Bulgaria is digitizing its procurement law: The SIGMA platform and the long road to transparency in public procurement

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Published on: July 15, 2026 / Updated on: July 15, 2026 – Author: Konrad Wolfenstein

Bulgaria is digitizing its procurement law: The SIGMA platform and the long road to transparency in public procurement – Image: Xpert.Digital

51 billion euros revealed: How Bulgaria is fighting the swamp of corruption with AI

The end of secret contracts? This new platform reveals where Bulgarian taxpayers' money goes

Programmed in just one month: The ingenious tech move against billions in corruption – SIGMA makes 193,019 contract awards and 51 billion euros publicly visible

For decades, Bulgaria's public procurement system was considered an impenetrable jungle, where billions of euros in taxpayer money disappeared annually. Now, as the undisputed worst performer in the EU Corruption Perceptions Index, the country is attempting a radical overhaul: with the new open-source platform "SIGMA," the government is making over 190,000 procurement contracts, worth more than €51 billion, freely accessible to every citizen, journalist, and businessperson. Developed in record time and with the help of artificial intelligence, the system is intended to be far more than just a digital showcase. It marks the beginning of an ambitious five-stage plan designed to serve as a proactive warning system against price fixing, sham competition, and the squandering of public resources. But can a digital tool alone dismantle deeply entrenched kleptocratic networks? This analysis examines transparency as a political weapon, the successful example of Ukraine, and the pressing question of whether Bulgaria's initiative represents a genuine turning point or merely a short-lived political promise.

How a data leak exposes the state – and why 51 billion euros were hidden in the dark

When transparency becomes a weapon: The political moment behind SIGMA

On June 16, 2026, Bulgarian Prime Minister Rumen Radev, together with Innovation Minister Ivan Vassilev, addressed the press and presented a digital tool to the Council of Ministers in Sofia that is striking in its simplicity: a freely accessible website that reveals where Bulgarian taxpayers' money is going. The name of this platform – SIGMA, the mathematical symbol for sum – was chosen programmatically. SIGMA stands for the Integrated Citizen Monitoring and Analysis System, and it compiles data on 193,019 procurement contracts concluded between 2020 and 2026 by 4,440 state and municipal institutions with 17,449 companies, with a total volume exceeding €51 billion.

What's remarkable is not just the wealth of data, but the speed and circumstances of its creation. The Ministry of Innovation and Digital Transformation (MIDT) developed the platform in less than a month, without additional budget funds, using artificial intelligence tools and in collaboration with the procurement agency and the state-owned company "Information Service." The source code was made available under a public license on the government's GitHub profile on the very day of its release. This is not a mere technical detail—it's a political commitment to openness in a country that has long been unfamiliar with it.

Radev himself spoke of a "beginning of genuine transparency in public finances" and emphasized that effective anti-corruption measures are impossible without access to information. The SIGMA platform is the first visible digital output of the newly established ministry (founded in May 2026) and part of a declared government program that understands transparency as a tool for restoring institutional trust. This context is crucial: SIGMA did not arise from a purely technical impulse, but from a deep political unease with a procurement culture characterized by decades of opacity.

The swamp of corruption: What the figures reveal about Bulgarian public procurement

To properly understand SIGMA, one must grasp the problem it aims to solve. Bulgaria ranks last in the European Union in Transparency International's 2025 Corruption Perceptions Index, scoring 40 out of a possible 100 points, tied with Hungary, and far below the EU average of 62 points. This is not only the worst score since 2012, but also a decline of five points in just two years – a statistically significant drop that Transparency International attributes to the lack of decisive action against kleptocratic networks, a paralyzing political crisis, and the dissolution of the anti-corruption agency.

These abstract indices have very real fiscal consequences. Experts from the European Commission and independent research institutes estimate the corruption surcharge in public procurement at around 8 to 9 percent of the contract value. With a contract portfolio of 51 billion euros over six years, this translates to potential damages of over 4 billion euros. This figure is not political rhetoric, but a sober economic calculation of the extent of resource waste and misallocation.

