CrawlJobs Logo
Tonsser Logo Tonsser · IT - Software Development

Lead Backend Engineer

80000.00 - 90000.00 EUR / Year · Job Posted May 16, 2026
Apply Position
Job Link Share

Job Description

Tonsser is on a mission to redefine youth sports. Hundreds of thousands of young athletes across Europe already use Tonsser to track their performance, get discovered, and feel part of something bigger than the next match. We're now starting our most ambitious chapter yet, a new project that will reshape an entire category, and we're looking for a Lead Backend Engineer to help us build it.

Job Responsibility

  • Lead the architectural direction of our backend platform as we evolve from where we are today toward what's next
  • Drive the technical roadmap for our new flagship project
  • Set the standard for how the team works with AI, both in our development workflow and as a product capability
  • Ship production code, review PRs, and mentor the engineers around you
  • Partner closely with product, mobile, and design to turn ambitious ideas into things that actually work at scale
  • Make pragmatic calls about what to keep, what to evolve, and what to rebuild

Requirements

  • Significant experience as a senior or lead backend engineer, ideally with time spent owning architecture decisions in a production environment
  • Deep comfort with at least one of Ruby, Python, Elixir, Go, or a similar modern backend language, and the judgement to know when language choice matters and when it doesn't
  • Strong opinions on API design, data modelling, and system evolution
  • Hands-on experience integrating AI/LLM capabilities into real products, or a strong, demonstrable interest in doing so
  • Experience leading or mentoring other engineers
  • Comfortable working remotely across European timezones

Nice to have

Experience with consumer-scale mobile backends, GraphQL, or Kotlin Multiplatform

What we offer

Remote work across Europe

Tonsser - All Job Offers

Looking for more opportunities?

Search for other job offers that match your skills and interests.

Suggested Tags: Frontend Developer Secretary Talent Manager Salesforce Administrator Data Analyst
Similar Jobs for

Lead Backend Engineer

8 matching positions

Lead Backend Engineer

We are looking for a highly motivated and experienced Lead Backend Engineer to j...
Location
Location
Salary
Salary:
Not provided
commencis.com Logo
Commencis
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • BS/MS degree in Computer Science, Engineering or a related subject
  • Proven hands-on software engineering experience
  • Strong experience in Java development
  • Strong experience with Spring Framework, preferably Spring Boot
  • Hands-on experience in designing and developing enterprise-grade backend applications
  • Solid understanding of microservice architecture and distributed systems
  • Experience with event-driven architecture and asynchronous integration patterns
  • Strong knowledge of scalable, resilient and high-availability system design
  • Solid understanding of object-oriented analysis and design using common design patterns
  • Experience with RESTful APIs and backend integration patterns
Job Responsibility
Job Responsibility
  • Design, implement, and operate cloud-native AI/ML services that are secure, reliable, and cost-efficient ensuring that they meet the business objectives and adhere to service level agreements (SLA)
  • Deploy and maintain AI applications on cloud- architecture
  • Build retrieval-augmented generation (RAG) stacks: embeddings, vector stores, chunking, and evaluation
  • Create MLOps foundations: experiment tracking, model registry, CI/CD for data & models, and Infrastructure-as-Code
  • Investigate new techniques, tools, and methods that might increase efficiency among engineering & technology and cloud teams, as well as leading execution processes of topics evaluated & planned for roll-out
  • Collaborate with other technical leaders and business stakeholders to align all constraints and come up with solutions regarding project/product/initiative outputs
  • Be accountable for the reliability and security of cloud infrastructure and services
  • Provide visibility of performance, cost, and the security of cloud infrastructure and services
  • Drive continuous improvement, continuous delivery, and lean practices within the cloud team
  • Keep up to date on modern technologies and trends and advocate for their inclusion within products when it makes sense
What we offer
What we offer
  • Competitive salary
  • Private health insurance
  • Pension and retirement plans through a company-backed pension system
  • Meal card
  • Commute compensation
  • Work-from home support
  • Paid birthday off
  • Flexible working hours including remote working option
  • Online events, guest speakers, refreshments in the office, meeting-light culture
  • Support learning and development programs for almost anything
  • Fulltime
Read More
Arrow Right

