Full Stack Engineer

Convergent

Remote United Kingdom Full-time

Description

This is a high-impact, foundational role in a fast-paced, high-stakes environment. As one of our first engineers, you’re not just building features—you’re building core parts of the product and the systems behind them. Your mission is to transform powerful generative AI capabilities into an intuitive, real-time platform, while also ensuring the backend is reliable, scalable, and secure.

You will:

Work closely with AI, product, and design to architect and build features end-to-end (frontend + backend).
Design and build core application systems: AI agent experiences, data visualization, and a real-time simulation interface for video, audio, chat, and beyond.

Build and maintain backend services and APIs that power simulations, including auth, session management, billing hooks, permissions, and orchestration of AI workflows.
Integrate LLM pipelines and agentic systems into production via robust backend patterns: queues/jobs, rate limiting, retries, caching, and observability.
Own data flows across the stack: schema design, database performance, event tracking, and analytics pipelines that inform product iteration.

Rapidly prototype new AI-driven features—from initial prompt/design to full-stack implementation—and ship in tight loops.
Improve performance and reliability: optimize latency for real-time experiences, harden APIs, and contribute to deployment/infra practices as we scale.

Requirements

2+ years of experience as a full-stack engineer, ideally in a startup or similarly fast-paced environment.

Strong with modern frontend technologies (React/Next.js) and solid backend experience building APIs/services (Node.js/TypeScript, Postgres/Supabase or similar).
Experience with real-time systems (WebSockets/WebRTC) and integrating AI/LLM SDKs (e.g., Vercel AI SDK, LangChain).
Comfortable with backend fundamentals: API design, database modeling, caching, background jobs/queues, security basics, and monitoring.

Strong product mindset and attention to UX—able to sweat the details and ship polished experiences.
Interest in generative AI, LLMs, RAG pipelines, and agentic architectures.

Remote work requirements: Reliable internet connection and ability to work effectively using modern collaboration tools.

Benefits

Compensation:

Compensation varies based on profile and experience, but a general cash range (fixed comp + performance variable) is $100,000-$250,000, plus a very competitive equity package.

Description

Sword is a leading provider of business technology solutions within the Energy, Public and Finance Sectors, driving real transformation change within our clients. We use proven technology, specialist teams and domain expertise to build solid technical foundations across platforms, data and business applications. We have a passion for using technology to solve business problems, working in partnership with our clients to help in achieving their goals.

About the role:

We are supporting an Oil and Gas operator service transition programme and are looking for a Test Lead . This major transformation spans both IT and Operational Technology (OT) environments, aiming to establish secure, autonomous platforms while maintaining critical infrastructure continuity.

We’re looking for a Senior QA & Test Lead to shape and drive the Quality Assurance and Testing function across this complex, high-impact landscape. You’ll play a pivotal role in delivering confidence ahead of go-live, ensuring full traceability between requirements, design, and validation, and embedding best practice test governance from the outset.

As the Senior QA & Test Lead, you will:

Define and lead the Test Strategy, aligning with both functional and non-functional requirements across IT and OT domains

Create and govern a Test Plan that supports traceability, risk mitigation, and readiness for system cutover

Drive adoption of V-Model/W-Model principles to ensure robust alignment across requirements, design, and testing
Collaborate with analysts, architects, engineers, and delivery leads to ensure smooth transition from planning to execution
Lead test analysis, scripting, data preparation and prerequisite coordination

Provide clear reporting on test progress, risks, and quality metrics to senior stakeholders

Requirements

Extensive experience in leading Quality Assurance and Testing within complex programmes, ideally involving IT/OT integration, networked environments, or large-scale infrastructure transformations
A deep understanding of V-Model/W-Model testing methodologies, with a strong focus on requirements, design, and testing traceability throughout the delivery lifecycle

Proven ability to design and implement end-to-end test strategies and plans, particularly in regulated or safety-critical environments
Strong awareness of non-functional testing needs, including performance, security, and operational readiness — especially relevant to networks and Operational Technology (OT) systems
Exceptional communication skills, with confidence engaging across senior stakeholders, technical teams, and delivery partners

Experience in highly regulated sectors such as utilities, energy, or Critical National Infrastructure (CNI) is highly desirable
A proactive, detail-oriented mindset with the ability to balance governance with practical delivery

Benefits

At Sword, our core values and culture are based on caring about our people, investing in training and career development, and building inclusive teams where we are all encouraged to contribute to achieve success.

We offer comprehensive benefits designed to support your professional development and enhance your overall quality of life. In addition to a Competitive Salary, here’s what you can expect as part of our benefits package:

Personalised Career Development: We create a development plan customised to your goals and aspirations, with a range of learning and development opportunities within a culture that encourages growth.
Flexible working: Flexible work arrangements to support your work-life balance. We can’t promise to always be able to meet every request, however, are keen to discuss your individual preferences to make it work where we can.

A Fantastic Benefits Package: This includes generous annual leave allowance, enhanced family friendly benefits, pension scheme, access to private health, well-being, and insurance schemes, an employee assistance programme, discounted cash plan and more….

At Sword we are dedicated to fostering a diverse and inclusive workplace and are proud to be an equal opportunities employer, ensuring that all applicants receive fair and equal consideration for employment, regardless of whether they meet every requirement. If you don’t tick all the boxes but feel you have some of the relevant skills and experience we’re looking for, please do consider applying and highlight your transferable skills and experience. We embrace diversity in all its forms, valuing individuals regardless of age, disability, gender identity or reassignment, marital or civil partner status, pregnancy or maternity status, race, colour, nationality, ethnic or national origin, religion or belief, sex, or sexual orientation. Your perspective and potential are important to us.

If we can do anything to help make the hiring process more accessible, please let our talent acquisition team know when you apply so we can support any adjustments.