The data from the EU Single Market Scoreboard are particularly revealing. According to this data, in 2024, 36 percent of all public contracts in Bulgaria were awarded to a single bidder – compared to an EU average of 28 percent. Equally worrying: 20 percent of contracts were awarded without any tendering process, while the EU average is just 5 percent. The European Commission considers a rate of over 20 percent for single-bidder contracts as an indicator of an insufficiently competitive market. At 36 percent, Bulgaria significantly exceeds this threshold. At the municipal level, the figures are even more drastic: in certain municipalities, up to 58 percent of all tenders were awarded to only one candidate, and almost 65 percent of municipal funds were channeled through such procedures.

Furthermore, 85 percent of contract awards are based solely on the lowest bid – almost double the EU average of 54 percent. While this might initially sound like fiscal thrift, the opposite is true: systematically ignoring quality criteria encourages strategically low bids, which are then inflated through supplementary agreements – a pattern that SIGMA is designed to automatically identify in future versions. In 2025 alone, the European Public Prosecutor's Office (EPPO) opened 82 new investigations into alleged fraud involving EU funds in Bulgaria, with an estimated potential loss of €702 million. At the end of 2025, a total of 267 active EPPO cases were pending in Bulgaria, with a total loss of approximately €1.13 billion.

How SIGMA works: Architecture of a transparency tool

In its initial version, SIGMA is a data display and search system, not an active control tool. The platform retrieves its data daily directly from the official Bulgarian procurement register (CAIS EOP/AOP) and presents it in a user-friendly interface. Any citizen, journalist, or NGO can search for institutions, companies, tax identification numbers, keywords, or contract numbers free of charge and without registration.

For each contract, the financial history is disclosed: the estimated value at the time of tendering, the agreed value at contract signing, and the current value after any amendments. This three-part format offers significant analytical value, as systematic discrepancies between initial and final values are a classic pattern of corruption through subsequent price increases. Users can also see whether procedures were competitive or whether only a single bidder participated – a direct indicator of tailor-made tenders.

The decision to pursue fully open-source development and public data in CSV format is strategically sound. The Ministry explicitly invites startups, developers, data analysts, journalists, and universities to develop their own analysis tools, visualizations, and warning systems based on the SIGMA infrastructure. In doing so, Bulgaria is following a model known from other countries that is significantly more effective than a purely state-run surveillance system: the democratization of data control.

The technical development using AI tools in less than a month is remarkable, but should be viewed with a critical eye. What emerges in just a few weeks is necessarily a first, simplified version. Critical functions—such as linking to the commercial register to identify related parties, automatically detecting price gouging, or monitoring the tendering processes themselves—are planned for later versions. The system's true strength will only become apparent in versions 2 through 5, which are intended to provide a significantly more complex data picture.

A five-step roadmap: From inventory to proactive risk identification

The ambition behind SIGMA extends far beyond the initial version. Minister Vassilev has publicly communicated a roadmap with five development stages, outlining how the system will gradually evolve from a passive data indicator to an active control mechanism.

Version 1 – the current version – forms the basis: complete data collection of all procurement contracts from 2020 to 2026, freely accessible and updated daily. Version 2 will integrate the commercial register, enabling the identification of connections between bidders, subcontractors, and contracting authorities – the core of any serious conflict of interest analysis. Version 3 will focus on monitoring the procurement process itself: whether tender documents are formulated in such a way that they are de facto open only to a specific supplier – a common method for manipulating formally correct procedures.

Version 4 plans to use AI-supported price analysis: The system will automatically identify procedures where submitted bids are significantly above market prices – an early warning system against public asset losses due to overpriced contracts. Version 5 is deliberately left open and is intended to be continuously developed as a living system. This evolutionary architecture is appropriate: Rigid systems fail due to their own inflexibility when workarounds adapt.

The effectiveness of this roadmap will hinge on whether it can be politically anchored beyond changes of government. Bulgaria's recent political history—multiple changes of government, the dissolution of the anti-corruption agency, and annulled elections—warns caution. Technical systems can quickly be discontinued or politically blocked if the will to use them wanes. SIGMA, in its current form, is more promise than reality—an ambitious promise, but one that has yet to be fulfilled.