Lead Backend Engineer

We’re looking for a Lead Backend Engineer to join a fast-growing private equity ...
Location
Location
European Economic Area
Salary
Salary:
Not provided
weareorbis.com Logo
Orbis Consultants
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Strong experience in Python and FastAPI
  • Hands-on with Azure cloud services and infrastructure
  • Background in investment or quantitative systems
  • Comfortable owning and troubleshooting production-grade systems
Job Responsibility
Job Responsibility
  • Build and maintain APIs and backend services in Python and FastAPI
  • Develop and improve deployment pipelines, automation, and monitoring
  • Support trading and investment systems used by quant and private equity teams
  • Take ownership of production systems, ensuring they run smoothly
Read More
Arrow Right

Lead Backend Engineer

Join us as a Lead Backend Engineer -VP at Barclays, where you will spearhead the...
Location
Location
India , Pune
Salary
Salary:
Not provided
barclays.co.uk Logo
Barclays
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Expert level in Java 17 and above
  • Microservices
  • MicroFrontend
  • Angular 15 or above
  • Oracle 19c or above
  • Kafka or any event driven messaging
  • Excellent communication skills with clear and concise technical and business communication
  • Strategic thinking with clear vision to set technical direction
  • Good stakeholder management
Job Responsibility
Job Responsibility
  • Provision of guidance and expertise to engineering teams to ensure alignment with best practices and foster a culture of technical excellence
  • Contribution to strategic planning by aligning technical decisions with business goals, anticipating future technology trends, and providing insights to optimize product roadmaps
  • Design and implementation of complex, scalable, and maintainable software solutions, considering long-term viability and business objectives
  • Mentoring and coaching to junior and mid-level engineers to foster professional growth and knowledge sharing, elevating the overall skillset and capabilities of the organization
  • Collaboration with business partners, product managers, designers, and other stakeholders to translate business requirements into technical solutions and ensure a cohesive approach to product development
  • Innovation within the organization by identifying and incorporating new technologies, methodologies, and industry practices into the engineering process
What we offer
What we offer
  • Competitive holiday allowance
  • Life assurance
  • Private medical care
  • Pension contribution
  • Fulltime
Read More
Arrow Right

Lead Backend Engineer

At cozycozy, we’re building the world’s best accommodation metasearch platform, ...
Location
Location
France , Paris
Salary
Salary:
Not provided
cozycozy.com Logo
cozycozy
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Strong experience with Node.js + TypeScript (Fastify, Express, Yarn, Zod, OpenAPI, Jest)
  • Solid experience with Go (Gin, Zap, code generators) or willingness to deepen your Go skills
  • Deep understanding of databases: MongoDB, PostgreSQL, Redis/Dragonfly and know Functional Programming Principles
  • Strong experience with Docker, Kubernetes, and cloud/bare-metal deployments (Linux, K3s)
  • Experience with queues & event-driven systems (RabbitMQ, Google Pub/Sub, Kafka)
  • Experience building and maintaining REST (OpenAPI, Swagger), gRPC APIs
  • Confidence working on big data pipelines, collaborating with data engineers, and creating scheduled jobs with Airflow or k8s Cronjobs
  • Observability-driven engineer with hands-on experience in Grafana, Prometheus, Loki, and Promtail
Job Responsibility
Job Responsibility
  • Act as the reference engineer for backend topics, supporting the Head of Engineering in driving technical direction
  • Mentor senior and mid-level engineers, helping them grow through guidance on architecture, best practices, and code quality
  • Lead technical discussions, design reviews, and RFC processes
  • Own core backend systems powering millions of real-time accommodation results
  • Design and maintain scalable, low-latency services ingesting large volumes of data from dozens of partners
  • Contribute to key architecture decisions and ensure alignment with long-term platform goals
  • Ensure reliability, performance, and observability across backend components
  • Write high-quality TypeScript/Node.js and Go code while supporting continuous delivery of new features
  • Evolve our APIs (REST, gRPC, OpenAPI) to improve speed and performance
  • Work closely with product, data, and frontend to deliver user-impacting improvements
What we offer
What we offer
  • Competitive salary
  • Stock options
  • Alan health insurance
  • Swile card
Read More
Arrow Right

