Tact
Senior Software Engineer
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Senior Software Engineer // London hybrid // Fintech // £120,000 🚀
Want to build greenfield AI products without giving up hands-on engineering?
You'll be joining a growing London fintech building data and analytics technology for hedge funds, asset managers and professional credit investors.
They've built their reputation around high-quality financial data and are now pushing further into AI, LLMs and agent-based products. With an engineering team of around 14 people, you'll have the chance to work on greenfield technology, influence how new products are built and have a genuine impact without getting lost in a huge engineering organisation.
The role
This is a senior, hands-on engineering position where you'll take new projects from idea through to production.
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You'll be working across Node.js, Python and AWS, taking ownership of:
- Designing architecture and making key technical decisions
- Building greenfield AI and LLM-powered features
- Writing production code across Node.js and Python
- Working with AWS and Infrastructure as Code
- Designing and developing databases, particularly PostgreSQL
- Technically leading other engineers through delivery
This isn't a people-management role. You'll stay close to the code while having significant technical and architectural ownership.
What they're looking for:
- Strong Node.js experience
- Good hands-on Python experience
- Strong AWS knowledge
- Architecture and technical leadership experience
- Previous experience within finance or financial services
- Practical experience building AI/LLM features into products
- Database experience, ideally PostgreSQL
- DynamoDB and Elasticsearch are a bonus
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What's on offer
- £120,000 base salary
- 2 days per week in central London
- Greenfield AI and agent-based projects
- 25 days holiday + bank holidays
- Health insurance and pension
- Choice of high-quality tech kit
- Learning and development
If you want to stay hands-on, solve complex engineering problems and help shape new AI-powered products, this is an opportunity to do it in a growing fintech where your work will have real impact.
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