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August 8, 2026

Senior Tech Lead - C# / .NET

Senior • On-site

Copenhagen, Denmark

One of our clients is looking for a Senior Tech Lead to play a pivotal role within an established platform, overseeing a modernization initiative that includes development of a new mobile application and API. The role blends technical expertise and leadership, with a focus on stabilizing the codebase and making robust technical decisions that drive project success.

Main Responsibilities

  • Lead the technical direction of the modernization initiative from concept through delivery.
  • Conduct a structured technical assessment of the existing codebase and recommend a path forward.
  • Establish development standards and engineering guidelines for team consistency.
  • Identify architectural gaps and define a clear development roadmap.
  • Assess team capabilities and implement necessary delivery practices.
  • Define API contracts, ensuring consistency and secure integration.
  • Uphold coding standards through code reviews and quality improvements.
  • Provide clear guidance to developers, translating architectural principles into actionable decisions.
  • Act as a trusted partner, aligning technical execution with business goals.

Key Requirements

  • Approximately 10 years of professional software development experience.
  • Proven Tech Lead experience responsible for architecture and development standards.
  • Strong expertise in C# and .NET, including both .NET Framework and modern .NET.
  • Experience with PostgreSQL and relational databases, including raw SQL for performance, readability, debugging and troubleshooting.
  • Solid experience with CI/CD pipelines and version control using Git/GitHub, including setting up quality gates.
  • Understanding of testing strategies, including unit and integration tests.
  • Experience establishing architecture standards and engineering practices across a team.
  • Experience designing and implementing API contracts, including required versus optional fields and error-handling standards.
  • Experience using architecture validation tooling, such as NetArchTest or similar.
  • Strong understanding of software design principles, such as SOLID, applied pragmatically in existing codebases.
  • Comfortable using AI-assisted development tools for design, testing, code reviews and refactoring.
  • Experience working in agile development environments, such as Scrum or Kanban.
  • Proficiency with Jira and Confluence for day-to-day collaboration and delivery processes.
  • Fluent Danish and English, with the ability to communicate technical concepts clearly.
  • Strong communication skills, including explaining technical concepts and trade-offs to technical and non-technical stakeholders.

Nice to Have

  • Frontend experience with JavaScript/TypeScript and modern frameworks.

Personal Characteristics

  • Takes ownership and works independently while being proactive and collaborative.
  • Pragmatic and solution-oriented, with a strong focus on delivering value and quality.
  • Demonstrates strong performance and proactivity, creating momentum and moving initiatives forward.
  • Confident making difficult technical decisions and taking responsibility for trade-offs, including recommending a rebuild when necessary.
  • Thrives in complex environments and turns ambiguity into clear direction.
  • Translates technical complexity into clear, actionable insights for developers, stakeholders and leadership.
  • Structured and quality-focused, able to drive execution and maintain high engineering standards.

Assignment Details

  • Start date: ASAP
  • Duration: Until end of year
  • Workload: 100%

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Warsaw, Poland

8,000 - 9,000 USD

🏢 Summary: Hands-on Backend Tech Lead role responsible for driving technical architecture and implementation of a scalable SaaS legal-tech platform on AWS. The position combines active Python/Django development with team leadership, system design, and ownership of backend delivery. You will lead feature development end-to-end while ensuring high standards in scalability, security, and CI/CD practices. 🗂️ Requirements: 10+ years professional software development experience, 3+ years in technical leadership or mentoring role, Expert-level Python 3.10+, Expert-level Django 4.x, Strong REST API development experience, Strong system design and architecture skills, Experience building scalable systems on AWS, Advanced PostgreSQL knowledge, Experience with Redis and Elasticsearch/OpenSearch, Experience deploying and scaling applications with ECS, Lambda, S3, CloudFront, RDS, Strong CI/CD practices knowledge, Infrastructure as Code experience, Strong debugging and problem-solving skills 📃 Skills: Python, Django, REST, AWS, ECS, Lambda, S3, CloudFront, RDS, PostgreSQL, Redis, Elasticsearch, OpenSearch, Terraform, Terragrunt, CI/CD, CloudWatch, Sentry, KMS, SOPS, JWT 🏢 Description: About Us We build B2B legal technology that helps law firms and fund managers work faster and produce higher-quality results. Our product makes the legal processes for raising private investment funds simpler, helping lawyers speed up drafting, negotiations, and compliance. Our platform runs on a single-tenant SaaS system hosted on AWS in multiple regions. It is built using modern technologies: Python/Django, React/TypeScript, PostgreSQL, Redis, Elasticsearch/OpenSearch, S3, ECS, and Lambda. Our teams use Agile Scrum methods and strong practices for CI/CD, Infrastructure as Code (Terraform/Terragrunt), and security. Role Overview We are looking for a Backend Tech Lead to guide one of our engineering teams. This is a hands-on leadership role for a skilled senior backend engineer ready to lead. You will manage the technical direction of your team while still actively coding, designing systems, and solving complex platform and data challenges. You will oversee building features from design to implementation, mentor engineers, promote technical excellence, and encourage a collaborative team culture. You will work closely with Product Managers to ensure your team delivers scalable, maintainable, and high-quality solutions for our clients worldwide. Key Responsibilities Lead technical design, architecture, and implementation of new features. Ensure solutions are scalable, secure, and match the product vision. Mentor backend engineers and support their growth through guidance, code reviews, and career development. Stay hands-on in Python/Django coding and solve complex platform and database issues. Set and enforce best practices for coding, testing, CI/CD, and system design. Work with Product Managers to turn requirements into technical designs and development plans. Manage the team’s technical roadmap and delivery, addressing risks and meeting sprint goals. Facilitate technical discussions, resolve difficult decisions, and make key architectural choices. Improve developer workflows and team productivity with tools and automation. Essential Requirements At least 10 years of professional experience in software development. Minimum 3 years in a leadership or mentoring role. Expert in Python 3.10+ and Django 4.x, including REST API development. Strong system design and architecture skills, with experience building scalable AWS systems. Skilled with PostgreSQL, Redis, and Elasticsearch/OpenSearch. Experience deploying and scaling applications on AWS (ECS, Lambda, S3, CloudFront, RDS). Strong problem-solving and debugging skills across the stack. Preferred Requirements Experience in legal tech, FinTech, or regulated industries. Knowledge of Infrastructure-as-Code (Terraform/Terragrunt) and advanced AWS tools. Familiarity with monitoring tools (CloudWatch, Sentry) and security practices (KMS, SOPS, JWT). Experience leading remote or distributed teams and setting team development standards (testing, linting, pre-commit workflows). Personal Attributes Hands-on leader who enjoys building software and supporting their team. Clear communicator, able to explain technical ideas to technical and non-technical people. Pragmatic decision-maker balancing technical quality and business needs. Strong sense of ownership and accountability for team success and platform health. Proactive problem-solver, adaptable in a growing company. Committed to learning and sharing knowledge with the team. What We Offer Competitive salary. Career growth opportunities in a fast-growing tech company. Remote-first culture with international colleagues. Work with innovative legal-tech solutions and high-profile global clients. This senior role allows you to shape the technical future of our product, working across the stack to deliver features for some of the world’s leading law firms.