National AI Awards 2025Discover AI's trailblazers! Join us to celebrate innovation and nominate industry leaders.

Nominate & Attend

Senior Full Stack Engineer/ Developer

Online Filings
London
5 months ago
Applications closed

Related Jobs

View all jobs

Machine Learning Full Stack Engineer Contractor (Python / Flutter / GCP) | Fully Remote / EU-Ba[...]

Senior Machine Learning Engineer

Machine Learning Engineer

Computer Vision Engineer

Computer Vision Engineer

Computer Vision Engineer...

About Online Filings


Check below to see if you have what is needed for this opportunity, and if so, make an application asap.

Our mission is to empower entrepreneurs to realise their dreams, giving them more time to focus on what truly matters.

Our platform simplifies all administrative tasks, allowing entrepreneurs and small business owners to manage their business admin effortlessly and without the usual complexities.

By harnessing cutting-edge technology and data analytics, coupled with outstanding customer service, we provide a seamless experience that emphasises simplicity, efficiency, and rapid execution. Our goal is to remove obstacles, enabling you to achieve success faster and more effectively.

Role Overview

As a Senior Software Developer, you will play a pivotal role in architecting and developing our next-generation web application and API using the SERN stack. This role requires technical leadership, hands-on development, and mentoring of junior developers. You will drive the adoption of best practices, ensuring scalability, security, and performance.

If you are passionate about software development, enjoy solving complex problems, and are ready to lead innovative projects, we encourage you to apply. Join our dynamic team and contribute to building transformative solutions that make a tangible impact.

This role will be eligible for visa sponsorship only for candidates that are already based in the UK.

Key Responsibilities

  • Technical Leadership:Lead the technical design and development of scalable, secure web applications and APIs, driving best practices across the development lifecycle.
  • Architecture & Design:Oversee system architecture decisions, ensuring alignment with business goals and scalability requirements.
  • Mentorship:Mentor and guide junior and mid-level developers, fostering a collaborative learning environment.
  • API Development:Design and build RESTful API endpoints using NodeJS and Express, including detailed API documentation.
  • Database Management:Design, optimize, and maintain complex SQL data models, ensuring efficient data structures, query performance, and reliability.
  • Full-Stack Development:Develop responsive and performant front-end applications using ReactJS, focusing on UX/UI best practices.
  • Integration & Automation:Architect and maintain integrations with external APIs such as AWS, Stripe, Zendesk, Twilio, Google Cloud, and HMRC.
  • Legacy System Management:Oversee the migration of legacy system (built with OOPHP 8, Bootstrap, jQuery, Mongo) to the new SERN-based order management system.
  • Code Quality & Reviews:Enforce code quality through rigorous reviews, automated testing, and CI/CD processes.
  • Project Management:Collaborate with cross-functional teams to gather requirements, set timelines, and deliver high-quality solutions on schedule.
  • Continuous Improvement:Stay ahead of industry trends, introducing innovative tools and technologies to enhance development efficiency.

Qualifications and Key Skills

  • Education:Bachelor’s or Master’s degree in Computer Science or related field from a Tier 1 university.
  • Experience:Minimum of 6 years of full-time professional experience in software development, with expertise in JavaScript, ReactJS, and NodeJS.
  • Leadership:Proven track record of leading development teams and managing large-scale projects.
  • Database Expertise:In-depth experience with PostgreSQL/SQL, including design of complex schemas and performance optimization.
  • Technical Skills:Strong proficiency in HTML/CSS, modern JavaScript frameworks (ReactJS, Next.js), and responsive design.
  • Security & Performance:Deep understanding of application security best practices, performance tuning, and scalable architecture.
  • Problem-Solving:Ability to troubleshoot complex technical issues, with a proactive and solution-oriented mindset.
  • Soft Skills:Excellent communication, organisational skills, and the ability to work independently or within a team.

Preferred Qualifications

  • Advanced Degrees:Master’s in Data Science or Software Engineering.
  • Cloud & DevOps:Experience with AWS cloud services, Terraform, Docker, Kubernetes
  • Agile/DevOps:Experience with Agile methodologies, CI/CD pipelines, and project management tools (Jira, Confluence, Bitbucket).
  • AI/ML:Exposure to AI/ML projects or data analytics.
  • API Development:Experience working with Stripe (payment intents, subscriptions, webhooks, sales extractions), Open Banking, Chat GPT, Twilio, Zendesk, and SendGrid, etc...