Lead Backend Engineer

Join the Customer Experience Platform team to help build a world-class Customer ...
Location
Location
United States , San Francisco; Los Angeles; Seattle; New York
Salary
Salary:
195000.00 - 230000.00 USD / Year
whatnot.com Logo
Whatnot
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 5+ years of full-time software engineering experience in high growth startups
  • Bachelor’s degree in Computer Science, a related field, or equivalent work experience
  • Proven track record of building end-to-end product experiences and scaling high-scale backend systems
  • Experience with Python, Elixir, and/or Postgres is a plus
  • Ownership Mindset: Own projects holistically from inception to production and beyond
  • Product Instinct: Excel at translating user needs to effective technical solutions
  • Problem Solving: Thrive in ambiguity and tackle challenging problems with creativity and autonomy
  • Team Leadership: Proactively improve the team environment and foster inclusive, supportive team culture
Job Responsibility
Job Responsibility
  • Build new user-facing experiences
  • Scale internal infrastructure
  • Design intelligent AI-powered automations to help solve thousands of customer issues per hour
  • Lead solutions end to end
  • Translate ambiguous business problems into clear technical solutions and drive delivery and experimentation
  • Balance development speed, product impact, and technical excellence
What we offer
What we offer
  • Generous Holiday and Time off Policy
  • Health Insurance options including Medical, Dental, Vision
  • Work From Home Support
  • Home office setup allowance
  • Monthly allowance for cell phone and internet
  • Care benefits
  • Monthly allowance for wellness
  • Annual allowance towards Childcare
  • Lifetime benefit for family planning, such as adoption or fertility expenses
  • Retirement
  • Fulltime
Read More
Arrow Right

Lead Backend Engineer

At cozycozy, we’re building the world’s best accommodation metasearch platform, ...
Location
Location
France , Paris
Salary
Salary:
Not provided
cozycozy.com Logo
cozycozy
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Strong experience with Node.js + TypeScript (Fastify, Express, Yarn, Zod, OpenAPI, Jest ) monorepo tooling is a plus
  • Solid experience with Go (Gin, Zap, code generators) or willingness to deepen your Go skills
  • Deep understanding of databases: MongoDB, PostgreSQL, Redis/Dragonfly and know Functional Programming Principles
  • Strong experience with Docker, Kubernetes, and cloud/bare-metal deployments (Linux, K3s)
  • Experience with queues & event-driven systems (RabbitMQ, Google Pub/Sub, Kafka)
  • Experience building and maintaining REST (OpenAPI, Swagger), gRPC APIs
  • Confidence working on big data pipelines, collaborating with data engineers, and creating scheduled jobs with Airflow or k8s Cronjobs
  • Observability-driven engineer with hands-on experience in Grafana, Prometheus, Loki, and Promtail, and a mindset focused on continuously improving monitoring and insights
Job Responsibility
Job Responsibility
  • Act as the reference engineer for backend topics, supporting the Head of Engineering in driving technical direction
  • Mentor senior and mid-level engineers, helping them grow through guidance on architecture, best practices, and code quality
  • Lead technical discussions, design reviews, and RFC processes
  • Own core backend systems powering millions of real-time accommodation results
  • Design and maintain scalable, low-latency services ingesting large volumes of data from dozens of partners
  • Contribute to key architecture decisions and ensure alignment with long-term platform goals
  • Ensure reliability, performance, and observability across backend components
  • Write high-quality TypeScript/Node.js and Go code while supporting continuous delivery of new features
  • Evolve our APIs (REST, gRPC, OpenAPI) to improve speed and performance
  • Work closely with product, data, and frontend to deliver user-impacting improvements
What we offer
What we offer
  • Competitive salary
  • stock options
  • Alan health insurance
  • Swile card
Read More
Arrow Right

