# Senior Software Engineer

**Company:** [Zaizi](http://jobs.workable.com/companies/vjo2y9WnsNSe8pxzwzHf1C.md)
**Location:** London, United Kingdom
**Workplace:** hybrid
**Department:** Club Jura

[Apply for this job](http://jobs.workable.com/view/509bbef3-70e3-4fa6-b63c-490648894752)

## Description

We are seeking a Senior Full Stack & Systems Engineer to join our Defence delivery team. This is a versatile, high-impact role designed for funded client delivery: you will build mission-critical web applications and API backends for central MoD programmes, while contributing to low-level system integrations (Kotlin, Android ART, IPC/AIDL) on tactical edge and Situational Awareness (TAK) platforms.

You will sit at the intersection of modern enterprise software engineering and tactical edge integration, ensuring all code meets MoD **Secure by Design (SbD)** principles and **Def Stan 00-056** safety boundaries.

## Requirements

-   **Full-Stack Application Development:** Design and build resilient, secure web applications, microservices, and APIs (TypeScript, Node.js, React, or Python) for cloud and hybrid MoD landing zones.
-   **Edge & Tactical Systems Integration:** Develop native Android background services (Kotlin on ART), IPC/AIDL interfaces, and Cursor-on-Target (CoT) data routers connecting front-end C2 displays (e.g., OmniTAK, ATAK) to backend services.
-   **Secure by Design (SbD) Implementation:** Write clean, well-tested code following NCSC Secure Development Principles, NCSC Cloud Security Guidance, and JSP 440 controls.
-   **CI/CD & DevSecOps:** Automate build, test, and containerisation pipelines (Docker, GitOps, GitLab CI/GitHub Actions) for both air-gapped systems and enterprise cloud environments.
-   **Client Delivery & Mentorship:** Lead technical user stories on funded MoD statements of work (SoWs), participate in Agile delivery ceremonies, and mentor mid-level engineers.

**Required Qualifications & Experience**  
1\. **Defence & Security Baseline**  

-   Active UK SC Clearance (minimum) with UK nationality/sovereignty requirements.
-   Hands-on experience delivering under MoD software development standards and **Secure by Design (SbD)** frameworks.

2\. **Full-Stack Engineering (Web & APIs)**  

-   4+ years of production experience with modern Web stacks (TypeScript, React, Node.js, or Python/FastAPI).
-   Strong API design experience (REST, GraphQL, gRPC, WebSocket) and relational/non-relational database design (PostgreSQL, SQLite).

3\. **Systems & Mobile Architecture (Android ART)**  

-   Proficiency in **Kotlin** or **Java** on native Android environments, including background services, thread management, and Inter-Process Communication (IPC via AIDL/Binders).
-   Understanding of event-driven architectures, local socket communication, and memory optimization under resource-constrained conditions.

**Desirable / Bonus Qualifications**  

-   Experience with tactical mapping frameworks (TAK/ATAK, WinTAK, OmniTAK) or military telemetry protocols (Cursor-on-Target / CoT, STANAG 4586).
-   Familiarity with containerisation at the edge (K3s, Podman) or local database layers (Room, RocksDB).
-   Knowledge of Defence safety standards (**Def Stan 00-056 / 00-055**) and ALARP risk management.

## Benefits

-   **Competitive Pay:** Salaries reviewed annually to ensure they reflect your performance and market value.
-   **Loyalty Pension:** We invest in your future. Starting at a 5% employer contribution, we increase this by 0.5% every year after your third anniversary, up to a **maximum of 8%**.
-   **Protection:** Comprehensive Group Life Assurance for peace of mind.

**Purpose & Culture**

-   **Real Impact:** Work on mission-critical projects that secure and improve the UK's digital infrastructure.
-   **Autonomy:** A culture that empowers you to make decisions, prototype rapidly, and iterate towards success.
-   **Service & Community:** We support those who serve. **10 paid days** for Reservist Military Service.

**Work / Life Balance**

-   **Time Off:** **25 days annual leave** + Bank Holidays, with the flexibility to Buy/Sell additional days to suit your lifestyle.
-   **Giving back:** 2 paid volunteering days per year.

**Development & Growth**

-   **Master Your Craft:** Fully funded professional certifications (AWS, GCP, Agile, etc.) supported by **5 days paid study leave**.
-   **Expand Your Horizons:** An additional £500 annual "Personal Choice" fund to learn whatever inspires you—work-related or not.
-   **Support:** Access to 1-2-1 professional coaching and team training to accelerate your career.

**Health & Balance**

-   **Premium Health:** Vitality Private Medical Insurance (includes Apple Watch, gym discounts, and rewards).
-   **Flexibility:** Genuine hybrid working with a WFH equipment allowance to perfect your home setup.

-   **Wellbeing:** Cycle to Work scheme and a commitment to sustainable, healthy working practices.