At a Glance
- Tasks: Lead innovative product development and build robust software solutions.
- Company: TellJO is a mission-driven startup focused on supporting vulnerable individuals.
- Benefits: Enjoy purpose-driven work, continuous learning, and a collaborative team environment.
- Other info: Work from the Lancing office 5 days a week.
- Why this job: Make a tangible impact while working with cutting-edge technology in a supportive culture.
- Qualifications: Extensive experience in full-stack development, particularly with React and modern C#.
The predicted salary is between 43200 - 72000 £ per year.
Salary: £45,000 - 55,000 per year
Requirements
- Strong commercial experience with C# and modern .NET
- Strong React and TypeScript experience
- Experience with Entity Framework Core and SQL Server
- Experience building and maintaining REST APIs
- Experience designing scalable and maintainable software solutions
- Strong debugging, troubleshooting, and problem-solving skills
- Strong understanding of OWASP Top 10 and secure software development practices
- Experience with Cloudflare WAF and web application security
- Experience with Microsoft Defender for Cloud
- Experience identifying, prioritising, and remediating security vulnerabilities
- Strong understanding of authentication, authorisation, MFA, and least-privilege access principles
- Experience managing Azure-hosted applications and services
- Experience with Azure App Services, Azure SQL, Key Vault, Blob Storage, and monitoring tools
- Experience with Azure DevOps and CI/CD pipelines
- Understanding of cloud security, resilience, and operational best practices
- Comfortable operating independently and taking ownership
- Able to balance strategic thinking with hands‑on delivery
- Strong communication skills and a pragmatic approach to problem solving
- Desirable: ASP.NET Core MVC
- Desirable: Microsoft Entra ID / Azure AD
- Desirable: ISO 27001 or Cyber Essentials
- Desirable: WordPress
- Desirable: SaaS platform experience
- Desirable: Experience working within regulated or security‑conscious environments
Responsibilities
- Design, develop, and maintain applications using C#, .NET, React, and TypeScript
- Own and improve our Azure-hosted SaaS platform
- Manage deployment pipelines and release processes using Azure DevOps
- Ensure the platform remains secure, reliable, scalable, and performant
- Manage Cloudflare WAF, Microsoft Defender for Cloud, and security monitoring
- Apply secure‑by‑design principles throughout the software development lifecycle
- Support ISO 27001 and Cyber Essentials compliance activities
- Troubleshoot issues across application, infrastructure, and security layers
- Contribute to product direction, technical architecture, and continuous improvement
- Use modern AI‑assisted development tools to improve productivity and code quality
Technologies
- AI
- ASP.NET
- Azure
- C#
- CI/CD
- Cloud
- DevOps
- Support
- MVC
- OWASP
- REST
- React
- SQL
- Security
- TypeScript
- WAF
- Web
- WordPress
We are a mission‑driven company. This is a full‑time, office‑based Senior Software Developer role in Worthing at Brooklands House, Lancing, working 37 hours per week Monday to Friday. We offer 28 days holiday including bank holidays (pro rata).
Senior Software Developer in Lancing employer: TellJO
At TellJO, we pride ourselves on being a purpose-driven employer that values innovation and social impact. As a Senior Software Developer in our Lancing office, you'll not only have the opportunity to work with cutting-edge technology but also contribute to meaningful projects that support vulnerable individuals. Our collaborative work culture fosters continuous learning and growth, ensuring that you can develop your skills while making a tangible difference in people's lives.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Software Developer in Lancing
✨Tip Number 1
Familiarise yourself with the technologies mentioned in the job description, especially C#, .NET, and React. Being able to discuss your experience with these technologies in detail during an interview will show that you're not only qualified but also genuinely interested in the role.
✨Tip Number 2
Prepare to showcase your problem-solving skills by thinking of specific examples where you've tackled complex challenges in previous projects. This will demonstrate your analytical mindset and ability to drive technical excellence, which is crucial for a Senior Software Developer.
✨Tip Number 3
Highlight your mentorship experience when discussing your background. Since the role involves guiding less-experienced engineers, sharing stories about how you've helped others grow will resonate well with the hiring team.
✨Tip Number 4
Research TellJO's mission and values thoroughly. Understanding their purpose-driven approach will allow you to align your answers with their goals during the interview, showing that you're not just looking for any job, but are genuinely passionate about making a difference.
We think you need these skills to ace Senior Software Developer in Lancing
Some tips for your application 🫡
Tailor Your CV:Make sure your CV highlights your experience with full-stack applications, particularly in C#, .NET, and React. Emphasise any leadership roles or mentorship experiences you've had, as these are key for the Senior Software Developer position.
Craft a Compelling Cover Letter:In your cover letter, express your passion for coding and how you can contribute to TellJO's mission. Mention specific projects where you've driven technical excellence or mentored team members, showcasing your collaborative attitude.
Showcase Relevant Projects:Include links to your GitHub or portfolio that demonstrate your skills in building complex systems, using CI/CD pipelines, and implementing security best practices. Highlight any experience with modern LLMs or cloud deployments, as these are relevant to the role.
Prepare for Technical Questions:Anticipate technical questions related to your experience with unit testing, performance tuning, and database efficiency. Be ready to discuss your approach to problem-solving and how you've tackled complex challenges in previous roles.
How to prepare for a job interview at TellJO
✨Showcase Your Technical Skills
Be prepared to discuss your experience with C#, .NET, and React in detail. Bring examples of projects you've worked on that demonstrate your ability to architect and build complex systems. This is your chance to shine, so don't hold back!
✨Emphasise Problem-Solving Abilities
Expect questions that assess your analytical and problem-solving skills. Prepare to discuss specific challenges you've faced in previous roles and how you tackled them. Use the STAR method (Situation, Task, Action, Result) to structure your responses.
✨Demonstrate Leadership and Mentorship
As a Senior Software Developer, you'll be expected to lead and mentor others. Share examples of how you've guided less-experienced engineers or contributed to team development. Highlight your collaborative attitude and how you thrive in cross-functional teams.
✨Align with Their Mission
TellJO is a purpose-driven company, so it's important to express your passion for making a difference. Research their mission and be ready to discuss how your values align with theirs. Show that you're not just looking for a job, but a meaningful opportunity.
