Polyglot Engineer (JS/Python/Go)

YLD; Greater London; Remote; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Private health care

Maternity/paternity leave

Annual leave 25 days

Training allowance

Hardware allowance

Mental health support

Headspace or Calm subscription

Bonus

Company laptop

Job summary

YLD is a remote-first consultancy specialising in software engineering, product design, and data, with teams across London, Lisbon, and Porto. We seek a Senior Software Engineer to build scalable, fault-tolerant architectures and deliver outstanding products in a fast-paced environment.

You will collaborate with cross-functional teams to design, implement, and monitor highly available systems, mentor peers, and drive improvements across the engineering function.

Qualifications

• Experience with modern frameworks across the stack including FastAPI, Gin and Express.
• Production experience with React, modern build tools, state management and accessibility.
• Comprehensive testing—unit, integration, E2E, security—and performance optimization.
• Scalable system design patterns, load balancing and high-availability architectures.
• Database design and optimization for relational and NoSQL databases.
• API development REST/GraphQL/gRPC and event-driven architectures.
• Caching strategies and message queues (Redis, Kafka, RabbitMQ).
• Cloud platforms (AWS/Azure/GCP) with Docker/Kubernetes; CI/CD and IaC (Terraform, CloudFormation).
• Monitoring and observability; debugging production issues calmly.

Responsibilities

• Crafting excellent products by building new features to meet client needs.
• Delivering changes continually as teams move to CI/CD.
• Collaborating closely with the team on engineering initiatives.
• Mentoring the engineering team to accelerate career growth.
• Architecting, designing, and delivering highly available, zero-downtime products.
• Overseeing production operations and monitoring per SLAs.
• Promoting best practices and driving impact across the department.
• Show and tell sessions to share work with the department and wider company.

Skills

FastAPI

Gin

Express

React

CI/CD

Testing

Performance testing

Load balancing

High availability

Relational databases

NoSQL

REST

GraphQL

gRPC

Redis

Kafka

RabbitMQ

AWS

Kubernetes

Docker

Terraform

CloudFormation

Tools

Docker

Kubernetes

Terraform

CloudFormation

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.

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

• 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

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.