Senior Software Engineer - Full-Stack (React/Node) | Hybrid

Online Filings; City Of London; Hybrid; GBP 50,000 - 65,000; Full time

Benefits offered by this job

Competitive Salary

Performance Bonus

Holiday Allowance 27 days

Health Insurance

Hybrid work

Job summary

Online Filings is seeking a Senior Software Engineer to architect and develop our next-generation web application and API. This role requires technical leadership, hands‑on development, and mentoring of junior developers to ensure scalability, security and performance.

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

Qualifications

• Education: Bachelor’s in Computer Science or related field from a Tier 1 university.
• Experience: Minimum of 4 years of full‑time professional experience in software development, with strong expertise in TypeScript, ReactJS, and Next.JS. Solid experience in building RESTful APIs
• 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, writing queries and performance optimisation.
• 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.

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 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 Analytics, Google Ads, HMRC, etc…
• 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.

Skills

TypeScript

ReactJS

Next.js

RESTful APIs

Leadership

Education

Bachelor's in Computer Science

Tools

Node.js

AWS

Terraform

Docker

Kubernetes

Job description

Online Filings is seeking a Senior Software Engineer to architect and develop our next-generation web application and API. This role requires technical leadership, hands‑on development, and mentoring of junior developers to ensure scalability, security and performance.

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