Senior Software Engineer

Legend; London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A leading technology firm in London is seeking a Senior Software Engineer to shape the technical foundation of a high-growth product in the competitive gaming space. You will design and implement backend architecture, focusing on scalability and security. Candidates should be proficient in JavaScript or another backend language, with experience in large-scale systems. The role offers engaging development opportunities, a supportive work-life balance, and is open to diverse applicants.

Benefits

Annual discretionary bonus

Paid annual leave

Long-term incentive plan

Engaging development opportunities

Qualifications

• Proven experience delivering large-scale systems in production.
• Strong grounding in Domain-Driven Design and software design patterns.
• Proficiency in JavaScript (React/Next) or Ruby.

Responsibilities

• Design and implement scalable application architecture.
• Write clean, efficient, and well-documented code.
• Conduct code reviews and contribute to engineering best practices.

Skills

Delivering large-scale systems in production

Domain-Driven Design

API-first architecture

JavaScript (React/Next) or another backend language

Performance optimization

Job description

About Legend

We’re Legend. The team quietly building #1 products that make noise in the most competitive comparison markets in the world. iGaming. Sports Betting. Personal Finance.

We exist to build better experiences. From amplified career paths to supercharged online journeys for our people and our users, we deliver magic rooted in method. With over 500 Legends and counting, we’re helping companies turbocharge their brand growth in over 18 countries worldwide.

If you’re looking for a company with momentum and the opportunity to progress at pace, Legend has it.

Unlock the Legend in you.

The Role

Legend is hiring a Senior Software Engineer reporting directly to our Senior Engineering Manager.

This is an opportunity to shape the technical foundation of a high-growth product in the competitive gaming space — a market scaling rapidly worldwide. You’ll help design and implement the backend and platform architecture that powers real-time tournaments, delivering scalable, secure, and high-performing systems players rely on.

You’ll collaborate closely with engineers, product managers, and designers to deliver high-quality solutions while applying modern practices like Domain-Driven Design, SOLID, and GRASP. If you thrive in fast-paced environments, enjoy tackling tough scaling challenges, and want to shape the future of competitive gaming, this is your chance to make your mark.

In this role, we value diverse perspectives and encourage you to apply even if you don’t meet every qualification listed.

Your Impact

• Design and implement application architecture that is scalable, maintainable, observable, and high-performing.
• Write clean, efficient, and well-documented Ruby/JavaScript (or other backend language) code.
• Conduct code reviews, review architecture, and contribute to engineering best practices.
• Identify and optimise performance bottlenecks across systems.
• Collaborate closely with cross-functional teams to deliver impactful features.
• Ensure application security, implementing safeguards against vulnerabilities.

What You\'ll Bring

• Proven experience delivering large-scale systems in production.
• Strong grounding in Domain-Driven Design, API-first architecture, and software design patterns.
• Proficiency in JavaScript (React/Next) or another backend language, with knowledge of Ruby as a plus.
• Experience with Pub/Sub, websockets, and Server-Sent Events (SSE).
• A strong product engineering mindset — able to translate requirements into technical designs and ship features end-to-end.

The Interview Process

• Initial Chat with Talent Partner (45 mins via Zoom)
• Interview with our Technical team (1 hour video via Zoom)
• Technical Interview with coding exercise with our Technical team (1.5 hour video via Zoom or 2x 1hr interview via Zoom depending on your preference)
• Interview with our Non-Technical team (1 hour video via Zoom)
• Final Interview with our Technical Leadership Team (1 hour video via Zoom)

Why Legend

• Super smart colleagues to work alongside and learn from.
• Engaging development opportunities at all levels.
• Tailored flexibility for your work-life balance.
• Annual discretionary bonus to reward your efforts.
• Paid annual leave PLUS a well-deserved break to recharge during the festive season! Our offices close between Christmas and New Year’s — no need to dip into your allowance.
• Long-term incentive plan so we can all share in the growth and success of Legend.
• Exciting global Legend events, where we unite in person to ignite our shared passion and unveil the exciting strategies for the year ahead!
• Unlock your full potential by joining the Legend team. To support you on this journey, we provide an extensive array of benefits and perks, as outlined in our global offerings above. For country-specific benefits please reach out to your Talent Partner.

Legend is an Equal Opportunity Employer. We’re dedicated to hiring diverse talent — which includes individuals with different backgrounds, abilities, identities and experiences. If you require any reasonable adjustments throughout your application process, please speak to your Talent Partner or contact the team on [e-mail], and we\'ll do all we can to support you.