Lead Backend Engineer

Help bring AI agents to companies worldwide. Over the next decade, autonomous ag...
Location
Location
Canada , Montreal
Salary
Salary:
Not provided
botpress.com Logo
Botpress Technologies Inc.
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 5+ years of experience with high-scale SaaS platforms, developer tools, and/or AI-driven products
  • Deep expertise in JavaScript/TypeScript, Nodejs, and operating backend systems in production
  • You’ve led technical projects end-to-end and enjoy taking ownership
  • Strong understanding of APIs, databases, distributed systems, and cloud infrastructure
  • Comfortable balancing speed and quality in a fast-moving environment
  • You write clean, maintainable code and care about long-term system health
  • You enjoy mentoring teammates and setting a high engineering bar
  • You thrive in collaborative teams where engineering and product work closely together
Job Responsibility
Job Responsibility
  • Lead the design and development of backend services and APIs that support mission-critical product features
  • Own architecture decisions around scalability, reliability, and performance
  • Collaborate closely with product, frontend, and platform teams to deliver end-to-end solutions
  • Build and maintain distributed systems, databases, and internal tooling
  • Establish strong engineering practices around code quality, testing, observability, and deployment
  • Mentor and support other engineers through technical guidance and review
  • Drive improvements in system performance, security, and infrastructure efficiency
  • Help define backend technical strategy as the company scales
What we offer
What we offer
  • Work at one of Canada’s fastest-growing AI start-ups
  • Work with a talented and passionate team
  • 4 weeks of vacation
  • Paid sick and parental leave
  • Comprehensive health, dental, vision, travel, and life insurance
  • Funding for education and skills improvement
  • Fully-stocked fridge and cupboard – we take snacks seriously
  • Your own desk – no ‘hot-desk’-style sign-up systems
  • A vibrant office community, including weekly socials
  • Fulltime
Read More
Arrow Right

Lead Backend Engineer

An established, global technology business within the hospitality-tech industry ...
Location
Location
United Kingdom , London
Salary
Salary:
95000.00 - 120000.00 GBP / Year
socialvalueportal.com Logo
Social Value Portal Ltd
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Degree in Computer Science or equivalent hands-on experience
  • 7+ years' experience in backend software development, including several years in a senior or principal-level engineering role
  • Expertise in Python (or a similar backend language), with proven experience designing distributed systems, APIs, and microservices at scale
  • Deep understanding of software architecture, cloud infrastructure (Google Cloud, AWS, or Azure), and modern DevOps practices
  • Strong knowledge of data structures, algorithms, and system design principles
  • Demonstrated experience influencing technical direction across teams and driving alignment on complex engineering decisions
  • Passion for delivering elegant, high-performance software and solving complex technical challenges that impact real users
Job Responsibility
Job Responsibility
  • Lead the technical vision and architectural direction across complex backend systems, ensuring scalability, reliability, and performance
  • Partner closely with engineering leadership to define best practices, coding standards, and long-term technical strategy
  • Design, develop, and oversee the delivery of robust, production-grade software built using Python, Django, Cloud Firestore, BigQuery, and Elasticsearch
  • Mentor and guide engineers at all levels, fostering a culture of technical excellence and continuous improvement
  • Collaborate with cross-functional teams - including product, data, and design - to deliver innovative solutions that directly impact customer success
  • Evaluate and implement emerging technologies that enhance system performance and developer productivity
  • Take ownership of mission-critical initiatives, balancing technical depth with business priorities to deliver scalable, maintainable solutions
What we offer
What we offer
  • RSU's
  • Fulltime
Read More
Arrow Right