Senior Software Engineer

Zaizi

Senior engineer building secure web applications, APIs, and tactical Android integrations for UK Ministry of Defence programmes. Delivering DevSecOps pipelines and mentoring engineers in a hybrid London role.

Posted 8/4/2026full-timeLondon • 🇬🇧 United KingdomSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in building secure web applications and APIs for the Ministry of Defence, with a strong focus on Agile methodologies and adherence to MoD software development standards. Proficient in modern web stacks and Android development, ensuring compliance with security frameworks and effective system integrations.

Highest-signal resume keywords

Active UK SC ClearanceWeb Development with TypeScript, React, Node.js, or Python/FastAPIAPI Design with REST, GraphQL, gRPC, and WebSocketAndroid Development with Kotlin or JavaDatabase Design with PostgreSQL and SQLite

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Web Application DevelopmentAPI DevelopmentAndroid Background ServicesDatabase DesignMicroservices ArchitectureEvent-Driven ArchitectureSecure by Design PrinciplesContainerization AutomationMemory OptimizationThread Management

Soft Skills

MentoringCollaborationAgile Participation

Tools & Technologies

TAK/ATAKOmniTAKCursor-on-TargetK3sPodmanRoomRocksDB

Industry Keywords

MoD Software Development StandardsDef Stan 00-056ALARP Risk Management

Tech Stack

Tools & technologies

AndroidCloudGraphQLGRPCJavaJavaScriptKotlinMicroservicesNode.jsPostgresPythonReactSQLiteTypeScript

About the role

Key responsibilities & impact

Build mission-critical web applications and API backends for central MoD programmes
Contribute to low-level system integrations on tactical edge and Situational Awareness platforms
Design and build resilient, secure web applications, microservices, and APIs for cloud and hybrid MoD landing zones
Develop native Android background services, IPC/AIDL interfaces, and Cursor-on-Target data routers
Connect front-end C2 displays such as OmniTAK and ATAK to backend services
Ensure code follows MoD Secure by Design principles and Def Stan 00-056 safety boundaries
Automate build, test, and containerisation pipelines for air-gapped and enterprise cloud environments
Lead technical user stories on funded MoD statements of work
Participate in Agile delivery ceremonies
Mentor mid-level engineers

Requirements

What you’ll need

Active UK SC Clearance (minimum) with UK nationality/sovereignty requirements
Hands-on experience delivering under MoD software development standards and Secure by Design frameworks
4+ years of production experience with modern web stacks: TypeScript, React, Node.js, or Python/FastAPI
Strong API design experience with REST, GraphQL, gRPC, and WebSocket
Relational and non-relational database design, including PostgreSQL and SQLite
Proficiency in Kotlin or Java on native Android environments
Experience with Android background services, thread management, and IPC via AIDL/Binders
Understanding of event-driven architectures, local socket communication, and memory optimization under resource-constrained conditions
Desirable: experience with TAK/ATAK, WinTAK, OmniTAK, Cursor-on-Target/CoT, or STANAG 4586
Desirable: familiarity with K3s, Podman, Room, or RocksDB
Desirable: knowledge of Def Stan 00-056/00-055 and ALARP risk management

Benefits

Comp & perks

Salaries reviewed annually to ensure they reflect your performance and market value
Loyalty Pension: starting at a 5% employer contribution, increasing by 0.5% every year after the third anniversary, up to a maximum of 8%
Comprehensive Group Life Assurance
10 paid days for Reservist Military Service
25 days annual leave plus Bank Holidays
Flexibility to Buy/Sell additional days
2 paid volunteering days per year
Fully funded professional certifications (AWS, GCP, Agile, etc.)
5 days paid study leave
£500 annual "Personal Choice" fund
Access to 1-2-1 professional coaching and team training
Vitality Private Medical Insurance, including Apple Watch, gym discounts, and rewards
Genuine hybrid working
WFH equipment allowance
Cycle to Work scheme