The Prozorro model: What Bulgaria can learn from Ukraine

Bulgaria is not the first country to embrace open-source transparency in public procurement. The most striking example comes from a country at war: Prozorro, the Ukrainian digital procurement system developed by a group of civil society activists and data experts after the 2014 Maidan Revolution, is now internationally recognized as a prime example of the transformative power of digital transparency.

The parallels to SIGMA are striking: open-source architecture, citizen accessibility, an evolutionary development model, and the explicit involvement of civil society. The differences lie in the scale of the change achieved. After a decade, Prozorro has saved more than US$8.7 billion in public funds, including 17 billion hryvnia in the defense sector alone. The number of companies participating in government tenders increased from 14,000 in 2014 to 140,000 in 2024. The specialized Prozorro Market module achieved savings of 15 to 20 percent compared to direct procurement. In 2024, over 3.6 million tender processes were handled through the system.

These figures were not achieved in a few months, but over a decade – through consistent institutional integration, capacity building, legislative reforms, and use by an active civil society. Prozorro survived the Covid pandemic and the Russian war of aggression because it does not depend solely on state goodwill, but is anchored in an ecosystem of state, private, and civil society actors. This aspect – the ecosystem – is what is truly transferable for Bulgaria, not the technology alone.

The challenge lies in the fact that, unlike Ukraine, Bulgaria has not experienced a comparable shock reaction from civil society that acted as fuel for radical reforms. The political window for the current Radev government is narrow and marked by recent instability. The question is not whether SIGMA works technically, but whether the social and institutional energy is present to make it a genuine instrument of control.

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Digital procurement as a growth engine: Why SIGMA is more than a transparency tool

Economic implications: What transparency means for investment and growth

From sham competitors to genuine competition: Can SIGMA expose manipulated tenders?

The introduction of SIGMA has far-reaching economic implications beyond its direct anti-corruption effect. Bulgaria joined the Eurozone on January 1, 2026 – a historic step that ushers the country into a new phase of macroeconomic stability, but also raises high expectations for institutional reliability. The European Commission forecasts GDP growth of 2.5 percent for 2026, following 3.1 percent the previous year. The EBRD expects 2.7 percent, supported by continued RRF-driven investment and improved investor confidence following Eurozone accession.

These growth forecasts, however, are fraught with fiscal risks. The government deficit is expected to exceed 4 percent of GDP in 2026 – driven by social spending, public sector wage increases, and defense expenditures. At the same time, the EU is threatening to demand the repayment of €143 million from the recovery plan after the Bulgarian parliament dissolved its anti-corruption agency. In this strained fiscal environment, the effectiveness of public investment is not an abstract question of efficiency, but a direct budgetary issue: if 8 to 9 percent of procurement funds are lost to corruption surcharges, this equates to billions of euros in annual fiscal damage – funds that the state desperately needs for infrastructure, education, and healthcare.

For foreign investors, the quality of public procurement is a direct indicator of the investment climate. Companies that want to participate in government contracts or supply goods in Bulgaria factor in transaction costs stemming from legal uncertainty, lack of transparency, and unequal market access. If SIGMA actually contributes to making tenders more competitive and exposing manipulated procedures, this will improve market conditions for legitimate suppliers – including foreign companies and SMEs that have previously been excluded from many procedures due to structural disadvantages.

In the context of the Digital Single Market, the open-source strategy is also economically sound. By making its platform available as a core technology, the state creates public infrastructure value upon which private companies, NGOs, and startups can build their own products. This aligns with the model of public data as a raw material for value creation—a model that has already demonstrated in countries like Estonia, Denmark, and the Netherlands how government data transparency can catalyze innovation.

Bulgaria's digital ambitions in European comparison

Despite joining the Eurozone and having some flagship projects like SIGMA, Bulgaria continues to rank near the bottom in the EU's digitalization rankings. Studies using the updated DESI methodology show remarkable stability at the top for 2025 – Denmark, Finland, the Netherlands, and Sweden – while Bulgaria, along with Romania, remains a persistent laggard. Bulgaria's national digitalization roadmap comprises 60 measures with a total budget of €2.19 billion, equivalent to 2.11 percent of GDP. Of these, 48 percent are slated for completion by the end of 2026, with a corresponding allocation of €597 million.

