Senior Software Engineer

Position: Senior Software Engineer  

Reports to: Engineering Manager

Location: London      

Salary: £85,000 - £100,000 

About MillTech

MillTech provides advanced FX and cash management solutions to increase market access, reduce costs and automate manual workflows.

With a focus on automation, integration and connectivity, we have pioneered an independent risk management and liquidity solution for fund managers, institutions and global corporates, which is purpose-built to deliver best execution at scale.

Our end-to-end operational workflow enables automation, standardisation and cost transparency on all FX transactions and cash movements.

A highly secure platform centralises all client FX and cash activities to enhance oversight whilst increasing control, all at no additional costs. It offers quick onboarding routes, multi-bank best execution and hedging management services.

Headquartered in London, the world’s largest FX hub, MillTech provides services to clients in the United Kingdom, United States, Canada, Switzerland, Belgium, Denmark, Ireland, Luxembourg, Norway and Liechtenstein. MillTech is authorised and regulated by the UK’s Financial Conduct Authority (FCA FRN 911636) and registered with the USA’s National Futures Association (NFA). 

Your mission

We’re looking for an exceptional Software Engineer, preferably with a background in finance (ideally FX) to join our growing team. This is a unique opportunity to bring your skills and ideas to a fast-growing fintech company, where you will support us in defining and delivering technology solutions that help to deliver our ambitious plans.

We're a team that is embracing AI across the entire software development lifecycle, and so we're looking for someone who is comfortable working this way and wants to push it further.

This role will focus on enhancing and modernising the trading capabilities of the group through developing the core trading backbone, and its respective middle and back office processes. This will include a mix of new features, reduction of technical debt and greater integration into the MillTech technology estate.

Your responsibilities in this role will include:

• Development across the full stack, with the ownership and breadth that comes with a smaller team


• Contribute to architecture decisions


• Support & maintenance of code


• Discovery and integration of new technologies


• Help to embed a culture of engineering excellence and continuous improvement

Required skills:

• 5+ years experience working in C#/.NET


• Strong SQL experience


• Experience developing cloud native solutions in AWS and/or Azure


• Experience with event-driven, message-based, micro-service architectures


• Experience across the SDLC across software design, delivery and support


• Hands on experience using AI tools in your development workflow

Who You Are

These matter just as much as your technical skills:

• A strong communicator - you explain ideas clearly and you listen well. In a small team, how you communicate is as important as what you deliver


• Collaborative by nature - you enjoy working closely with others, sharing knowledge, and helping teammates grow.


• Adaptable and flexible - you thrive in an environment where priorities can shift, and you're happy to pick up something outside your usual scope


• Comfortable with ambiguity - You find that energising, not stressful


• Self-starting and resourceful - you don't wait for detailed specifications. You ask smart questions, figure things out, and move forward


• Comfortable with using AI tools in your development workflow

Nice to have:

• Experience working in a small team or startup environment


• Background in FX or financial markets

What we offer in return:

Our commitment is to help you flourish in this role, through support with your professional development, opportunities to be involved in key projects, and exposure to challenges that you may not be offered in a larger organisation.  We will provide:

• A competitive salary with annual reviews;


• 25 days’ paid annual leave plus an additional day per year of service;


• Excellent staff development and training opportunities;


• Flexible working arrangements including remote working;


• Medical insurance;


• Dental insurance;


• EV Scheme and Cycle to work scheme;


• Enhanced maternity and paternity leave;


• 1 day off for charity work per quarter and many other benefits!

How to apply?

At MillTech we believe that diversity and inclusion are essential for fostering innovation and building a strong, supportive work environment. We are committed to embedding the best equality and diversity practices into all our activities, making us an inclusive, welcoming, and exciting place to work. We would welcome candidates from all backgrounds and experiences.

We would love to hear from you if you think that you’re a good fit for this role.  To apply you should upload your CV.  One of the team will then be in touch with you to discuss the next steps.