Full Stack Engineer

Build Technology That Changes How Businesses OperateAvallo partners with private equity firms and their portfolio companies to solve complex operational and commercial problems through technology.We build new digital products, modernise critical platforms, automate business processes with AI and create the technical foundations companies need to scale.This is not traditional consulting. We do not produce recommendations and leave clients to execute them. Our teams work directly with business leaders, operators and engineers to define the problem, build the solution and deliver measurable results.Our work spans:Product strategy and developmentSoftware engineeringCloud architectureAI and automationData and analyticsTechnology-enabled operational improvementThe RoleWe are hiring a Senior Full Stack Engineer to join our core engineering team.You will take ownership of technically demanding projects across a small number of client engagements, working alongside experienced technology leaders, product specialists and client engineering teams.The role is hands-on. You will design systems, write production code, make architectural decisions and ship software used in real operating environments.You will:Build and launch new applications from the ground upModernise complex and business-critical legacy platformsDevelop AI-enabled products, workflows and automationDesign secure, scalable cloud infrastructureIntegrate with existing systems, APIs and data platformsWork directly with founders, executives and senior technical stakeholdersTurn ambiguous business problems into clear technical solutionsChallenge requirements and propose better approaches where necessaryHelp shape Avallo's engineering standards, practices and future teamYou will work across a broader range of technologies and business models than you would typically encounter in a single-product company. You will also have direct visibility into how technical decisions affect revenue, operations, customer experience and company value.What You Will BuildOur engagements vary by company and industry. Typical projects include:Customer portals and enterprise web applicationsAI-powered operational workflowsInternal automation and productivity platformsAPI platforms and third-party integrationsPayment and financial technology systemsData and operational management platformsLegacy platform migrations and modernisation programmesThe common thread is impact: the systems we build must perform reliably, solve a meaningful problem and create measurable value.TechnologyWe hire engineers with strong technical judgement rather than narrow framework expertise. Our current stack includes:Frontend: React, Next.js, TypeScript and Tailwind CSSBackend: Node.js, NestJS, TypeScript, Python, REST and GraphQLData: PostgreSQL, Redis and SQL-based data platformsCloud and Infrastructure: AWS, Docker, Terraform, ECS, S3, RDS, CloudFront and GitHub ActionsAI and Automation: OpenAI, Anthropic, document processing, agentic workflows and AI-assisted software developmentOur stack will continue to evolve. We expect senior engineers to help us decide what should change and why.What We Are Looking ForWe are looking for engineers who combine strong technical ability with ownership, pace and commercial judgement.You are likely to succeed at Avallo if you:Have a strong track record of shipping production-grade web applicationsTake responsibility for outcomes, not only assigned tasksWrite clear, maintainable and reliable softwareCan understand unfamiliar codebases and industries quicklyMake pragmatic technical decisions without lowering standardsThink about users, operations and commercial impact alongside implementationCommunicate clearly with both technical and non-technical stakeholdersRemain effective when requirements are incomplete or priorities changeUse AI tools meaningfully to improve the speed and quality of your workAre comfortable operating with autonomy and being accountable for your decisionsYou will ideally have experience with several of the followingTypeScript, Node.js, React and Next.jsNestJS or comparable backend frameworksPostgreSQL, Redis and relational databasesAWS, Docker and TerraformREST APIs and distributed integrationsCI/CD and automated testingEvent-driven architecture and distributed systemsExperience building with LLMs, automation platforms or document-processing systems is a strong advantage.Experience in financial services, fintech, payments or another regulated industry is useful, but not essential.How We OperateAvallo is a growing business with high expectations and limited bureaucracy.You will have meaningful influence over the work, the technology and how the engineering function develops. In return, we expect initiative, sound judgement and a high level of personal ownership.Our operating principles are straightforward:Own the outcome: Take responsibility for the result, not only your part of the implementation.Move with urgency: Make decisions, ship useful software and improve it through real feedback.Protect quality: Speed matters, but reliability, security and client trust matter more.Stay close to the problem: Understand the business context before choosing the technical solution.Use the best tools available: We use AI extensively across engineering and expect the team to keep improving how it is applied.Challenge constructively: Senior engineers are expected to question weak assumptions and raise the standard of the work around them.What We OfferCompetitive base salaryPerformance-related bonusEquity opportunityRemote-first working across the UKFlexible working arrangements25 days of annual leave, plus bank holidaysCompany pensionHigh-quality equipment and modern development toolsAccess to leading AI engineering platformsDirect exposure to founders, CEOs and private equity operating teamsThe opportunity to work across multiple businesses and industriesSignificant autonomy and influence as the engineering team growsWhy Avallo?Most engineering roles place you inside one product, one industry and one roadmap.At Avallo, you will work across businesses at important stages of growth and transformation. You will solve difficult technical problems, work directly with senior decision-makers and see the commercial effect of what you build.You will also join early enough to influence how the engineering organisation develops: its standards, architecture, tooling, hiring and culture.We are building a team for engineers who want more responsibility, more variety and a closer connection between their work and the performance of the businesses they support.If you are technically strong, commercially curious and motivated by ownership, we would like to hear from you.