production standards for latency, cost, and reliability
Build instrumentation to monitor service performance
Build and operate high-throughput data streaming pipelines
Improve pipeline scalability, robustness, and latency
Optimise databases and index performance
Work directly with analysts to turn practical product feedback into system changes
Iterate on product requests and identify conflicts with longer-term platform work
Partner with AI and frontend teams on cross-functional features
Contribute to deployment pipelines, service templates, observability, and engineering environments

Requirements

What you’ll need

Applicants must be eligible to obtain UK security clearance
Applicants must be nationals of a NATO member state, Australia, or New Zealand
2+ years of professional software engineering experience
Demonstrated ability to build and ship production-grade services
Experience owning features or components end to end within a larger system
Proficiency in building microservices using Go or Python, with ability to pick up the other quickly
Practical understanding of software engineering patterns
Strong communication and collaboration skills
Comfortable writing clear technical documentation and discussing requirements with engineering and wider team colleagues
Interest in deployment pipelines, database behaviour, and security engineering
Interest in product usage and willingness to incorporate analyst feedback into requirements discussions
Experience with Go-based microservices is desirable
Experience with Elasticsearch and/or PostgreSQL is desirable
Experience with cloud infrastructure, infrastructure as code, and CI/CD pipelines is desirable
Experience with streaming or event-driven pipelines is desirable
Experience with feature flags and trunk-based development is desirable
Experience in defence, government, or other compliance-constrained software environments is desirable

Benefits

Comp & perks

Private Medical Health Insurance
Enhanced pension contributions
Enhanced parental leave
Workplace nursery scheme
£500/year education budget
More expensive educational items such as conferences covered with manager approval
33 days of leave across the year inclusive of bank holidays
Flexible working
Opportunity to spend up to 3 days a week remotely
Regular days with the team in the central London office