These resources are considerable, and their efficient use depends directly on the quality of public procurement – a circular argument that underscores the strategic importance of SIGMA: An instrument for the transparency of digitalization funding allocation is itself part of the digitalization strategy. If funding for digital transformation is not allocated transparently and competitively, it slows down precisely the transformation it is intended to accelerate.

In its 2026 country report, the Commission emphasizes that despite good progress in fiber optic infrastructure and connectivity, Bulgaria still faces significant challenges regarding digital skills, the digitization of SMEs, and the capacity to adopt advanced technologies. These are weaknesses that cannot be addressed solely through improved procurement platforms – but a procurement policy that fosters competitive markets is a necessary, though not sufficient, condition for catching up technologically.

The structural limits of transparency alone

A sober economic analysis cannot simply celebrate SIGMA as an unqualified advancement. There are substantial limits to the effectiveness of a purely transparency-based instrument, limits that are often overlooked when technological solutions to institutional problems are touted.

Transparency only changes behavior when it has consequences. A platform that reveals 30 percent of contracts were awarded without genuine competition will only have an impact if this information is picked up and processed by law enforcement agencies, regulatory bodies, journalists, and courts. In Bulgaria, this very institutional chain is historically weak. The EPPO statistics for 2025 show: 267 active cases, 82 new investigations, but only 3 legally binding convictions. This ratio of investigation to conviction makes it clear that the problem is not primarily a lack of information, but rather a lack of institutional capacity to act.

The dissolution of Bulgaria's anti-corruption agency has exacerbated this problem. If a new platform makes procurement data visible, but no authority exists with the mandate and resources to consistently monitor this data, SIGMA ultimately remains a medium of public shaming, not an instrument of law enforcement. Public shaming can be effective under certain conditions—for example, if an active civil society and free media seize upon the findings and generate political pressure. Whether Bulgaria possesses these capacities to a sufficient degree is an open empirical question.

Added to this is the problem of strategic adaptation. If corrupt actors know that single-bidder procedures are recognized as a warning sign, they can simply switch to including sham competitors in tenders—companies that formally bid but do not intend to win. This is a well-known pattern in countries that have introduced transparency without simultaneously strengthening procurement oversight. SIGMA versions 3 and 4 target precisely this dimension—but the ability to algorithmically identify sham competition is considerably more complex than simply counting bidders.

Between reform momentum and institutional inertia: A preliminary assessment

The introduction of SIGMA is a genuine and significant step forward – but it is nothing more and nothing less than that: a beginning. The real test lies in whether the political energy that led to its creation is sufficient to take the far more difficult next steps: establishing a reliable link to the commercial register, implementing automated risk indices, and creating an authority that can also take legal action based on the platform's findings.

Bulgaria's macroeconomic situation offers a real window for reform. Economic growth of 3.1 percent in 2025 – driven by domestic demand, wage growth, and EU fund investments – creates fiscal leeway. Eurozone membership increases institutional pressure to comply with regulations. The new Radev government, which launched SIGMA in its first month in office, has thus set a benchmark by which it will be judged. This is politically risky, but also an opportunity: Visible, rapid results can build trust – and trust is scarcer than public funds in Bulgaria.

In the long run, the crucial economic question is not whether SIGMA works technically, but whether it becomes part of a broader package of reforms that strengthens institutional capacities. Digital transparency tools are necessary, but not sufficient, conditions for good governance. Ukraine demonstrates what is possible when such tools are embedded in a stable institutional ecosystem and anchored beyond political changes. With SIGMA, Bulgaria has taken the first step on a long road—a road where the first steps are the easiest, and the later ones the most crucial.

The course for the future of Bulgarian public procurement is being set right now. The 51 billion euros that SIGMA has revealed are not just a number – they represent a public economic cycle whose efficiency, fairness, and effectiveness have a direct impact on the well-being of the Bulgarian people. A platform alone cannot fix this cycle. But it can make it transparent – and thus create the foundation for others, both individuals and institutions, to begin asking the right questions. This is more than has been achieved in recent years.

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