Senior Software Developer

About Unily

Unily partners with the world’s largest and most complex enterprises to power Organizational Velocity through digital Employee Experience transformation. Iconic brands, including Estée Lauder Companies, CVS Health, and British Airways, use Unily’s market-leading Employee Experience platform to improve productivity, streamline communication, and foster a highly connected workplace.

Unily is the only triple leader recognized by all three of the major analysts. Unily is recognized as a Leader in the 2024 Gartner® Magic Quadrant™ for Intranet Packaged Solutions, the 2024 Forrester Wave™: Intranet Platforms, and the IDC MarketScape: Worldwide Experience-Centric Intelligent Digital Workspaces 2024. With these accolades, we continue to grow and expand our employee community with people who are passionate about joining us on this exciting journey.

Job Purpose

As we continue to expand our market share in the rapidly emerging Employee Experience platform category, we are looking for an experienced Senior Full Stack Software Engineer to play a key role in the delivery of a greenfield platform with AI at its core. This is an opportunity to shape a cutting-edge product from the ground up, leveraging modern web technologies and cloud infrastructure, and working at the intersection of software engineering and applied AI. 

As a senior member of the team, you’ll combine deep hands-on development expertise with architectural thinking, mentorship, and collaboration across disciplines. You will work closely with engineers, product designers, and engineering leadership to deliver scalable, performant, and secure applications that solve real-world problems through AI. 

This is a hybrid role, with around 3 days per week expected in our Eashing office. Some on-call availability may be requested during critical periods, with prior arrangement. 

Main Responsibilities

• Own and contribute to the full software development lifecycle of new features and core platform capabilities, from architectural design to hands-on coding and deployment. 
• Design and build APIs, UIs, and services using a modern stack including Next.js, React, Node.js, and PostgreSQL or similar. 
• Collaborate to build intelligent features and decision-making workflows into user-facing products. Design and implement automated tests to validate and protect the quality and stability of the systems you work on. 
• Lead by example, promoting high-quality coding practices, automated testing, peer reviews, and continuous delivery. 
• Participate in team activities such as planning, retrospectives and reviews. 
• Help lead technical discussions that drive better decision-making and outcomes. 
• Mentor junior and mid-level developers, fostering a learning culture and helping others navigate complex technical challenges. 
• Ensure strong observability, performance monitoring, and security are baked into everything we ship. 
• Contribute to the technical vision of the product, evaluating and recommending new tools, libraries, and architectural patterns as needed. 
• Support and evolve CI/CD pipelines, automated test suites, and deployment practices. 
• Help enforce compliance standards such as data privacy, accessibility, security. 
• Comfortable leading architecture discussions, participating in code reviews, and guiding team decisions. 

Requirements

• A passion for building, shipping and supporting high quality software. 
• Strong motivation to work with cutting-edge tools and development practices. 
• Strong proficiency in modern full stack development, particularly with React, TypeScript, Node.js, Next.js, and database technologies such as PostgreSQL. 
• Experience working with cloud infrastructure, preferably with Azure or Vercel. 
• Solid understanding of software engineering principles, web architecture, and performance optimisation. 
• Familiarity with integrating and consuming AI models via APIs. 
• Experience building and consuming RESTful and/or GraphQL APIs. 
• Knowledge of automated testing frameworks (e.g., Cypress, Playwright) and best practices for test-driven development. 
• Experience with search technologies and indexing systems such as Elasticsearch, Typesense or Meilisearch with an understanding of performance, scalability, and relevance tuning.  
• Ability to thrive in a fast-moving environment, balancing short-term needs with long-term scalability. 
• Excellent communication skills, with a proven ability to collaborate cross-functionally and explain technical concepts to non-technical stakeholders. 

Nice to have 

• Proficient in the use of advanced development environments and AI-powered tooling such as Cursor, with an emphasis on increasing velocity, improving code quality, and leveraging contextual AI assistance in day-to-day engineering workflows. 
• Exposure to incorporating LLMs into engineering workflows for production-ready applications, including prompt engineering and context management. 
• Familiarity with multiple LLM providers (e.g. OpenAI, Anthropic, Google) and an understanding of their comparative strengths, trade-offs, and integration models. 
• Experience with AI/ML toolchains such as OpenAI, Hugging Face, LangChain, or custom model serving. 
• Demonstrated ability to work on greenfield projects, defining new patterns, processes, and tooling from the ground up. 
• Experience with GitHub Actions, Terraform, or similar DevOps tooling. 
• Familiarity with vector databases or hybrid search infrastructure (e.g., pgvector,  Pinecone). 
• Experience in data privacy, ethical AI, or governance frameworks. 
• Familiarity with real-time applications using technologies like WebSockets or serverless edge functions. 

We are united by a shared purpose and are committed to truly understanding each other. We know that everyone is unique and has their own story. We strive to have a diverse workforce that embraces and celebrates one another. We are united in building connections and curious to learn from each other so that we continue to grow together to build the workplace of tomorrow.  

Why Work For Unily? 

In addition to a generous base salary and discretionary company bonus, here are some things we think you will love: 

Our awesome team culture. We are focused on achieving results as a team and having fun while we do it. You won’t find a friendlier or more dedicated bunch of people. 

Our industry leading product. We are very proud of our ever-evolving product, naturally we use (and love) it internally and provide the tools and resources for you (and our clients) to become a Unily expert. 

The flexibility that we offer. We don’t just mean working from home occasionally. We operate on a hybrid basis, and also recognize that life happens during the 9-5.30 and encourage a sustainable work/life balance. 

Our bright and modern office spaces. When you need to be in the office we want it to be like being at home. We have a well-stocked kitchen and the option to bring your dog to work. 

We offer a fantastic suite of benefits. Including 25 days holiday plus an extra paid day off to enjoy your birthday, Vitality life cover (for health, sight, hearing and dental), Aviva pension (via a salary sacrifice scheme), life assurance, income protection and so many more. 

Our commitment to sustainability and giving back to the community. We know working for an organisation that takes its environmental & social impact seriously is important, and we are proud to offer 1 fully paid volunteering day per year, an employee matching charity donation scheme and options to lease an Electric Vehicle through our salary sacrifice scheme. 

View Unily's UK & EEA Careers Privacy Notice here

View Unily's USA Careers Privacy Notice here