Senior Software Engineer - Backend

Meet Avanita

Avantia Law is redefining legal services through AI-powered innovation. Since our launch in 2019, we’ve experienced exceptional growth, helping top-tier investment funds and asset managers handle routine legal and compliance work faster and more cost-efficiently.

We are powered by AI but committed to our people.

We offer a culture of trust and flexibility to employees. We have an office in London for those wishing to spend some portion of their working time with colleagues, but employees are also welcome to work predominantly remotely. We have a truly diverse workforce, with members of staff coming from all corners of the world. There are around 100 of us at Avantia, so we’re small and friendly enough for you to get to know everyone and make an impact – but big enough to offer you great career prospects.
 

What you will be doing

• Develop and maintain backend services for internal-facing web applications.
• Build APIs that power AI-driven document processing and workflow automation for the firm’s legal tools (KYC Compliance & Contracts)
• Translate user feedback and requirements into functional production solutions
• Work with AWS services (Lambda, OpenSearch, S3) to manage and optimize our infrastructure.
• Monitor and troubleshoot production systems, ensuring reliability and performance.

Who we are looking for 

We’re looking for a Senior Software Engineer to help us build and optimise AI-powered tools that integrate with internal web applications, MS Word, and MS Outlook. You’ll work closely with senior engineers, our CTO, and stakeholders to design, build, and maintain high-quality, production-ready solutions.

This role is ideal for someone with strong experience in Python development and a good understanding of AWS. If you’re excited about working on the backend of AI-driven applications and want to gain hands-on experience with cloud infrastructure, this is a great opportunity for you! 

Requirements

• Experienced with backend development (APIs, databases, web frameworks like Flask or FastAPI).
• Proficiency with Python
• Familiarity with (or interest in) AWS services (S3, Lambda, OpenSearch).
• Eagerness to learn about DevOps practices (CI/CD, infrastructure as code, cloud security).
• A problem-solving mindset and willingness to take on new challenges.
• Start-up experience would be advantageous but not essential - you should thrive in small teams and be willing to roll your sleeves up.

Benefits

• 25 days holiday + UK Bank Holidays
• An additional day off for your birthday
• Private healthcare or the option to use the budget to be reimbursed for other wellness activities of your choice
• Annual subscription to your choice of Calm or Headspace
• Early finish Fridays in the summer
• Pension scheme (enhanced after 1 year service)
• Enhanced family friendly policies after 1 year
• Option to work from abroad for a max of 1 month per year

AVANTIA LAW - CORE VALUES

We empower our people 

We trust our people to excel by giving them a voice, the freedom to grow, and the support they need to succeed. Together, we hold ourselves accountable and create meaningful impact—for our clients, our team, and our industry. 

We champion excellence 

Our values are at the heart of every decision we make. We stand by our commitments, consistently delivering exceptional results and building trust through every action. Excellence isn’t just a goal—it’s how we operate. 

We are building the future 

We’re redefining the legal landscape. Through innovation, challenging conventions and listening to our clients, we’re forging a new path and shaping the next generation of law.