Benefits and Perks

Our comprehensive offering is designed around flexibility, well-being, and continuous growth, ensuring that you have the support and resources to excel both professionally and personally.

  • Competitive Salary:£58,000 - £65,000 per year, with potential performance-based increases.
  • Performance Rewards: up to 10% annual bonus.
  • Generous Holiday Allowance: 27 days holiday plus bank holidays.
  • Health insurance: private health insurance including regular health screenings and consultations, dental care, and vision tests.
  • Lifestyle Benefits: benefit from up to 50% discounts at selected gyms and exclusive lifestyle accessory offers and rewards to support your physical health and well-being.
  • Mental Health Support: access to up to 8 free Cognitive Behavioural Therapy (CBT) sessions and annual subscriptions to mindfulness apps like Headspace.
  • Retirement: We contribute 3% to your pension, for every 5% you contribute.
  • Training: 10% of your time is dedicated towards learning.
  • Powerful computerto work from your home.
  • Cycle to work scheme.
  • Flexible Working Options: hybrid setting (3 days in the office from the creative studio, in the heart of London), with flexible hours.

Online Filings is an equal opportunity employer. We celebrate diversity and are committed to equal employment and creating an inclusive environment for all employees, irrespective of race, gender, sex, religion, nationality, age or disability.

National AI Awards 2025

Subscribe to Future Tech Insights for the latest jobs & insights, direct to your inbox.

By subscribing, you agree to our privacy policy and terms of service.

Industry Insights

Discover insightful articles, industry insights, expert tips, and curated resources.

AI Jobs UK 2025: 50 Companies Hiring Now

Bookmark this guide – we refresh it every quarter so you always know who’s really scaling their artificial‑intelligence teams. Artificial intelligence hiring has roared back in 2025. The UK’s boosted National AI Strategy funding, record‑breaking private investment (£18.1 billion so far) & a fresh wave of generative‑AI product launches mean employers are jockeying for data scientists, ML engineers, MLOps specialists, AI product managers, prompt engineers & applied researchers. Below are 50 organisations that have advertised UK‑based AI vacancies in the past eight weeks or formally announced growth plans. They’re grouped into five easy‑scan categories so you can jump straight to the kind of employer – & culture – that suits you. For each company you’ll find: Main UK hub Example live or recent vacancy Why it’s worth a look (tech stack, culture, mission) Use the internal links to browse current vacancies on ArtificialIntelligenceJobs.co.uk – or set up a free job alert so fresh roles land in your inbox.

Return-to-Work Pathways: Relaunch Your AI Career with Returnships, Flexible & Hybrid Roles

Stepping back into the workplace after a career break can feel like embarking on a whole new journey—especially in a cutting-edge field such as artificial intelligence (AI). For parents and carers, the challenge isn’t just refreshing your technical know-how but also securing a role that respects your family commitments. Fortunately, the UK’s tech sector now boasts a wealth of return-to-work programmes—from formal returnships to flexible and hybrid opportunities. These pathways are designed to bridge the gap, equipping you with refreshed skills, confidence and a supportive network. In this comprehensive guide, you’ll discover how to: Understand the booming demand for AI talent in the UK Leverage transferable skills honed during your break Overcome common re-entry challenges Build your AI skillset with targeted training Tap into returnship and re-entry programmes Find flexible, hybrid and full-time AI roles that suit your lifestyle Balance professional growth with caring responsibilities Master applications, interviews and networking Whether you’re returning after maternity leave, eldercare duties or another life chapter, this article will equip you with practical steps, resources and insider tips.

LinkedIn Profile Checklist for AI Jobs: 10 Tweaks That Triple Recruiter Views

In today’s fiercely competitive AI job market, simply having a LinkedIn profile isn’t enough. Recruiters and hiring managers routinely scout for top talent in machine learning, data science, natural language processing, computer vision and beyond—sometimes before roles are even posted. With hundreds of applicants vying for each role, you need a profile that’s optimised for search, speaks directly to AI-specific skills, and showcases measurable impact. By following this step-by-step LinkedIn for AI jobs checklist, you’ll make ten strategic tweaks that can triple recruiter views and position you as a leading AI professional. Whether you’re a fresh graduate aiming for your first AI position or a seasoned expert targeting a senior role, these actionable changes will ensure your profile stands out in feeds, search results and recruiter queues. Let’s dive in.