Polyglot Engineer (JS/Python/Go)

YLD; Greater London; On-site; GBP 80,000 - 120,000; Full time

Benefits offered by this job

Private Health Care

Maternity/Paternity Leave

Annual holiday 25 days

Training/Conferences allowance

Hardware allowance

Mental Health support

Headspace/Calm access

Bonus potential

Company laptop

Referral schemes

Job summary

YLD in the United Kingdom is seeking a Senior Software Engineer to join a remote-first consultancy focused on software engineering, product design, and data. You will help build innovative products for clients, designing scalable, fault-tolerant architectures and delivering features in a fast-paced environment.

As part of a collaborative engineering team, you will mentor colleagues, contribute to production operations, and advance best practices to ensure high availability and quality across

Qualifications

• Experience with modern frameworks across the stack (FastAPI, Gin, Express, etc.).
• Production experience with React, modern build tools, state management, responsive design, and accessibility standards.
• Comprehensive testing experience (unit, integration, E2E, security) and performance optimization.
• Scalable system design patterns, load balancing, and high-availability architectures.
• Database design and optimization (relational and NoSQL).
• API development (REST, GraphQL, gRPC) and event-driven architectures.
• Caching strategies and message queue systems (Redis, Kafka, RabbitMQ).
• Cloud platforms (AWS, Azure, GCP) with containerisation (Docker, Kubernetes).
• CI/CD pipelines and Infrastructure as Code (Terraform, CloudFormation).
• Monitoring, observability, and performance optimisation tools.

Responsibilities

• Crafting excellent products by building new features meeting client needs.
• Delivering changes to products as clients move to CI/CD model.
• Collaborating with team on engineering initiatives to improve performance.
• Mentoring the engineering team to accelerate career growth.
• Architecting, designing, building, and delivering highly available, zero-downtime products.
• Owning production operation and monitoring of products per SLAs.
• Promoting best practices within the team and department.
• Showcasing work through regular demonstrations to the department and wider company.

Skills

JavaScript/TypeScript

Python

Go

Modern frameworks

React

Testing

Performance optimization

System design

Relational DB

NoSQL

REST/GraphQL

Caching

Messaging systems

Cloud platforms

Docker/Kubernetes

CI/CD

Terraform/CloudFormation

Monitoring/Observability

Debugging production issues

AI tools in engineering

Tools

FastAPI

Gin

Express

React

CI/CD tools

Terraform

CloudFormation

Docker

Kubernetes

Redis

Kafka

RabbitMQ

Job description

Our goal is to help our clients keep moving forward. We work with them to build the skills and capabilities they need to stay ahead of the competition, and we know our success only happens when they succeed. We’re a team of curious, talented people, and we’re committed to making YLD a place where great people want to work, grow, and stay. We’re a remote-first consultancy specialising in software engineering, product design, and data. Our teams are based across London, Lisbon, and Porto, and we create digital solutions that continue to deliver value long after our work is done.

Location: UK

Department: Engineering

Employment Type: Permanent

About YLD:

Our goal is to help our clients keep moving forward. We work with them to build the skills and capabilities they need to stay ahead of the competition, and we know our success only happens when they succeed. We’re a team of curious, talented people, and we’re committed to making YLD a place where great people want to work, grow, and stay. We’re a remote-first consultancy specialising in software engineering, product design, and data. Our teams are based across London, Lisbon, and Porto, and we create digital solutions that continue to deliver value long after our work is done.

About the role:

As a Senior Software Engineer at YLD, you’ll be part of a client team building innovative products. We’re looking for someone curious, passionate, driven, and enthusiastic. You should be skilled in problem-solving and experienced in designing scalable, resilient, and fault-tolerant architectures. You’re also an effective communicator and a strong team player. Together with your team, you’ll thrive in a fast-paced engineering environment, delivering outstanding results and exciting projects.

Your day-to-day responsibilities will look like this:

• Crafting excellent products! You will be building new features that meet the needs of our clients and customers;
• Continuously delivering changes to products, as our client is moving to a full CI/CD model;
• Working closely with your team, regularly collaborating and on engineering initiatives, to continually push yourselves to be better;
• Learning, growing, and mentoring the engineering team to accelerate their career growth and encourage them to progress;
• Working with the Lead to architect, design, build, and deliver highly available, always-on, zero downtime products;
• Being responsible for the production operation and monitoring of products in line with SLAs;
• Driving good practices within your team, making an impact on the whole department;
• Participating in regular show and tells, promoting your work to both your department and the wider company.

Preferred Skills

• Proficiency in JavaScript/TypeScript, Python, and/or Go, with the ability to rapidly learn new languages;
• Experience with modern frameworks across the stack (FastAPI, Gin, Express, etc.);
• Production experience with React, modern build tools, state management, responsive design, and accessibility standards;
• Comprehensive testing experience (unit, integration, E2E, security) and performance optimization;
• Scalable system design patterns, load balancing, and high-availability architectures;
• Database design and optimization (both relational and NoSQL);
• API development (REST, GraphQL, gRPC) and event-driven architectures;
• Caching strategies and message queue systems (Redis, Kafka, RabbitMQ);
• Cloud platforms (AWS, Azure, GCP) with containerisation (Docker, Kubernetes);
• CI/CD pipelines and Infrastructure as Code (Terraform, CloudFormation);
• Monitoring, observability, and performance optimisation tools;
• You can keep a cool head when debugging production issues;
• Use AI tools to augment your work, applying sound judgement to adopt emerging technologies where they genuinely add value and increase your impact as an engineer.

You should apply if you are:

• Self-motivated, proactive and always looking for ways to improve and develop yourself;
• A good communicator, both in writing and verbally. You’ll be able to explain technical ideas and concepts in business-friendly language.
• Detail-oriented;
• Possess strong problem-solving skills that balance innovation with pragmatic technology choices to solve business needs;
• Used to working in a team-oriented, collaborative environment;
• Analytical and problem-solving-oriented;
• A genuine believer in diversity and fairness.

Benefits you’ll receive:

• Company Private Health care (currently provided by Vitality)
• Enhanced fully paid maternity and paternity leave for up to 6 months
• 25 days annual holiday (excluding Public Holidays)
• £2000 annual allowance for Training/Conferences
• £300 annual allowance for additional hardware
• Mental Health support: access to Oli app
• Meditation/Sleep support: Headspace or Calm app subscription
• Bonus (depending on Company performance and results)
• Company laptop
• Generous referral schemes

Our typical Recruitment Process looks like this:

• 1st Interview with someone from the Talent team (30/45 mins)
• Technical Interview with our Senior Developers (1h30)

Get a glimpse of what it's like working at YLD!

Check out our LinkedIn page

We live and breathe our values, and know you will too:

• Growing every day
• Including everyone
• Relationships built on honesty and ethics
• Inspiring solutions
• Winning together

We’re an equal-opportunity employer and value diversity in all its forms. We do not discriminate based on race, religion, colour, national origin, gender, sexual orientation, pregnancy or maternity, age, marital status, or disability. We also offer a remote-first working environment, with flexible working and work–life balance as standard for all employees.